Legacy ImageMagick Discussions Archive

OS/Platform: OSX 10.12.3 IM Version: stable 7.0.5-0 Does imagemagick implement/provide an api or any helpers to use standard JFIF encoding when compressing/encoding a JPEG image? Based on this wikipedia article my understanding of the steps involved are the following: Optionally convert the colors ...

Very interesting. I learned something today about image compression, thanks guys.

So basically image reading/writing between formats, programs, and platforms is variable and imagemagick can't maintain the exact quality/format because of this? Is this correct?

Yes, I kept the output image formats the same. I basically ran the program after compiling it with:

Updated the original post to include details.

I ran the contrast sample code on a couple different image formats and the file sizes would always change. Correct me if I'm wrong but doesn't the same just change the pixel rgb colors, so the file size shouldn't change? It might be worth noting that the sample contrast code isn't updated to work ...

Platform: OSX 10.12.3 IM Version: stable 7.0.5-0 Is it possible to edit an images pixels directly in such a way where when writing out the image the file size is the same size in bytes? I wouldn't be adding or removing pixels or changing the image format/colorspace, I would only change the pixels ...