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Bug 795957 - Lab/YUV color selector is broken
Lab/YUV color selector is broken
Status: RESOLVED OBSOLETE
Product: GIMP
Classification: Other
Component: Tools
2.10.0
Other Windows
: Normal normal
: ---
Assigned To: GIMP Bugs
GIMP Bugs
Depends on:
Blocks:
 
 
Reported: 2018-05-08 22:22 UTC by Ulrich.Windl
Modified: 2018-05-24 19:52 UTC
See Also:
GNOME target: ---
GNOME version: ---


Attachments
Screen shots of three color selectors, GIMP on the second row is broken (90.81 KB, image/jpeg)
2018-05-08 22:22 UTC, Ulrich.Windl
Details

Description Ulrich.Windl 2018-05-08 22:22:15 UTC
Created attachment 371823 [details]
Screen shots of three color selectors, GIMP on the second row is broken

The third tab of the color selector that displays a Lab or UV-like color space is broken:
When I click a color, the numbers on the right update, but not the color below.
Also the vertical slider has no effect at all. I think that should control brightness of the UV/ab colorspace.
For comparison I'll attach a selection of three screen shots that show a working color selector (at two brightness levels) and the broken GIMP color selector for reference.
Comment 1 Elle Stone 2018-05-09 00:25:09 UTC
(In reply to Ulrich.Windl from comment #0)
> Created attachment 371823 [details]
> Screen shots of three color selectors, GIMP on the second row is broken
> 
> The third tab of the color selector that displays a Lab or UV-like color
> space is broken:

I'm not sure what you mean by "Lab or UV-like color space". But you are right, the vertical slider doesn't seem to do anything.

> When I click a color, the numbers on the right update, but not the color
> below.

Well, I do see an update in the color below - if I select a yellow color and then keep clicking in the red area, the yellow ("current") color gets progressively more red.

If you want the vertical slider to control "lighter and darker" try clicking on the first tab and then click HSV and select the Value slider. Or  else click on the first tab and click LCh and select the Lightness slider. Then the vertical slider will control making the color lighter or darker. 

> For comparison I'll attach a selection of three screen shots that show a
> working color selector (at two brightness levels) and the broken GIMP color
> selector for reference.

Look here for an explanation of the third tab:
https://docs.gimp.org/2.10/en/gimp-dialogs-content.html#gimp-color-dialog

Apparently its name is "Watercolor Color Selector". It probably isn't supposed to act like the other tools that you are trying to compare it to. The idea is that you select a color using one of the other tabs. Then you can modify the color to make it move slightly towards some other color, by clicking that other color. And the current color does update.

If you scroll around the watercolor color selector instead of just clicking on the same color, the Lightness/Value keep getting darker and darker, which seems a little strange.
Comment 2 Ulrich.Windl 2018-05-09 07:09:05 UTC
The main problem is that the icons for the tabs are too tiny to get what they mean, and there is no "hover information" for them. Despite of the topics mentioned already, one might also have a look at the more realistic "palette mixer" that can be seen at the right of attachment 371822 [details]:
You have a color picker that "loads a color to the brush", and then you can paint with the brush on the palette, possible over some existing color to mix it.
I think it's more intuitive, but probably also more challenging for the implementer.
Comment 3 Elle Stone 2018-05-09 15:34:15 UTC
This page explains the purpose of the vertical slider in the watercolor selector:

http://takingnothingforgranted.com/coloring-gimp-part-1-color-selection-dialog/

It says the vertical slider controls the "rate of each click's saturation". So it appears that the watercolor selector does work exactly as intended. 

(In reply to Ulrich.Windl from comment #2)
> The main problem is that the icons for the tabs are too tiny to get what
> they mean, and there is no "hover information" for them. 

This "lack of "on hover" information affect all the tabs in the Select Foreground dialog - maybe this bug report could be "repurposed" as a bug report on the lack of on-hover tips for the tabs.

To "repurpose" this bug report, change the subject line as appropriate and reiterate the lack of "on hover" tips to let the user know what each tab is for. Without "on hover" text, it's hard to even know what to search for to get more information.

The small icons is a separate issue. You could ask about the icon size on the gimp-gui mailing list: https://mail.gnome.org/mailman/listinfo/gimp-gui-list

If you don't want to repurpose this bug report, then probably it would be best to just close it as "not a bug".

> Despite of the
> topics mentioned already, one might also have a look at the more realistic
> "palette mixer" that can be seen at the right of attachment 371822 [details]:
> You have a color picker that "loads a color to the brush", and then you can
> paint with the brush on the palette, possible over some existing color to
> mix it.
> I think it's more intuitive, but probably also more challenging for the
> implementer.

This would be an enhancement request, and so should go in a separate bug report.
Comment 4 GNOME Infrastructure Team 2018-05-24 19:52:33 UTC
-- GitLab Migration Automatic Message --

This bug has been migrated to GNOME's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.gnome.org/GNOME/gimp/issues/1435.