thehelp1
commented
7 years ago Awesome work guy.
On Mar 25, 2017 9:23 PM, "Raphael Schaad" notifications@github.com wrote:
The file size compression worked well and I don't see any artifacts but the colors changed "significantly" (for the field of photography) in all three examples I tested. One is attached (original and Guetzli-compressed -- best seen when downloaded and switched back and forth in place). All Guetzi-compressed ones seemed more red. What is the reason for that and can color somehow be preserved?
Photo by VisibleCommunities.mit.edu / CC BY 4.0
Original: [image: dsc00096] https://cloud.githubusercontent.com/assets/439447/24328215/abf01890-11b1-11e7-85f6-290077cd5a61.jpg
Guetzli-compressed: [image: dsc00096] https://cloud.githubusercontent.com/assets/439447/24328220/bc1ef34e-11b1-11e7-9d13-a8fe026094a6.jpg
— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/google/guetzli/issues/131, or mute the thread https://github.com/notifications/unsubscribe-auth/AZNZWE_B1rn8csoIeSMa7_PpM7Bf1QGXks5rpdopgaJpZM4MpTU_ .
brualan
Most likely Guetzli has problems with the gamma of the image
Cuupa
The file size compression worked well and I don't see any artifacts but the colors changed "significantly" (for the field of photography) in all three examples I tested. One is attached (original and Guetzli-compressed -- best seen when downloaded and switched back and forth in place). All Guetzi-compressed ones seemed more red. What is the reason for that and can color somehow be preserved?
PS: As I was opening both images in Chrome browser tabs and switching back and forth, I didn't notice the red-shift. I suspect the experienced difference might stem from the way I previewed the files (e.g. using macOS quick look)?
Photo by VisibleCommunities.mit.edu / CC BY 4.0
Original:
Guetzli-compressed: