Is it possible to apply colorMap to greyscale PNG or JPG images?

[cpinchuk]

I have tried to apply colorMap to a greyscale PNG image and also tried other ways to apply false colour mapping, but the renderer fails miserably by calculating the pixel positions wrongly. Do I need to write my own WebGL RGBa Shader or can it be done within the existing framework? Thank you.

[chafey]

Did you do a view source on this example:

https://rawgit.com/cornerstonejs/cornerstone/master/example/falseColorMapping/index.html

On Tue, Jun 23, 2020 at 8:21 PM Costa P [email protected] wrote:

I have tried to apply colorMap to a greyscale PNG image and also tried other ways to apply false colour mapping, but the renderer fails miserably by calculating the pixel positions wrongly. Do I need to write my own WebGL RGBa Shader or can it be done within the existing framework? Thank you.

[image: Screen Shot 2020-06-24 at 11 19 20 am] https://user-images.githubusercontent.com/65931035/85485765-b58cfc80-b60c-11ea-89b3-051336ef8a9f.png

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[cpinchuk]

I have it working

for that fixed the data population function in storedPixelDataToCanvasImageDataPseudocolorLUT

 while (storedPixelDataIndex < numPixels) {
      grayscale = grayscaleLut[pixelData[storedPixelDataIndex]];
      
     //index iteration fix 
     storedPixelDataIndex= storedPixelDataIndex+4;
      
      rgba = clut[grayscale];
      canvasImageDataData[canvasImageDataIndex++] = rgba[0];
      canvasImageDataData[canvasImageDataIndex++] = rgba[1];
      canvasImageDataData[canvasImageDataIndex++] = rgba[2];
      canvasImageDataData[canvasImageDataIndex++] = rgba[3];
    }

It was originally inserting the wrong pixel value every 4th. Example of greyscale image data converted with a colorMap (all the pixels had the same value for the experiment):

136,8,240,255, (correct) 136,8,240,255, (correct)   136,8,240,255, (correct),  255,252,250,255, (WRONG)
136,8,240,255, (correct)  136,8,240,255,(correct)    136,8,240,255,(correct)    255,252,250,255,(WRONG) ...

[andydoe19]

Hi @cpinchuk can you please provide a link to a working example on this, I will be sooo thrilled if you've been able to get this working, because am unable to apply colormap to my images loaded with cornerstoneWebImageLoader. Thank you in advance!

[David2k13]

This problem has not been fixed

[No-Dream-No-Life]

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