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.jpg is a "lossy" format, you'll never get back exactly, what you wrote.

if you need that kind of exactness, stick with lossless codecs, like .png or uncompressed images, like .bmp

it's not your code.

.jpg is a "lossy" format, you'll never get back exactly, what you wrote.

if you need that kind of exactness, stick with lossless codecs, like .png or uncompressed images, like .bmp