Inspiring

Question

Background color shift even if set to constant swatch?

Forum|Forum|2 years ago
March 9, 2024
3 replies
3582 views

I take pictures for a client who has a shoes brand. All the shoes have a constant colored background, which was picked before the beginning of the project, and all shoes get cut out and placed on a color applied by an action which has been unedited in 3 years.

They noticed there is a slight shift in color from time to time, portrayed in the screenshot (screenshots have a contrast layer on top to exacerbate the issue). What could cause the issue?

All pics are edited in SRGB 8bit to avoid issues, and the photoshop Color Settings have been set to North america General purpose 2 - preserve profiles for years. Can anyone help? thanks!

macOS

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S

shaquon_knauls

Participant

Its light

Shaquon Knauls

c.pfaffenbichler

Community Expert

Please elaborate.

c.pfaffenbichler

Community Expert

Please set the Status Bar to »Document Profile« and post screenshots with the pertinent Panels (Toolbar, Layers, Options Bar, …) visible of two images that do not match.

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_FT_Author

Inspiring

so here it is, and here is what I did: i opened two pictures from two shoots in psd, freshly exported jpgs and old exported jpgs. (there is a contrast mask). all pics are in srgb.

newly exported files show the same divergence toward red, while the old exports go towards yellow and red respectively.

c.pfaffenbichler

Community Expert

so here it is, and here is what I did: i opened two pictures from two shoots in psd, freshly exported jpgs and old exported jpgs. (there is a contrast mask). all pics are in srgb.

newly exported files show the same divergence toward red, while the old exports go towards yellow and red respectively.

By @_FT_

What were the exact export settings?

D Fosse

Community Expert

Numbers are color space specific. As long as you make sure the sRGB profile is embedded in every file, the color is unambiguously defined and invariable. The working space or general color settings are not important, that's just defaults. The embedded profile will always override that.

The wild card here is jpeg compression. That can easily shift a color channel a value or two, enough so that you can see it if you put them side by side. I'm guessing that's the case here. The only way to avoid that is to avoid jpeg, which is by nature unpredictable and inconsistent. PNG is better. It also uses compression, but a non-destructive type that doesn't change any values.

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_FT_Author

Inspiring

I agree with you, however client requested jpgs for the website, otherwise wordpress or whatever platform would handle the conversion itself, so I did my best to preserve the output.

here is what I did: i opened two pictures from two shoots in psd, freshly exported jpgs and old exported jpgs. (there is a contrast mask). all pics are in srgb.

newly exported files show the same divergence toward red, while the old exports go towards yellow and red respectively.

this is unfortunate, I'm looking unprofessional towards the client while it's not my fault directly...

D Fosse

Community Expert

These fall into two distinct groups. One has variances of one or two values per channel, and that's typical of different jpeg compression algorithms. This is inevitable with jpeg.

The other group is much more different, up to five values per channel. That is clearly visible, and cannot be explained by jpeg compression. This has to be that the sRGB profile has not been correctly handled - not embedded, not converted correctly. I have never seen this happen and I cannot think of any way that could happen.

All I can say now is revisit your procedures and make absolutely sure the sRGB profile is embedded when you export.

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