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Color Bug

 
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Yann Queniart
108 posts
Thu May 09, 19
12:31 PM
Hi, i have recently a bug with color of my pictures.

My pictures are green, there is a problem with ICC profiles if pictures are resize.

If I generate pictures with 1500px height or width, the large image color is ok and small and thumbnail have wrong color.

If I generate pictures bigger than 1500px large, small and thumbnail have wrong color.

I have try different software to generate jpg, I have try png format, same problem. I have try to change php engine 7.2 and 7.0 same problem.

I think that : when pictures engine (I think GD is used or perhaps imagemagick) touch pictures the color have problem.

Sample here with bad color : https://www.yannqueniart.com/portfolio/equestre-divers-illustrations/#photo=6f65a5a4b76448948ddab7ba1996a149

I have attached the file with real color, there is a great difference.
Yann Queniart
108 posts
Thu May 09, 19
12:32 PM
I have forget to attached the pictures, please find it here.
Attached Photos

Yann Queniart
108 posts
Thu May 09, 19
12:47 PM
I have read some things on forum and I can confirm I export with sRGB profil
Vance Birno
55 posts
Thu May 09, 19
12:50 PM
Colors look fine on your site, keep in mind not all devices or computer monitors are color correct. On the same token do not judge color correctness by high ISO images, the only way to know if you are color correct is first making sure your monitor is correct (Buy a spider to check and maintain color) Shoot a color card at low iso, then color balance all monitors to that.
Yann Queniart
108 posts
Thu May 09, 19
12:58 PM
Hi, sorry but the color is not good on my site. Pictures are adjusted with Capture One and show on Sytist site on the same screen and the color is not the same. There is problem when pictures are upload and proceed by sytist. It is a recent bug, I don't have problem before.

I have Eizo CS2730 screen calibrated with Spyder 5, my colors are normally OK.

If i show pictures with any other screen there is the same difference between original and sytist picture.
Vance Birno
55 posts
Thu May 09, 19
1:16 PM
Well sounds like you have the tools, so i would guess it's either gd Library or Imagemagick is the problem, sytist on displays, and as far as i know has nothing to do with color profiles. Guess wait for Tim to answer.
Yann Queniart
108 posts
Fri May 10, 19
1:37 AM
Thank you, I have find there bug.

Since some last versions Capture One use it own ICC profil for RGB named sRGB Color Space Profile, this ICC profile is located in Capture One App Folder.

If I use the Default Mac OS RGB (not show by default, need to check show all) lacerated in /System/Library/ColorSync that work.

So the problem is effectively an ICC profile not supported by GD library.
Vance Birno
55 posts
Fri May 10, 19
6:17 AM
Great you found the problem, just to clarify sRGB stands for standard red green blue, which was created in about 1996, but it sounds like capture one has a problem with it. sRGB is what i shoot on nikon and what i edit it in lightroom and photoshop. Check your camera you may have accidentally changed your shooting profile, most cameras give you a choice of sRGB or RGB.
Edited Fri May 10, 19 6:18 AM by Vance Birno
Yann Queniart
108 posts
Fri May 10, 19
7:38 AM
I have check my camera, i use sRGB. The problem is really the ICC setting of the export profil.

Thank you for your help
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