Opencv Save Image

cvtColor does the trick for correcting the colour when converting between PIL and OpenCV Image formats via NumPy. 構造体 CvGraph は,OpenCVで使用されるグラフの基本構造である. グラフ構造体は,CvSet(一般的なグラフの特性とグラフ頂点を記述)を継承し, さらにメンバーとしてもう一つのセット(グラフの辺を記述)を含んでいる.. shape to get the dimension. JPG Public Domain | Link A lot of openCV based programs depend on blob detection for extracting r OpenCV: Build a simple OpenCV program using CMake in Ubuntu Building on our progress with usage of OpenCV, a demo on how to build and run a C++ based OpenCV program is described below. 3 pre-built library install. The script will detect faces in the image and save each face to a folder. a source image (image) a destination image (gray_image), in which we will save the converted image. For instance, one may click the picture of a book from various angles. OpenCV is a computer vision and machine learning programming library that incorporates numerous basic picture examination calculations that will enable us to manufacture custom, intelligent computer. In previous steps we set up camera features parameters using widgets. If you use single-channel image. Mat - The Basic Image Container. NET wrapper to the OpenCV image processing library. imread() andcv2. com/public/qlqub/q15. This tutorial is a machine learning based approach where we use the cv2 module from the OpenCV library in the program. For some weird reason OpenCV is unable to save a CV_32FC1 type cv::Mat into a tiff. OpenCV is a free open source library used in real-time image processing. If you are a software developer with a basic understanding of computer vision and image processing and want to develop interesting computer vision applications with OpenCV, Learn OpenCV 4 by Building Projects for you. 10) and should work on other platforms as well. Published by SuperDataScience Team. OpenCV & Python – Disegnare figure e testi sopra le immagini – Drawing shapes and text on images. The approximate shape of the text in the above example is (268, 36). Processing Forum Recent Topics. 3 Using OpenCV with Eclipse (plugin CDT) 11 1. imwrite('res. Using OpenCV to input a video file and to read each frame then save it to a image. Note: Please observe that the dimensions of the resulting image are provided same as that of the original image. Cheat sheets and many video examples and tutorials step by step. jpg Save the image inside your project location. Image data and operations. In here, we have read the image by passing the flag IMREAD_GRAYSCALE along with the String holding the path of a colored image. Read, Write and Display a video using OpenCV ( C++/ Python ) the next step we would want to do is to save the video. Supported formats are in the OpenCV docs, but jpgs etc are supported. After that, the pictures can be used for identification. Image Manipulation¶ Most image processing and manipulation techniques can be carried out effectively using two libraries: Python Imaging Library (PIL) and Open Source Computer Vision (OpenCV). Open Source Computer Vision Library. EmguCV is written in C#. Image Processing with Python Desert Py Meetup baseim. # The conversion from PIL to OpenCV is done with the handy NumPy method "numpy. For an introduction to using SoftwareBitmap, see Create, edit, and save bitmap images. imwrite() to read (load) and write (save) image files with Python, OpenCV. High resolution - single frame (openCV) # 2. In this introductory tutorial, you'll learn how to simply segment an object from an image based on color in Python using OpenCV. imread() Store all the images into a list. If the source image is an RGB, it loads the image into array with Red, Green and Blue channels. The component implements private methods that get a pointer to the underlying image data buffer which can be used directly by the OpenCV library, making it simple to extend the helper component to implement other OpenCV processing features. This is the second article of the article series which provide answers to following question! How to call OpenCV functions from C#. On MacOSX, there is also an option to use native MacOSX image readers. 4 (pre-compiled, 'pip' from Python Wheels) Picamera 1. OpenCV 3 is a native cross-platform C++ Library for computer vision, machine learning, and image processing. Mat cv::imread ( const String & filename, int flags = IMREAD_COLOR ) // Read image. Python Image Processing With OpenCV There are many image processing packages for Python. a source image (image) a destination image (gray_image), in which we will save the converted image. We make this tutorial very easy to learn. Stream and save video in Python with OpenCV. In this blog, we will do a small project using OpenCV-Python where we will be creating video from image sequences. image - a numpy array of shape (rows, columns, 3). Matlab provides a MEX environment in order to write C functions instead of M-files. image restoration opencv free download. This code just take a Input image and resized save to output Mat. This is a short tutorial about using Tkinter, the default Python GUI library, with OpenCV. As an example, we will create camcv, a soft strongly inspired from raspistill. This is the second article of the article series which provide answers to following question! How to call OpenCV functions from C#. Does the prebuilt image have the latest OpenCV feature set and bug fixes? 2. swap height with width and width with height. As these are pre-trained in OpenCV, their learned knowledge files also come bundled with OpenCV opencv/data/. For instance, one may click the picture of a book from various angles. Note the Location of the image is: C:\Users\arjun\Desktop\a. In this tutorial, we shall the syntax of cv2. Below are a few instances that show the diversity of camera angle. Here is my question : I want to convert a jpg file tp png. As we have been covering in previous tutorials, OpenCV allows us to read and manipulate images, amongst many other features. OpenCV allows you to save the image in different formats. The image windows are closed at the end of the program. The Mat class of OpenCV library is used to store the. Simple real time processing of your own code. But Matplotlib displays in RGB mode. On success of writing the file to the harddisk, it will return true. Both of these classifiers process images in gray scales, basically because we don't need color information to decide if a picture has a face or not (we'll talk more about this later on). After save, this code ensures the image is video frame is displayed with a rectangle on the individual‘s face after face detection. Please see the exercises for more details. In this case we use COLOR_BGR2GRAY (because of cv::imread has BGR default channel order in case of color images). In this blog, we will do a small project using OpenCV-Python where we will be creating video from image sequences. rec files and raw image files. Applied threshold (simple binary threshold, with a handpicked value of 150 as the threshold value) 3. Therefore, when we display an image loaded in OpenCV using matplotlib functions, we may want to convert it into RGB mode. MATLAB provides integration with OpenCV through the OpenCV C++ API. This project tries to solve the problem of processing big data of images on Apache Hadoop using Hadoop Image Processing Interface (HIPI) for storing and efficient distributed processing, combined with OpenCV, an open source library of rich image processing algorithms. 7 and OpenCV 2. Image transformation techniques like color spaces, affine and perspective transforms. Session 7: OpenCV Pixel and Area Manipulation. As we know it is lot easier for OpenCV to work with grayscale images than with colored images since the BGR values can be ignored. cvtColor does the trick for correcting the colour when converting between PIL and OpenCV Image formats via NumPy. This tutorial is a machine learning based approach where we use the cv2 module from the OpenCV library in the program. The guide is based on the official OpenCV Installation Guide on Debian and Ubuntu. Net wrapper to the OpenCV image processing library. Completeness (implement as much as possible, even if speed-up is not fantastic; such allows to run an algorithm entirely on GPU and save on coping overheads) Performance. In this example, we have read an image and used ndarray. Does the prebuilt image have the latest OpenCV feature set and bug fixes? 2. In this way, future consumers will know whether the image they receive is RGB or BGR. Simple number of column (width) and rows (height). There is a difference in pixel ordering in OpenCV and Matplotlib. In every case what we (humans) see are images. text taken from [3]. We can show any format of image in opencv like JPG and PNG. It helps in reducing the number of pixels from an image and that has several advantages e. Opencv tutorial, Read all images withim a folder (Windows) and Labeled Data Load all pictures inside the Folder into Opencv Mat Share this for more tutorials and computer vision post from me. Let’s capture a video from the camera (I am using the in-built webcam of my laptop), convert it into grayscale video and display it. OpenCV GPU module is written using CUDA, therefore it benefits from the CUDA ecosystem. conda install linux-64 v4. OpenCV is a (C++)-based library written primarily for Computer Vision and its related areas. If the source image is an RGB, it loads the image into array with Red, Green and Blue channels. x in a way different from the example I…. I'm using OpenCV to capture RGB-D image with OpenNI. In this chapter, we'll learn how to load an image using imread(). Before you start, make sure you have librealsense and OpenCV installed and working properly on your system. NET wrapper to the OpenCV image processing library. cornerHarris(image, blockSize, ksize, k) This function takes four arguments. Images are read as NumPy array ndarray. Explain how OpenCV images are stored in NumPy arrays. OpenCV is a software package primarily focused on advanced image processing and display troubleshooting. To resize an image, OpenCV provides cv2. All Forums. When working with OpenCV Python, images are stored in numpy ndarray. In OpenCV, this kind of edge detection has already been implemented and is activated by calling the cv2. We are going to do a for loop which will save every box the program will find. In this tutorial, we will learn how to select a bounding box or a rectangular region of interest (ROI) in an image in OpenCV. The Mat class of OpenCV library is used to store the. jpg’) my_img. Often, we have to capture live stream with camera. The most comprehensive image search on the web. Opencv tutorial, Read all images withim a folder (Windows) and Labeled Data Load all pictures inside the Folder into Opencv Mat Share this for more tutorials and computer vision post from me. 東芝 toshiba lekt407403pw-ls9ledベースライト tenqooシリーズ 直付形 w70,ステンレス/生地 キャップボルト (半ねじ)M8×135 【 小箱 : 1箱/50本入り 】,アルファ 南京錠 #1000 l/s 吊長 鍵違い 50 キー3本付き 12個パック. destroyAllWindows() Save image file with python, OpenCV and NumPY packages on PYCharm. imwrite() function to save images. This video will show you how to read, display and save an image using open cv library. how to change src files. For example, Image. Primarily, we will be using OpenCV to read in images for training and testing networks with TensorFlow. Image Bitwise operations. 关于印刷文字识别依然是图像领域的难点问题,还有很多的单位或个人希望拥有自己的语言识别模型。近来,在各大论坛、学习交流群、后台私信等还会看到仍然有同种志群的人才再不断的加入这个领域。. Unity is the ultimate game development platform. Sat Mar 09, 2013 7:20 pm. We are going to do a for loop which will save every box the program will find. png Python – Write Text at the center of the image. Draw on an image with OpenCV. Nearest Neighbour interpolation is the simplest way of interpolation. Gray Scale Image conversion. If at any point you're stuck/lost/whatever, feel free to ask questions on the video and. RGB to GrayScale Conversion OpenCV code; Capturing a video form a file or webcam in opencv Reason for increase in the size of image as i save OpenCV-Image Loading and Saving it using imwrite; OpenCv Vs Matlab : Which is best for image process. 4) Steps to reproduce. 1 Download OpenCV binaries Load, modify, display, and save videos Nate Kent nkent@iastate. If the source image is ARGB, it loads the image with three color components along with the alpha or transparency channel. imwrite() function to save images. When you use the Save method to save a graphic image as a Windows Metafile Format (WMF) or Enhanced Metafile Format (EMF) file, the resulting file is saved as a Portable Network Graphics (PNG) file. rec files, use path_imgrec parameter and to load from raw image files, use path_imglist and path_root parameters. Text Extraction From Image Using Opencv Python Github. We can load any image file in Opencv C++, python or android. 構造体 CvGraph は,OpenCVで使用されるグラフの基本構造である. グラフ構造体は,CvSet(一般的なグラフの特性とグラフ頂点を記述)を継承し, さらにメンバーとしてもう一つのセット(グラフの辺を記述)を含んでいる.. OpenCV 3 image and video processing with Python OpenCV 3 with Python Image - OpenCV BGR : Matplotlib RGB Basic image operations - pixel access iPython - Signal Processing with NumPy Signal Processing with NumPy I - FFT and DFT for sine, square waves, unitpulse, and random signal Signal Processing with NumPy II - Image Fourier Transform : FFT & DFT. That is, the live video feed comes in, one frame at a time, you find the 2D image (of the OpenCV chessboard image), determine its pose, render the 3D object on it, and then save that frame to a video stream object in OpenCV. OpenCV gives the flexibility to capture image directly from a pre-recorded video stream, camera input feed, or a directory path. On Line 3 we load the image into a variable. Image, image analysis, openCV, text. To understand this tutorial better, please refer to Load & Display Image and Play Video from File or Camera first. Conversion between any/all of BGR, RGB, and GBR may be necessary when working with. Capture Video from Camera¶. how to change src files. OpenCV: Read Load and Save Image - Sample Program - Part 2. If you haven’t yet installed OpenCV, you can check here how to do it. Image Manipulation¶ Most image processing and manipulation techniques can be carried out effectively using two libraries: Python Imaging Library (PIL) and Open Source Computer Vision (OpenCV). Using OpenCV to input a video file and to read each frame then save it to a image file with a Python script. The image windows are closed at the end of the program. If the source image is ARGB, it loads the image with three color components along with the alpha or transparency channel. what happened was, when importing and setting up the library project, eclipse automatically changed to C/C++ perspective. Mat cv::imread ( const String & filename, int flags = IMREAD_COLOR ) // Read image. We will use OpenCV to perform various type of image operations. An example of this would be one of the. For images, it is very simple, just use cv2. Many of you may think about how to take videos from webcam and save it in the directory using Python programming skill. png format, using imwrite() function whose first argument takes the image file name and second argument is the image object. Actually i am inserting the BGRA overlay google onto the Video , in my case openCV returns BGRA Image to process, As a result after you code runs the red Overlay image becomes blue, Actually i am very new to OpenCV and after doing doing lot of changes could not figure our what exactly should i do to make it work correctly. Similarly, we are making multiple passes over the background image. Display live video from webcam or file by using HighGUI functions. We have multiple ways to acquire digital images from the real world: digital cameras, scanners, computed tomography, and magnetic resonance imaging to name a few. Python OpenCV cv2 Resize Image; Python OpenCV Read Image - cv2 imread() Python OpenCV cv2. These devices record numerical values of the image (Ex: pixel values). Bitmap to OpenCV and get a resultant image as System. 关于印刷文字识别依然是图像领域的难点问题,还有很多的单位或个人希望拥有自己的语言识别模型。近来,在各大论坛、学习交流群、后台私信等还会看到仍然有同种志群的人才再不断的加入这个领域。. This project tries to solve the problem of processing big data of images on Apache Hadoop using Hadoop Image Processing Interface (HIPI) for storing and efficient distributed processing, combined with OpenCV, an open source library of rich image processing algorithms. Specially this article describes, how to pass System. For color image, opencv uses a three dimensional array to store intensity of Blue, Red, and Green. Search for: Skip to content. OpenCV & Python - Caricare, visualizzare e salvare le immagini su Raspberry OpenCV and Python - Load, view and save images on Raspberry. Choose from a set of image processing operators which are directly adapted from the samples distributed with latest OpenCV package. In this tutorial, we shall the syntax of cv2. You may have to find the shape of your specific. You don't have to launch this cell once more to try the same procedure with the image, just change wanted values and push the button. However there are questions I want to be clarified: 1. If you use single-channel image. (September, 2008). In this way, future consumers will know whether the image they receive is RGB or BGR. As in the case of an image, we use the waitKey() after imshow() function to pause each frame in the video. How big is the resized image is based on the Size. NET languages such as C#, VB, VC++. OpenCV is a software package primarily focused on advanced image processing and display troubleshooting. In this tutorial, you will learn how you can process images in Python using the OpenCV library. But they are being saved by default into the local folder. Python Image Processing With OpenCV There are many image processing packages for Python. In this blog, we will do a small project using OpenCV-Python where we will be creating video from image sequences. 10) and should work on other platforms as well. php(143) : runtime-created function(1) : eval()'d. imwrite() returns a boolean value. Fiverr freelancer will provide Data Analysis & Reports services and do computer vision projects with python opencv tensorflow including Include Source Code within 3 days. So you should be able to use cv_image objects with many of the image processing functions in dlib as well as the GUI tools for displaying images on the screen. The OpenCV library makes it fairly easy to detect a frontal face in an image using its Haar Cascade Face Detector (also known as the Viola-Jones method). High resolution - multiple frames at a given rate (openCV) # 3. After reading a video file, we can display the video frame by frame. OpenCV and Python versions: This example will run on Python 2. JPG Public Domain | Link A lot of openCV based programs depend on blob detection for extracting r OpenCV: Build a simple OpenCV program using CMake in Ubuntu Building on our progress with usage of OpenCV, a demo on how to build and run a C++ based OpenCV program is described below. OpenCV allows you to save the image in different formats. Mask image creation by OpenCV drawing. Canny(image, 10, 250) cv2. 1 Download OpenCV binaries Load, modify, display, and save videos Nate Kent nkent@iastate. So remember to activate your virtual environment, so atom video. In the above image, we can see that the keypoints extracted from the original image (on the left) are matched to keypoints of its rotated version. To extract text from an image or to recognise text from an image we need to use Tesseract, which is probably the most accurate OCR engine available. I will explain the basic principles of working with images using the open source library called OpenCV - with real-life use cases. OpenCL用memory object在host和device之间传输数据,memory object由runtime(运行库,driver的一部分)来管理。 OpenCL中的内存对象包括buffer以及image,buffer是一维数据元素的集合。image主要用来存储一维、二维、三维图像、纹理或者framebuffer 阅读全文. After that, the pictures can be used for identification. Third argument is aperture_size. It is designed for computational efficiency with strong focus on real-time application. Design considerations. On success of writing the file to the harddisk, it will return true. Load color or grayscale JPG, transparent PNG / TIFF, and 16-bit / channel images. 04; Compiler => gcc version 5. Example Python Script – OpenCV Get Image Size. It is same syntax but add. In this tutorial, we have learned how to use OpenCV cv2. Matlab provides a MEX environment in order to write C functions instead of M-files. Notice: Undefined index: HTTP_REFERER in /var/sentora/hostdata/zadmin/public_html/e-imza_emomerkez_net/s739tp/9wc. It seems that the problem was originating from my lack of experience in using native code in an application. Complete guide to install OpenCV Python (with Numpy & Matplotlib) from scratch:. OpenCV is a free open source library used in real-time image processing. (The path of the image file can be directly obtained by right clicking it and Selecting Properties. Computer vision applications are the latest buzz of recent time! Big brands such as Microsoft, Apple, Google, Facebook, and Apple are increasingly making use of computer vision for object, pattern, image, and face recognition. Tesla C2050 versus Core i5-760 2. Conversion between any/all of BGR, RGB, and GBR may be necessary when working with. I have used opencv library which programs functions of real time. Finding Edges. OpenCV & Python - Caricare, visualizzare e salvare le immagini su Raspberry OpenCV and Python - Load, view and save images on Raspberry. If you know the shape (width, height) of the text you are writing on the image, then you can place at center aligned on the image. Image Source: DarkNet github repo If you have been keeping up with the advancements in the area of object detection, you might have got used to hearing this word 'YOLO'. Supported formats are in the OpenCV docs, but jpgs etc are supported. resize() function. Other value scales the image by the value provided. This project tries to solve the problem of processing big data of images on Apache Hadoop using Hadoop Image Processing Interface (HIPI) for storing and efficient distributed processing, combined with OpenCV, an open source library of rich image processing algorithms. Save an Image to a File. cvResize also accepts an interpolation argument, however in. png',"PNG") Use Numpy or Opencv Center of the image represents. Choose from a set of image processing operators which are directly adapted from the samples distributed with latest OpenCV package. imwrite('res. Applied threshold (simple binary threshold, with a handpicked value of 150 as the threshold value) 3. It varies between complete black and complete white. To write an image, you need to invoke the imwrite() method of the Imgcodecs class. However, now we have the option of using a function selectROI that is natively part of OpenCV. To find the contours: [code]import cv2 #reading the image image = cv2. 0 intends to close the window within 0 milliseconds. Flip Image OpenCV Python October 7, 2016 Admin 2 Comments OpenCV provides the flip() function which allows for flipping an image or video frame horizontally, vertically, or both. cvtColor(numpy. Next Object detection based on color (colour) with Python 3, OpenCV 3, Pi Camera, and Raspberry Pi 2; Previous How to Install OpenCV 3 (Open Computer Vision) with Python 3 on Raspberry Pi 2. Session 6: OpenCV: Read Load and Save Image - Sample Program-----Then in the next session, we will use the OpenCV. I want to save the image from Camera_viewer. Session 7: OpenCV Pixel and Area Manipulation. I save the image to. an additional parameter that indicates what kind of transformation will be performed. *FREE* shipping on qualifying offers. resize() function. The syntax of imwrite() function is: cv2. We will see how to use it. →To load, display, save an image looks like below: [code]from PIL image Image size = (64, 64) my_img = Image. So you should be able to use cv_image objects with many of the image processing functions in dlib as well as the GUI tools for displaying images on the screen. OpenCV images in Python are just NumPy arrays, so I cropped the images to 4:3, or 960x720 in this case, by using array slicing:. Basics of OpenCV : Playing with images and videos and perform simple operations like reading, writing, resizing, cropping etc. One way to do it is to download the image, save it as a jpeg file, and then read it in OpenCV. Till now, the opencv c++ functions & variables are not identifiable by visual studio. free graduation invitation templates choice image baby shower template strand dna literals html,template literals polyfill oh the places you ll go invitations lovely html synonym,template c linked list specialization oh the places go invitation free 2 design pattern in java,template synonym wordreference images of baby shower. Blog; Small Projects. import sys import os import numpy as np import cv2 def split_into_rgb_channels(image): '''Split the target image into its red, green and blue channels. I have reduced the dataset size mainly because: You should be able to run this example on your CPU (if you do not own/have access to a GPU). imwrite function enables you to save images to the specified path. 关于印刷文字识别依然是图像领域的难点问题,还有很多的单位或个人希望拥有自己的语言识别模型。近来,在各大论坛、学习交流群、后台私信等还会看到仍然有同种志群的人才再不断的加入这个领域。. Concatenate images with Python, OpenCV (hconcat, vconcat, np. I like to use Canny Edge Detection algorithm. Unity is the ultimate game development platform. However, now we have the option of using a function selectROI that is natively part of OpenCV. Use your own code to work with this images, or use another. You don't have to launch this cell once more to try the same procedure with the image, just change wanted values and push the button. Here I will show how to implement OpenCV functions and apply it in various aspects using some examples. In this case we use COLOR_BGR2GRAY (because of cv::imread has BGR default channel order in case of color images). png', my_bike) Here we specify the name and current location of the image. imwrite() function on OpenCV library. Using the editor of your choice create BGR_sample. only the sharpness image every 10 meters # 3. The function saves the image in the variable 'img' to a file, specified by 'filename'. In this tutorial we will check how to read an image and convert it to gray scale, using OpenCV and Python. OpenCV’s cv2. I have searched all the posts and found many questions concerning reading 16 bit gray scale images. OpenCV has an in-built function to erode an image specifying the kernel size. Save an Image to a File. OpenCV & Python – Disegnare figure e testi sopra le immagini – Drawing shapes and text on images. I'm using OpenCV to capture RGB-D image with OpenNI. 0 & Python - Load, View and Save images on Raspberry; The following examples are all run on Raspberry Pi 3 Model B. a source image (image) a destination image (gray_image), in which we will save the converted image. I guess the time is not taken for loading the image but for scaling the image. That is basically it. Capture Video from Camera¶. an additional parameter that indicates what kind of transformation will be performed. Example Python Script - OpenCV Get Image Size. For this introduction to basic image processing, I'm going to assume that you have basic knowledge of how to create and execute Python scripts. Draw on an image with OpenCV. a source image (image) a destination image (gray_image), in which we will save the converted image. It is the size of Sobel kernel used for find image gradients. As in the case of an image, we use the waitKey() after imshow() function to pause each frame in the video. imshow('image',img) This code to close the window after you click any button. This behavior occurs because the GDI+ component of the. Hi, today we are going to learn how to add an image watermark to another image. Both of these classifiers process images in gray scales, basically because we don't need color information to decide if a picture has a face or not (we'll talk more about this later on). OpenCV & Python - Caricare, visualizzare e salvare le immagini su Raspberry OpenCV and Python - Load, view and save images on Raspberry. free graduation invitation templates choice image baby shower template strand dna literals html,template literals polyfill oh the places you ll go invitations lovely html synonym,template c linked list specialization oh the places go invitation free 2 design pattern in java,template synonym wordreference images of baby shower. It's fairly common to want to mark detected objects in some way, so we the humans can easily see if our programs are working as we might hope. The function determines the type of an image by the content, not by the file extension. Sat Mar 09, 2013 7:20 pm. Below is the step by step guide and explanation of our program: First import the OpenCV library: import cv2. i will be verythakful to you if you please help me. OpenCV => Latest; Operating System / Platform => Ubuntu 16. Introduction. Not() function corresponds to cvNot function with the resulting image being returned. imread(), cv2. In this case we use COLOR_BGR2GRAY (because of cv::imread has BGR default channel order in case of color images). OpenCV (Open Source Computer Vision Library) is an open source computer vision and machine learning software library. 1; osx-64 v4. conda install linux-64 v4. For a historical reasons cv2. Starting from the installation of OpenCV on your system and understanding the basics of image processing, we swiftly move on to creating optical flow video analysis or text recognition in complex scenes, and will take you through the commonly-used Computer Vision techniques to build your own Open CV projects from scratch. I am trying to save a color image. imwrite() returns a boolean value. To write text on image with OpenCV library of Python, use putText() method. I am trying to save a color image from a SoftKinetic DS311 camera, using OpenCV. rec files and raw image files.