I'm going to call the image that isn't inverted "right.jpg" and the image that is inverted (not really inverted, but certainly it's not right) "wrong.jpg", to avoid typing really long file names.
"Right.jpg" doesn't have an embedded ICC profile. Right.jpg was created using Gimp, according to the metadata. Upon selecting it to open it, Gimp displays a normal-looking thumbnail that resembles "right.jpg". Upon opening it, Gimp automatically assigns the Gimp built-in sRGB profile and right.jpg looks like you'd expect. "Wrong.jpg" does have an embedded ICC profile with description "sRGB IEC61966-2.1". From the embedded profile metadata it appears to be some version or another of the original sRGB profile created by Hewlett-Packard and Microsoft back in 1998. That profile or versions thereof has been used by almost all imaging software and operating systems, until V4 profiles started creeping in. Upon selecting wrong.jpg with Gimp to open it, the thumbnail looks more or less like the thumbnail for right.jpg, but not exactly (the colors are washed out, the blue looks purple, the green looks brown). But upon actually opening it, the colors go all wrong. However, assign the Gimp built-in sRGB profile in place of the embedded profile and wrong.jpg now looks very similar to the right.jpg, slightly washed out, purple instead of blue, brown instead of green, but not "inverted". According to the metadata, wrong.jpg is a Photoshop thumbnail. Was the original image created by Photoshop? Was the thumbnail really created using Photoshop and extracted using some software? I've attached a spreadsheet with the embedded metadata for right.jpg, wrong,jpg, and the argyllcms version of the original MS/HP sRGB profile, lined up so the metadata fields match. There are very small differences in the metadata, not enough to explain why wrong.jpg looks wrong until the Gimp built-in sRGB profile is assigned.Attached is also a copy of "wrong.jpg" with the argyllcms version of sRGB embedded so you can see the color differences. I'm going to try to extract the embedded ICC profile in wrong.jpg to see what the tone curves look like. Ofnuts is right, the problem (or at least one problem) is the embedded profile. And the two images aren't the same to begin with. Elle Stone -- http://ninedegreesbelow.com - articles on open source digital photography _______________________________________________ gimp-user-list mailing list List address: [email protected] List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list
