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How to keep the pixel values same for writing an image

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Shamim
Shamim 2017-12-17
回答： rcjr15 2018-2-19
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?

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Walter Roberson
Walter Roberson 2017-12-17
imwrite(uint8(D), 'd.png')

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rcjr15
rcjr15 2018-2-19
Hi Shamim, Try using this: imwrite(YourImage, 'YourFile.jpg', 'mode', 'lossless') if you want to write it as JPEG file.
Or you can use PNG or TIFF extension which are lossless compression standards.

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