Add transparency to colormap
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Hi,
How can I add transparency to a colormap 2D?
I have the following code and I am using the version R2016a of MATLAB.
function covFunc( mapa, minPrx, maxPrx, arrayPrx )
wallMask(:,:,1) = mapa.img(:,:,1) ~= 255 & mapa.img(:,:,2) ~= 255 & mapa.img(:,:,3) ~= 255;
cover = (arrayPrx') .* ~wallMask + wallMask.*minPrx;
cover = cover + 0 * wallMask;
cover = (arrayPrx') .* wallMask;
imshow(cover);
caxis([minPrx maxPrx]) % Set colormap limits
colormap (jet(round((maxPrx-minPrx/50))))
colorbar
end
I need that the image stays intact and the new colors created by the color map stay transparent.
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Image Analyst
2020-8-11
编辑:Image Analyst
2020-8-11
I'd probably create a new RGB image with the colormap and ind2rgb(). Then take a weighted average of them
rgbImage = cat(3, grayImage, grayImage, grayImage);
rgbOverlay = ind2rgb(grayImage, cmap);
factor = 0.6; % 60% or whatever.
rbgOutput = uint8(factor * double(rgbImage) + (1-factor) * 255 * rg0bOverlay);
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Image Analyst
2020-8-16
You forgot to attach your script and your image. So, how can I help? cmap can be as many colors as you want to quantize it into. I have no idea what your maxPrx and minPrx are.
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