MATLAB: How to keep the pixel values same for writing an image

imageimage analysisimage processing

In attach picture the pixel matrix D is written as an image but if i read the same image from the written one I found that all pixel values except zero are converted to 255. Why this is happening? Is there any solution to keep the pixel values same after writing it?

Best Answer

imwrite(uint8(D), 'd.png')

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MATLAB: Data loss in jpeg

JPEG can be configured between no data loss and 99% data loss.

See the imwrite() 'quality' parameter, and 'mode', 'lossless'

https://en.wikipedia.org/wiki/JPEG#JPEG_compression

MATLAB: How to write each slices from volume in MATLAB into jpg format

You probably don't want to do that anyway, unless you use lossless jpeg2000 format. Use PNG for lossless compression

for sliceIndex = 1 : size(image3d, 3)
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    imwrite(thisSlice, filename);
end

image3d is your 3-D image array.

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