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Colours etc "wrong" on import (profile?) - mister_marbles - 03-11-2021
Hi all.
tl;dr
Photo edits don't have the desired results. Probably because when I import photos into Gimp, the brightness, contrast, saturation (etc.) change subtly but perceptibly. I think this is due to Color / Colour Profiles(?) What am I doing wrong, and how can I get more predictable results? Thank you in advance.
more
Apologies for what feel like pretty "noob" questions. (And further apologies if they've been answered 1,000 times already; I searched the forum, but maybe my search fu is lacking).
The problem:
I take photos with my smartphone, then import the jpegs into Gimp for post-processing. But they look different in Gimp - flatter, greyer, less bold - than they do in the File Browser (Finder; I'm using macOS on a MacBook pro). I think this is due to the Colo(u)r Profile: Finder says "Colour profile: sRGB IEC61966-2.1" but AFAICT Gimp is using sRGB(?)
I've experimented with Image > Colour Management > Assign Colour Profile... and Convert Colour Profile... ...but I can't discern any difference, so I assume I'm using them wrong.
Q1. Am I right in my assumption: is the Colour Profile the problem?
Q2. I want the changes I make in Gimp to accurately reflect what I'll see in Finder; what's the best way to achieve this?
Bonus question (...possibly opening a can of worms?): if my ultimate goal is to post the results online, does it matter which colour profile I use...?
Any help gratefully received
P.S. macOS, Gimp 2.10
RE: Colours etc "wrong" on import (profile?) - Ofnuts - 03-11-2021
sRGB comes under many names but is is always the same.
Edit>Preferences>Color management: is the managed color display enabled?
Also, assuming that the Apple finder displays the photos without any enhancements could be incorrect...
RE: Colours etc "wrong" on import (profile?) - rich2005 - 03-11-2021
As Ofnuts says, how do you know that it is not the image viewer application causing a change.
Just for info, there is no appreciable difference between the embedded Gimp sRGB and the Industry standard sRGB IEC61966-2.1 extracted these with exiftool.
[attachment=5719]
If you are worried about it, turn color management off in Edit -> Preferences.
RE: Colours etc "wrong" on import (profile?) - Kevin - 03-11-2021
(03-11-2021, 12:46 PM)Ofnuts Wrote: sRGB comes under many names but is is always the same.
I think Elle Stone would disagree with that statement: https://ninedegreesbelow.com/photography/srgb-profile-comparison.html
RE: Colours etc "wrong" on import (profile?) - mister_marbles - 03-11-2021
Hi all, and thank you very much for responding; I appreciate it.
Quote:Also, assuming that the Apple finder displays the photos without any enhancements could be incorrect...
@Ofnuts: Well, quite. And I am definitely not assuming this!
But there's clearly something different between the way Finder parses the image file, and the way Gimp does - whether that's a configuration difference / mismatch or something else - because the same images look different in the two of them. I'm trying to understand why, so I can get more predictable results.To give you an example: I wanted to enhance an image by boosting the contrast and saturation slightly (a simple task for Gimp, given all the amazing tools it has). And I was able to get what I wanted pretty quickly...but when I exported it from Gimp and compared it to the original, I discovered that the latter actually looked better (better contrast, better saturation) in Finder
When I went back to Gimp, I realised that the original layer (the un-processed and un-edited image imported directly into Gimp) looked different from the way it looked in Finder. Which is when I started to wonder about Colour Profiles...Quote:If you are worried about it, turn color management off in Edit -> Preferences
@rich2005: I'm not worried: I'm trying to get results that are reliable, repeatable, predictable.
Quote:I think Elle Stone would disagree with that statement: https://ninedegreesbelow.com/photography...rison.html
@Kevin: That's such a good site: lots of great information, and conveyed very clearly. Nice pictures, too. I think the author is very generous with their time and knowledge
Thanks again to all.
RE: Colours etc "wrong" on import (profile?) - rich2005 - 03-11-2021
(03-11-2021, 04:08 PM)mister_marbles Wrote:Quote:If you are worried about it, turn color management off in Edit -> Preferences@rich2005: I'm not worried: I'm trying to get results that are reliable, repeatable, predictable.
Then you need to color calibrate your computer display. This comment a reverse of yours, a PS user complaining that the image does not look the same in a mac.
https://community.adobe.com/t5/photoshop/colors-of-the-edited-image-looks-different-on-mac-and-iphone-comparing-to-the-same-image-on/m-p/9557293
RE: Colours etc "wrong" on import (profile?) - mister_marbles - 03-11-2021
(03-11-2021, 06:03 PM)rich2005 Wrote:(03-11-2021, 04:08 PM)mister_marbles Wrote:Quote:If you are worried about it, turn color management off in Edit -> Preferences@rich2005: I'm not worried: I'm trying to get results that are reliable, repeatable, predictable.
Then you need to color calibrate your computer display. This comment a reverse of yours, a PS user complaining that the image does not look the same in a mac.
https://community.adobe.com/t5/photoshop/colors-of-the-edited-image-looks-different-on-mac-and-iphone-comparing-to-the-same-image-on/m-p/9557293
(?)
Are you sure? I followed the link...but that's for a different issue. The problem there is that images look different on different devices; my problem is that images look different on the same device - the same screen - but different applications (Gimp, and Finder).
Forgive me - perhaps I'm missing something - but if I (re)calibrate the screen then surely that will affect everything i.e. all applications, including Gimp and Finder(?)
How will (re)calibrating the screen affect disparities between applications...?
RE: Colours etc "wrong" on import (profile?) - rich2005 - 03-11-2021
I use linux, no 'Apple-anything' so no comment on the hardware, however from that article about viewing in different applications
Quote:If the monitor is not close to sRGB, such as wide gamut units, this won't work. Then you must have full color management.
and a look at mac monitor calibration https://photographylife.com/how-to-calibrate-apple-mac-monitor
Do you have one of those wide-gamut displays ? Do you have a monitor profile ie. 'something.icm' to feed into the Gimp color management settings?
Try asking the question on https://discuss.pixls.us/ more chance there of someone with comparable hardware.
...packing in for the night, so bye...