How JPEG Algorithm Used to Set Colors Darker

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How Algorithm Used In JPEG Compression For Set Colors Darker and Subtract RGB Codes
My Program %100 Need Correct and Original RGB Color Codes Please Help Me
My Last Answer Can't Help Me
I Want a Math or Drawing Function to Restore My Colors
Very Thanks Mr.Deepak Jena For Last Answer

Posted 7-Oct-12 5:17am

Hossein Soror Golshani

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OriginalGriff · Answer 1 · 2012-10-07T05:26:00

Sorry, but you can't get 100% correct and original color codes if you use JPG formats - it is a lossy compression technique which uses pixel similarity to discard information without significantly affecting image quality. All JPG processing converts from RGB to YCbCr as the first stage in the compression, and it is not possible to reverse the conversion and restore the original image, despite what TV crime dramas may tell you!

If you want to retain 100% original color information then do not use a lossy compression file format - use BMP or similar which does no compression at all, and (if necessary) use a non-lossy compression technique such as ZIP afterwards.