PNG Image Saturation Loss on Resize

[colomet]

I work with PNG images made with grey colors. And the colors change because of wordpres, not the original image, but all the new sizes.

By default make the colors much darker but sometimes, also is weird:

Left and right are the same image. Some times handle even different for the same K=70 color.

( I export with Adobe illustrator to sRGB )

[joemcgill]

Hi @colomet would you mind uploading an example image so we can take a closer look?

[colomet]

Example files (png and ai)

[colomet]

the examples.zip contains:

--the original .ai file: OriginalFile.ai

--the files download with ftp from the server after wordpress make the new sizes: OriginalFile.png and one of the new sizes OriginalFile-887x1024.png

--the files download with ftp from the server after wordpress make the new sizes (those files have been optimiced first):OriginalFile-Optimicedfirst.png and one example of the new sizes OriginalFile-Optimicedfirst-768x887.png

[alexvorn2]

This is how the image get resized, I don't think that something can be fixed here because WordPress is using external libraries to resize such as ImageMagick and GD.
​http://php.net/manual/en/book.image.php - GD is responsible for most image resizes.
​http://php.net/manual/en/book.imagick.php - ImageMagick is responsive too if it is installed.
So WordPress has nothing to do with image color loss.