Reply to topic

which RGB Color profile to choose???

User avatar francescobona
Registered Member
Posts
25
Karma
0

which RGB Color profile to choose???

Sun Apr 19, 2015 12:09 am
Hi, I have tried to answer this question by reading tutorials, official manual, and guides but did not work:
How do I know which RGB profile should I choose if I don't understand their names? I'm very confused..
I see:
AllColorsRGB-elle-V2-g10.icc
AllColorsRGB-elle-V2-srgbtrc.icc
AllColorsRGB-elle-V4-g10.icc
AllColorsRGB-elle-V4-srgbtrc.icc
CIERGB-elle-V2-g10.icc
CIERGB-elle-V2-g22.icc
CIERGB-elle-V2-srgbtrc.icc
CIERGB-elle-V4-g10.icc
CIERGB-elle-V4-g22.icc
etc ...
What does it mean ClayRGB???? CIERGB???? Elle ???? g10? g22? srgbtrc???????????
I have always worked in photoshop with Adobe RGB or Prophoto - a single, simple and clear version of Adobe RGB and Prophoto profile ... Where are they?
Can you help me?
No explanation in the manual ...
User avatar Deevad
Registered Member
Posts
449
Karma
1
OS
I have always worked in photoshop with Adobe RGB or Prophoto - a single, simple and clear version of Adobe RGB and Prophoto profile ... Where are they?

It's certainly proprietary code, licensed by Adobe and Prophoto. If you own them with a license, you can probably retrieve the *.icc or color profile to work with Krita.
Where are they ? Krita developers can't bundle them : they are the propriety of a company and closed or copyrighted code.

How do I know which RGB profile should I choose if I don't understand their names?

For me, AllColorsRGB-elle-V2-g10.icc is *as* cryptic as Prophoto or AdobeRGB , maybe even less because their is more informations in the name.
But here, label can't help us ; I can only 'read' a color profile with an image graph, or spec ...

Can you help me? No explanation in the manual ...


Sure, It's not yet in official manual, but resources exist on the web. About Elle Stone ( the author of profiles ) profiles inclusion in Krita :
http://krita-foundation.tumblr.com/post ... -felt-like

Description of 'AdobeRGB' and 'Prophoto' here :
http://ninedegreesbelow.com/photography ... compatible
And to quote this page : http://ninedegreesbelow.com/photography ... files.html
"ClayRGB is made using the primaries, tone response curve and white point given in the specifications for the AdobeRGB1998 profile."
LargeRGB-yourname-V4-g18.icc. Functionally equivalent to ProPhotoRGB."
The website of Elle Stone is a gold mine about the subject. Enjoy !


User avatar TheraHedwig
KDE Developer
Posts
1793
Karma
10
OS
Yes, like deevad says, we can't ship adobe RGB and prophoto RGB(specifically, we're not allowed to ship files with Adobe RGB and Prophoto as names). However, Elle's profiles are made and tested by someone who knows what she's doing.

One of the changes I want to make is to have Krita know the colourants, and then make a widget that show the size of the space, but unless you know what prophoto's supossed to look like, that wouldn't help you either.
User avatar francescobona
Registered Member
Posts
25
Karma
0
I'm still a bit 'confused ..
I usually use Prophoto RGB in a 2.2 gamma environment with a D65 white point monitor calibration...
Following your indications I should choose something like LargeRGB D65 V4 g22 but ... This profile does not exist.
What should I choose?
Definitely.. The choice of the profile is one of the first things to do in krita.
I think it is absurd to not accurately explain the color profiles inserted. On what basis I make my choice?
For example, it would be useful to show the graphics of the color spaces.
To which graphical gamut/color space does corresponds:
- AllColorsRGB?
- CIERGB?
- ClayRGB?
- Gray-D50?
- IdentityRGB?
- krita25_lcms-builtin-sRGB?
- Lab-D50?
- LargeRGB?
- scRGB?
- sRGB?
- WideRGB?
User avatar TheraHedwig
KDE Developer
Posts
1793
Karma
10
OS
Here's Elle's own explaination in the readme: http://quickgit.kde.org/?p=calligra.git ... s%2FREADME

It doesn't seem Krita ships with a version of ProPhoto d65, and as far as I understand Elle's notes, this is because prophoto officially is supossed to deal with print, hence the d50 white point. Adobe RGB does have d65, even if it's smaller.

I think it is absurd to not accurately explain the color profiles inserted. On what basis I make my choice?

Well, the issue is that icc profiles themselves don't really know much beyond their gamma, whitepoint and collorants. You can however add your own profiles, you know? So if you press the blue file icon, you should get a browser window where you can navigate to and import a profile.
ICC profiles themselves are not hardcoded, but we can't ship ProPhoto without risking legal action from whoever made the ProPhoto profile.

For example, it would be useful to show the graphics of the color spaces.

That's something that, as I mentioned, is something I still want to do, but there's no real ETA on it.
User avatar Deevad
Registered Member
Posts
449
Karma
1
OS
TheraHedwig wrote:Here's Elle's own explaination in the readme: http://quickgit.kde.org/?p=calligra.git ... s%2FREADME

Fantastic README, very well documented.


User avatar francescobona
Registered Member
Posts
25
Karma
0
Thanks a lot!

 
Reply to topic

Bookmarks



Who is online

Registered users: Baidu [Spider], Bing [Bot], Google [Bot], leovae, rblackwell, Yahoo [Bot]