Inspiring

Answered

Color shift when jpeg compression

Forum|Forum|8 years ago
October 23, 2017
4 replies
3263 views

Hello.

It's a strange story I'm living here: First, i have to tell it's the first time I have this kind of problem since I use photoshop (10 years).
Ok here we go:
1) I made a Graphic model for a client's website.
2) Somebody else made the integration and the "cut"
3)My client ask me to re-touch the alreadycutimages.
4) I made "retouches", I save => different on the baskground and so no more matching with the rest of the website background.

The RGB code is not the same anymore!

What I tried?

1) change color profile => no results
2) change color proof profile => no results
3) "save as" operation => no results
4) "save for internet" => no results.

BUT

5)"save as" in 100% jpeg => it's ok. The tone is the same Oo but the problem is i need to compress... so...
6) "Save as" in 90% jpeg => NNNNNoooo Colors shifting.

What's the matter? What do i do wrong?

Thank you.

This topic has been closed for replies.

Correct answer Kinsi

Ok I think I found it... I don't know why or how but the CC2018 update have totaly changed my coulours space settings...
It's seems to be back to normal again.
Thank for your help though.

D Fosse

Community Expert

I would strongly recommend everyone to not change anything in Color Settings, unless all the implications of doing so are understood.

The default settings are safe settings where not much can go wrong.

Above all, always keep Color Management Policies at "Preserve Embedded Profiles". Never change that - it will very quickly get you into trouble you can't get back out of.

The one exception is the Save For Web and Export settings. Here, for some reason I can't even begin to understand, the default is to not embed the profile. The profile should always be embedded, no exceptions, web or otherwise. So this box needs to be checked.

K

KinsiAuthor

Inspiring

Above all, always keep Color Management Policies at "Preserve Embedded Profiles". Never change that - it will very quickly get you into trouble you can't get back out of."

The one exception is the Save For Web and Export settings. Here, for some reason I can't even begin to understand, the default is to not embed the profile. The profile should always be embedded, no exceptions, web or otherwise. So this box needs to be checked."

... i would give the opposite tip: always delete embebbed profiles (especillay when it's for the web)... It's exactly when i let the embbed profile that i have color shifts...

D Fosse

Community Expert

Kinsi wrote
... i would give the opposite tip: always delete embebbed profiles (especillay when it's for the web)... It's exactly when i let the embbed profile that i have color shifts...

That just shows you don't understand what's happening. A color shift happens when color management stops, when the profile is not read. Then you're at the mercy of how your particular monitor displays color - with no idea of how it will display on any other monitor or system out there.

Most major web browsers today have full color management, and there's no reason to work without color management for the web.

If you're comparing with non-color managed browsers or photo viewers, then yes, obviously, you will have a color "shift". Because they don't read the profile.

To accommodate environments without color management you need to prepare your files accordingly. That basically just means sRGB, which is close enough to most standard displays that most people will see it roughly right. But if you have a wide gamut display, like for instance all the new iMacs and MBPs, then you need full color management at all times. That's just a property of the display. It won't display sRGB correctly, ever, unless there is a fully color managed pipeline that corrects for the display.

K

KinsiAuthorCorrect answer

Inspiring

Ok I think I found it... I don't know why or how but the CC2018 update have totaly changed my coulours space settings...
It's seems to be back to normal again.
Thank for your help though.

dreman33

Participant

Sorry How did you fix this issue? I’m having this massive issue with it also and need it fixing ASAP. Can you please walk me through like a 2 year old? ThAnks

K

KinsiAuthor

Inspiring

I have just changed my color settings ;-)
For the rest, it depends on what do you want to have as settings

清

清飞梦81876416

Participating Frequently

好像图片在PS或者LR软件里面的显示效果本身就比实际情况要鲜艳好看一点。我同意一楼的说法，我一般习惯用导出，色差基本看不出来。

D Fosse

Community Expert

I don't understand half of what you're supposedly doing here, BUT:

In Save For Web / Export As, make sure these two boxes are checked:

It will then display correctly in color managed applications such as Photoshop. In applications that are not color managed, all bets are off anyway. But sRGB files will usually be roughly right.

K

KinsiAuthor

Inspiring

"I don't understand half of what you're supposedly doing here"
oh ? I thought I have briently explained though.

I have an image... I open it in photoshop when i compressed (even a little bit) and save it in jpeg => there is a color shift.

That's all. ;-)

Never embeding color profile in a web image (usually)!
But even with this, that doesn't work. I have a color shift...

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