Opencv imread. Here's the code: im = cv2. tif') You forgot to import Numpy in your original code and that is why OpenCV obviously failed to load the image. imwrite() Notes on cv2. However, it is still crashing when I run it from inside Qt. In OpenCV, a video can be read either by using the feed from a camera connected to a computer or by reading a video file. txt is as follows: cmake_minimum_requir Mar 30, 2013 · I'm using the new OpenCV Java bindings to read an image and do some processing on the image. Here you will learn how to display and save images and videos, control mouse events and create trackbar. ACCESS_READ, ACCESS_WRITE, ACCESS_RW, ACCESS_FAST For undestanding UMat usage, a complete sample for face detection is available here. It can be used to store real or complex-valued vectors and matrices, grayscale or color images, voxel volumes, vector fields, point clouds, tensors, histograms (though, very high-dimensional histograms may be better stored in a SparseMat). COLOR_BGR2RGB – BGR image is If it's cv::imread() that is throwing the exception the only solution I know to work is downloading OpenCV sources and building it on the machine, since re-installing OpenCV doesn't fix the issue. Python + OpenCV - Reading the image file name. edit. We fixed this problem with the following macros, maybe you could try this out and use "ourImread" from Dec 12, 2014 · UMat img = imread( "lena. Jul 28, 2015 · The Mat is null even after the imread function. IMREAD_ANYDEPTH) ''' you might have to disable following flags, if you are reading a semantic map/label then because it will n-dimensional dense array class . IMREAD_UNCHANGED loads the image as is (including the alpha channel if present) IMREAD_GRAYSCALE loads the image as an intensity one; After reading in the image data will be stored in a cv::Mat object. Core Operations cv2. In addition, we will show some an example of how OpenCV can use this data for novel and interesting purposes. imread()だとOpenCVで実装された変換処理ではなくコーデックに依存する変換処理が行われるため、プラットフォームによって結果が異なってしまう可能性がある。 3 days ago · When using IMREAD_GRAYSCALE, the codec's internal grayscale conversion will be used, if available. imread :return: a single image or a list of images """ with tempfile. ZipFile('test. request import urlopen def url_to_image(url, readFlag=cv2. 66. 2 days ago · As a first step, we read the image "starry_night. Function used:imread(): In the OpenCV, the cv2. 7 mb in size, because it includes most of OpenCV's capabilities and I only need some core and image processing functions. The second argument is optional and specifies the format in which we want the image. Various interpolation techniques come into play to accomplish these operations. np. Jul 16, 2014 · The way to do this without hacking the OpenCV source code is to use _wfopen (as Remy suggested) to read the whole file into a memory buffer. 1. the important point is that everything prior to that resolves the issue I was having, and now everything is fiiiiine! Feb 24, 2014 · I am just starting to work in the OpenCV library coding in C++. My CMakeLists. Unfortunately, under Windows, it must be a multi-byte string, not an UTF8 string, to handle properly special characters. imread fails in script, not on command line. Let's load a color image first: C++ version only: intensity. gif there is no codec for this (license problem) as a workaround (and if you have ffmpeg support builtin), try: cap = cv2. Syntax: cv2. imread("demo2. 5. tif') and then I display it using plt. hpp. TemporaryDirectory() as tmp_dir: if os. cv2. bmp, dib, jpeg, tiff, ppm, pgm, etc. Jun 11, 2015 · OpenCV with QT cv::imread problem. I added this in because when converting from PIL Image -> Numpy array, OpenCV defaults to BGR for its images. For example, you can create a cv. We can use one simple function to read an image from the disk – cv2. To keep data in GPU memory, OpenCV introduces a new class cv::gpu::GpuMat (or cv2. IMREAD_REDUCED_GRAYSCALE_8 If set, always convert image to the single channel grayscale image and the image size reduced 1/8. I've been trying to run it on VS Code but it doesn't seem to wo Apr 5, 2017 · import cv2 import numpy as np from PIL import Image opencv_image=cv2. imread()El método carga una imagen del archivo especificado. Learn how to use cv2. In this case we load the file opencv. imread('1_00001. The installation seems to be fine and I tested it out on the python IDLE. 4. IMREAD_GRAYSCALE. We can use cvtColor() method to convert a BGR image to RGB and vice-versa. copy(path, tmp_dir) else Apr 28, 2014 · I am trying to read images directly as black and white. Then I tried upgrading to OpenCV 2. P3 # broken. CV_8UC4. We give Image name parameter with extension when we will run python script #Read the image. See examples, syntax, flags and tips for different image formats and window settings. I can't tell why it didn't work, but we had a small workaround for that. Mat) making the transition to the GPU module as smooth as possible. imread("D:\testdata\some. read()), dtype="uint8") image = cv2. 9 and 2. imread() function is used to read an image in Python. En OpenCV imread es una función que puede leer una imagen ya sea en formato jpg, png. *( Examples will be shown in a Python terminal, since most of them are just single lines of code )* Accessing and Modifying pixel values. 6. When using IMREAD_GRAYSCALE, the codec’s internal grayscale conversion will be used, if available. There are various modes in which the image could be loaded. A good knowledge of Numpy is required to write better optimized code with OpenCV. jpg", IMREAD_COLOR ). js API, is used to load modules and files. I am using python version 2. Jan 8, 2013 · Learn how to use cv::imread function to load an image from a file with different formats and flags. imread() You can also read image files as ndarray with Pillow instead of OpenCV. imread says Flags specifying the color type of a loaded image: CV_LOAD_IMAGE_ANYDEPTH - If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit. See the syntax, parameters, return value, and supported image formats of imread() method. getContext("2d"); let matrix = cv. imread function to load images from disk, display them on screen, and save them as new files. imread(img_path) Resu Oct 17, 2013 · In openCV whenever you try to display an oversized image or image bigger than your display resolution you get the cropped display. imread () function to read an image into a numpy array in Python. js and assign the return value to the global variable cv. img = cv2. The class Mat represents an n-dimensional dense numerical single-channel or multi-channel array. imdecode(image, readFlag) # return the image return image Jan 8, 2013 · Note Because canvas only support 8-bit RGBA image with continuous storage, the cv. imread("myImage. See examples for color, greyscale and transparency images, and how imread () decodes the color channels and handles file extensions. dist-info remained and caused errors. IMREAD_COLOR : Loads a color image. jpg") # open image using openCV2 # convert from openCV2 to PIL. The image loads, but it's always grayscale. imread() and paths pointing to files in a jar. Also note that documentation still refers to older flags as imread second parameter. *( Examples will be shown in a Python terminal, since most of them are just single lines of code )* Accessing and Modifying pixel values . imread関数はさまざまな画像フォーマットを読み込むことができます。また、アルファチャンネルを含む画像の読み込みにも対応しています。 #include <opencv2/imgcodecs. I have tried in Windows 7 and Windows 8. imread() Check the current directory; Supported formats for cv2. Por ejemplo, esta función requiere de dos parámetros, el nombre de la imagen a leer y un código de conversión, entonces en la propia lectura se puede hacer una conversión a escala de grises u otro. Installation Select your preferences and run the install command. VideoCapture("f. copytree(path, tmp_dir, dirs_exist_ok=True) elif os. CV_LOAD_IMAGE_COLOR – uglide. OpenCV. COLOR_BGR2RGB) pil_image=Image. On a linux and on a mac it worked. It's a default behaviour. Reading image files in a given directory in Python. read() cap. Several methods are available in OpenCV, the choice typically depends on the particular application. I saw in the documentation that some IMREAD_FLAGS could cause this and I also know that cv2 may change the channel order to BGR. IMREAD_GRAYSCALE - If set, always convert image to the single channel grayscale image (codec internal conversion). js form the current folder, and, as said previously emscripten will call Module. The problem is, however, that opencv. Nov 11, 2012 · cv2. imread. Oct 3, 2017 · Sys will be used for reading from the command line. Jul 18, 2019 · I want to load and display a . IMREAD_ANYDEPTH - If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit. The cv2. I see code examples where people simply load RGB images using img=cv2. While BGR is used consistently throughout OpenCV, most other image processing libraries use the RGB ordering. IMREAD_ANYDEPTH = 2, // If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit. zip', 'r') as zfile: data = zfile. So, when we read an image using cv2. Operating System: Linux macOS Windows Building From Source: Yes No Language: Python C++ Java Android iOS JavaScript Run this Command: Default Result: pip3 install opencv-python Verification To ensure that OpenCV is installed correctly, we can run the following example to show how to read and display […]. Note the ordering of x and y. ) import cv2 imports openCV for usage. Since in OpenCV images are represented by the same structure as matrices, we use the same convention for both cases - the 0-based row index (or y-coordinate) goes first and the 0-based column index (or x-coordinate) follows it. Jan 20, 2021 · Learn how to use OpenCV and the cv2. im Feb 21, 2020 · easy one, imread() won't read any . Its interface is similar to cv::Mat (cv2. onRuntimeInitialized() when Nov 4, 2015 · you may want to delete the very last line with cv2. I'm trying to convert C code to Java using the Java bindings but can't seem to find the relevant methods Oct 26, 2017 · cv2. imshow. Commented Feb 4, 2016 at 9:26. imread("canvas"); Then I used the official opencv. imread() function with flag=0 in OpenCV. jpg") # do stuff with image here The problem is th Nov 26, 2018 · OpenCV image format supports the numpy array interface. See full list on learnopencv. resize() function to upscale, downscale, or resize to a desired size (considering or not considering the aspect ratio). Access Violation with imread. Note: this is a stride trick, so modifying the output array will also change the OpenCV image data. This may be: IMREAD_COLOR loads the image in the BGR 8-bit Oct 15, 2022 · Read an image file with cv2. Specifying path of imread in openCV. tif image in OpenCV Python. the doc of opencv. Jan 8, 2013 · Almost all the operations in this section are mainly related to Numpy rather than OpenCV. The flag parameter of the imread function indicates how the image should be read. Sep 15, 2020 · Basic Block – GpuMat. See examples, code, and tips for configuring your development environment and using argparse. The first step towards reading a video file is to create a VideoCapture object. So, OpenCV can always read JPEGs, PNGs, and TIFFs. See the code below: Nov 26, 2015 · As @TheDarkKnight pointed out, imread is not aware of Qt resources. I tried several versions of opencv. Feb 27, 2016 · import numpy as np # Do not forget to import numpy import cv2 img = cv2. imread() cv2. Jan 8, 2013 · The statement **"cv = require('. IMREAD_GRAYSCALEとしたcv2. For performance reasons I wanted to port the code to C++ but imread() doesn’t work anymore with these pgms. 0. imread and then want to show it with cv2. All the OpenCV array structures are converted to-and-from Numpy arrays and the image you read are represented by OpenCV as arrays in the memory. my current code is import cv2 import os #returns an list of May 14, 2015 · Loading and saving images in OpenCV is quite limited, so what is the preferred ways to load all images from a given folder? Should I search for files in that folder with . imshow - it locks up when I do that. 4 days ago · When using IMREAD_GRAYSCALE, the codec's internal grayscale conversion will be used, if available. You can however write your own loader, that uses QFile to retrieve the binary data from the resource, and uses imdecode (as done internally by imread) to read the image: Jul 5, 2022 · OpenCV-Python es una biblioteca de enlaces de Python diseñada para resolver problemas de visión por computadora. IMREAD_COLOR - If set, always convert image to the 3 channel BGR color image. These flags will be modify the way of PNG image compression and will be passed to the underlying zlib processing stage. Just used imread methods and show on the screen. Ignore EXIF orientation. It is the default flag. release() if ret: # safe to work with image ! OpenCV Resize Image - We learn the syntax of cv2. I am using CMake v2. Is there a correct way to do that other than numpy. asked 2015-06-11 02:07:54 -0600 MarcinXY 16 With OpenCV 3+ use cv2. imread(PATH2EXR, cv2. path. How can I get it in these format dimensions: (width, height) list? When using IMREAD_GRAYSCALE, the codec's internal grayscale conversion will be used, if available. 1 (and perhaps earlier), cv2. Then use OpenCV's function imdecode to create a cv::Mat from that buffer. This is the default that is used here. ndindex(): Which will take h,w or h,w,c (height, width, channel) of an image to traverse Jun 5, 2017 · Reading a Video. I load the image using cv2. require() which is a Node. The imread function within OpenCV is a fundamental tool used for reading images from various file formats into a format compatible with OpenCV. OpenCV Java API: Highgui. Jun 22, 2021 · Learn how to use imread() method of OpenCV-Python to load an image from a file and convert it to a numpy array. but that wasn't something critical to the program - it was just an intermediary step I inserted to make the code in the original question make more sense. imread('PATH') Then I start to see other codes that actually assigned data types: img = cv2. ppm 2 2 255 15 158 150 200 175 150 230 170 150 25 248 150 # newline was missing here Nov 24, 2020 · OpenCV imread, imwrite and imshow indeed all work with the BGR order, so there is no need to change the order when you read an image with cv2. Goals. Let's load a color image first: 3 days ago · C++ version only: intensity. Oct 15, 2022 · cv2. can't imread or imwrite in python. Note May 13, 2016 · cvtColor() is THE opencv implementation and will be consistent across platforms. asarray(bytearray(resp. VideoCapture(0) creates an object called camera, of type openCV video capture, using the first camera in the list of cameras connected to the computer. IMREAD_UNCHANGED = -1, // If set, return the loaded image as is (with alpha channel, otherwise it gets cropped). png") img = cv2. It ran without any problems. The path is correct. A helper function can be made to support either grayscale or color images. See the parameters, examples, and detailed description of the function in the OpenCV documentation. IMREAD_GRAYSCALE : Loads image in grayscale mode; cv2. imshow(img), but the image displayed is all black instead of Aug 23, 2021 · Passing a Python Path object to OpenCV's imread or imwrite results in an undefined error: from pathlib import Path import cv2 img_path = Path("test. imread() Write ndarray as an image file with cv2. Share Mar 11, 2015 · Best way to extract image pixel (r,g,b) value is by using numpy. CV_LOAD_IMAGE_GRAYSCALE is now cv2. Now we can inherit new classes from the base class and use them for our task. 1. 04 distribution. 10 and its the same with this version too. IMREAD_UNCHANGED : Loads image as such including alpha channel Note Instead of these three flags, you can simply pass integers 1, 0 or -1 respectively. Modified 10 years, 4 months ago. 2. I wouldn't be surprised if imread() returns slightly different grayscale values on each Opencv imread does not work with relative path. 4. When you use imread() to convert to grayscale, you are at the mercy of the platform-specific implementation of imread(). exe runs fine directly on my PC and the other machine, HOWEVER it is still instantly crashing when running it from Qt directly AS LONG AS THE IMREAD() AND IMWRITE() FUNCTIONS ARE THERE. Sep 14, 2011 · I can confirm, that there are some problems with imread in OpenCV 2. opencv. js is ready, you can access OpenCV objects and functions through cv object. imread() it interprets in BGR format by default. Aug 2, 2019 · Learn how to use cv2. It is different from native OpenCV because images returned and shown by the native imread and imshow have the channels stored in BGR order. Jun 9, 2019 · other parts is easy to understand except opencv. open(imagefile) as img Jan 11, 2014 · in python3: from urllib. Aug 9, 2021 · Relative Path Using imread (OpenCV) 0. Relative path for imread in python. 4 days ago · In this example, we will show techniques for loading GIS raster formats using native OpenCV functions. Results may differ to the output of cvtColor() On Microsoft Windows* OS and MacOSX*, the codecs shipped with an OpenCV image (libjpeg, libpng, libtiff, and libjasper) are used by default. cuda_GpuMat in Python) which serves as a primary data container. x) imread の引数に指定する mode の解説です。IMREAD_GRAYSCALE や IMREAD_COLOR、もしくは 0 や 1 でお馴染みだと思い… OpenCVの画像読み込みの構造は、2010年当時（OpenCVのコード管理をGithubに持ってきたとき）からずーっと変わっていないです。 拡張性などを考慮した設計がきちんとなされれば、ここまで長く使い続ける事もできるのですね！ 3 days ago · imread_reduced_grayscale_8 Python: cv. cvtColor(code) Parameter: cv2. 0. I am wondering why it was not working with OpenCV 2. imread(path_of_image, flag) rectangle(): In the OpenCV, the cv2. cvtColor(opencv_image, cv2. Maybe it's some kind of bug or permissions issue because the exact same installation of python and cv2 packages in another computer works correctly. jpg extensions, store the names and use imread with every file? Or is there a better way? Subscribe to the OpenCV YouTube Channel featuring OpenCV Live, an hour-long streaming show; Follow OpenCV on LinkedIn for daily posts showing the state-of-the-art in computer vision & AI; Apply to be an OpenCV Volunteer to help organize events and online campaigns as well as amplify them; Follow OpenCV on Mastodon in the Fediverse; Follow Apr 6, 2023 · I'm reading an jp2 file using openCV's imread(). Jun 19, 2017 · # first import os and enable the necessary flags to avoid cv2 errors import os os. Aug 31, 2019 · I'm currently reading BGR values from a set of images, I have used a variety of imread flags however i cant seem to pull it as BGRA. imread function provides the option of specifying how an image should be loaded by making use of the flag parameter. Aug 13, 2021 · 今回はOpenCVで使われるimreadに関して、使用法から配列が画像になる仕組み等、徹底解説いたしました。配列が画像になる仕組みを知りたい、なんとなくimreadを使っていた方へおすすめです。ぜひ最後までご確認ください。 3 days ago · Almost all the operations in this section are mainly related to Numpy rather than OpenCV. Jan 25, 2014 · with zipfile. Jan 14, 2023 · PythonでOpenCVを使った画像の読み込みについて紹介します。OpenCVで画像を読み込むためのcv2. rectangle function is used to draw a rectangle on the image in Pyth Aug 28, 2017 · For my particular use case, I needed to convert the string into a PIL Image to use in another function before converting it to a numpy array to use in OpenCV. 0-dev, and the code that I used before does not work anymore. … Jul 30, 2018 · I pip installed OpenCV-python. Once opencv. ascii. imread(sys. Jan 8, 2013 · IMREAD_COLOR loads the image in the BGR 8-bit format. The primary objectives for this tutorial: How to use OpenCV imread to load satellite imagery. Feb 8, 2024 · はじめにOpenCV (v4. Reading an Image using OpenCV imread() function; Image resizing with a custom Width and Height; Resizing an image with a Scaling factor Aug 12, 2024 · In this article, we are going to see how to draw multiple rectangles in an image using Python and OpenCV. Any transparency of image will be neglected. May 2, 2014 · Opencv imread() to Mat_<float> Ask Question Asked 10 years, 4 months ago. hpp> Imwrite PNG specific flags used to tune the compression algorithm. imread('ortho. isfile(path): shutil. OpenCV uses BGR image format. Then I deleted all files that had to do with opencv too in site-package after the uninstallation, files related to opencv like opencv_contrib_python-4. 2. Jan 4, 2016 · Breaking down your code example (Explanations are under the line of code. 3. Jun 15, 2020 · In case you want to know the fun reason why OpenCV uses BGR format, click on this link. imread でファイルパスに日本語を含む画像を読み込もうとすると失敗する．cv2. jpg') # how to open this using imread or imdecode? The question is: how can I open this using imread or imdecode for further processing in opencv without saving the image first? Update: Here the expected errors I get. Viewed 9k times 1 I was reading many images in my program Note: At least in OpenCV 3. Mat type is cv. Notice the COLOR_BGR2RGB which means that # the color is converted from BGR to RGB color_converted = cv2. 10? The problem was only with windows systems. fromstring is deprecated now, we should use np Jan 3, 2023 · In this article, we will convert a BGR image to RGB with python and OpenCV. It also supports model execution for Machine Learning (ML) and Artificial Intelligence (AI). Oct 23, 2012 · Here is a method that returns the image dimensions: from PIL import Image import os def get_image_dimensions(imagefile): """ Helper function that returns the image dimentions :param: imagefile str (path to image) :return dict (of the form: {width:<int>, height=<int>, size_bytes=<size_bytes>) """ # Inline import for PIL because it is not a common library with Image. shape(). Other than that, the code works perfectly using Python 3. js is 7. In order to view the image in the window of your choice openCV encourages to use named window. opencv_flann: feature matching, rare uses on mobile, build the source externally if you need: opencv_gapi: graph based image processing, little gain on mobile: opencv_gpu: no cuda/opencl on mobile: opencv_imgcodecs: link with opencv_highgui instead: opencv_java: wrap your c++ code with jni: opencv_js: write native code on mobile: opencv_legacy May 5, 2017 · :param path: path of a single image or a directory which contains images :param args: other args passed to cv2. Dec 6, 2017 · 概要Python OpenCV で日本語を含むファイルパスを扱う際の以下2点の問題への対処方法の案．cv2. imread . qt. png or . js and imread() worked. com Learn how to use the imread(), imshow() and imwrite() functions in OpenCV to read, display and write images in Python and C++. See examples of different flags, color channels, and PNG images with transparency. imread is always returning NoneType. OpenCV provides a real-time optimized Computer Vision library, tools, and hardware. 8. I'm writing an OpenCV program in python, and at some point I have something like import cv2 import numpy as np img = cv2. Then I installed OpenCV 3. So now the . 0 version. The first one is the OpenCV library. Using cv2. jpg" from the OpenCV samples. resize() and how to use this function to resize a given image. gif") ret, image = cap. Example from OpenCV 4. Imread in Android OpenCV shows an image with too much blue colour. Apr 21, 2021 · let canvas = document. However the problems only occurred on a Windows 32bit system. You may be thinking, "why convert to RGB?". 6 on 64 bit Windows 7. Results may differ to the output of cvtColor() On Microsoft Windows\* OS and MacOSX\*, the codecs shipped with an OpenCV image (libjpeg, libpng, libtiff, and libjasper) are used by default. Feb 13, 2016 · Hello at all! I'm writing because I have read the function imread but I don't understand what means the flag CV_LOAD_IMAGE_ANYDEPTH; could anyone tell me what is the depth of image? And what means ' If the flag is set, return 16-bit/32-bit image when the input has the corresponding depth' ? thanks you soo much for help Sep 30, 2013 · How to get the size of an image in cv2 wrapper in Python OpenCV (numpy). We can use cv2. Aug 19, 2019 · @StevenPuttemans I managed to get it working on the other machine by copying the correct DLLs over. IMREAD_ANYCOLOR | cv2. 0, the sample code is working perfectly. Mat from an image by cv. val[0] contains a value from 0 to 255. tif",CV_LOAD_IMAGE_COLOR) Dec 3, 2023 · OpenCV (Open Source Computer Vision Library) is an open-source computer vision and machine learning software library. imread() does not raise an exception; JPEG library; If images cannot be read with cv2. argv[1]) #The function to read from an image into OpenCv is imread() #imshow() is the function that displays the image on the screen. getElementById("canvas"); let ctx = canvas. imread(f, cv2. How can I imread just an ROI, not the whole image? jpg does not show Apr 18, 2024 · One could think that the images are just not compatible with opencv but the weird thing is that I have a Python Script that reads that same images with imread() without problems. imread () method to load an image from a file in Python OpenCV. I am building a project with OpenCV 4 beta and when I use the function cv::imread or cv::imwrite I get an undefined reference to the functions. In order to do so, a call to the cv::imread function loads the image using the file path specified by the first argument. This means the BGR -> RGB conversion can be conveniently done with a numpy slice, not a full copy of image data. If you wanna draw this transparent image over another image, open your image as answered by @satya-mallick (mode IMREAD_UNCHANGED), then use this method to draw the image over a frame Mat: Apr 29, 2020 · Is it possible to opencv (using python) as default read an image as order of RGB ? in the opencv documentation imread method return image as order of BGR but in code imread methods return the image as RGB order ? I am not doing any converting process. isdir(path): shutil. 7 and OpenCV 2. IMREAD_COLOR): # download the image, convert it to a NumPy array, and then read # it into OpenCV format resp = urlopen(url) image = np. /opencv. camera = cv2. The first Command line argument is the image image = cv2. Learn how to setup OpenCV-Python on your computer! Gui Features in OpenCV. js')"** requires the file opencv. environ["OPENCV_IO_ENABLE_OPENEXR"]="1" import cv2 # then just type in following img = cv2. I recently updated my OpenCv version to 3. IMREAD_UNCHANGED = -1, //!< If set, return the loaded image as is (with alpha channel, otherwise it gets cropped). read('test. 3 days ago · Introduction to OpenCV. IMREAD_COLOR instead of cv2. fromarray(color_converted) Jun 2, 2023 · Describe the feature and motivation Currently, imread() and imwrite() accept a cv::String to locate a file. 9. You might need May 4, 2021 · noob here to python and OpenCV. IMREAD_GRAYSCALE = 0, //!< If set, always convert image to the single channel grayscale image (codec internal conversion). May 9, 2019 · The flags and the correspondings meanings: from OpenCV imgcodecs. 3(which I have never used before) to build and compile my project on an ubuntu 11. Once all these files were deleted I reinstalled opencv: pip install opencv-python now it works for me Jun 27, 2019 · UPDATE: The problem was due to broken PPM file which did not conform to the there is a newline character at the end of each line. imread. getUMat( ACCESS_READ ); Different access flags as in source are . tnvhouxhtwjrpixnbkjaqygeprpigmrxtnnzmjxjvcnjqvedtqivijryvr