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![]() Note that putalpha() overwrites the original image, so if you want to keep the original image as it is, use the one copied with copy(). Take the following example code as reference (I use VisualStudio2013 with OpenCvSharp2): using System using using System.Linq using System.Text using using OpenCvSharp using System. If you set an integer value to alpha, the transparency according to the value will be set on the entire surface. Instead of using Mat type, I suggest you to use IplImage type. Emgu.CV.Mat output createImage16Bit (doubleArray, 768, 512, 'outputmat. Set uniform transparency over the entire surface If you set an Image object of the same size as the original image in mode='L' (8-bit grayscale) to alpha, you can set the alpha channel to various shapes.Īs in the constant case, 0 means 100% transparency, 255 means 0% transparency (no transparency). When an integer value of 8 bits ( 0 to 255) is set to alpha, the transmittance according to the value is set on the entire surface.Ġ means 100% transparency, 255 means 0% transparency (no transparency). These dll include cvextern.dll, msvcp120.dll, msvcr120.dll, opencvffmpeg310.dll. dll files from your emgucv install dir such as: D:Emguemgucv-windesktop 3.bin圆4 or bin/x86 to your release folder. If mode of the original image is RGB (8 bit x 3: full color) or L (8 bit x 1: black and white), an alpha channel is newly added, and if RGBA or LA, the original alpha channel is updated. And the test PC system environment is Windows 7 64bit. create 8-bit (or 16-bit) 4-channel image BGRA, where the alpha channel goes last. As it is literally put the alpha channel layer to the original image. With PNG encoder, 8-bit unsigned (CV8U) and 16-bit unsigned (CV16U) images can be saved. ![]() By voting up you can indicate which examples are most useful and appropriate. Very old answer: OpenCV does not support alpha channel, only masking. Here are the examples of the csharp api class Emgu.CV.Image.ToBitmap() taken from open source projects. Then, use mixChannels() and/or split() to separate the alpha channel from others, and threshold on it, as explained below. The parameter of putalpha() is only alpha. Updated answer: Use CVLOADIMAGEUNCHANGED flag to load all four channels (including Alpha) from the image.
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