Bug 273288

Summary:	Filter - Color to Alpha... does not work
Product:	[Applications] krita	Reporter:	Frederik Gladhorn <gladhorn>
Component:	Filters	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	animtim, cberger, halla, pentalis
Priority:	NOR
Version First Reported In:	2.3
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Frederik Gladhorn 2011-05-14 19:50:35 UTC

Version:           2.3 (using KDE 4.6.2) 
OS:                Linux

Other filters show a preview and work on the current layer.
Color to Alpha does not seem to do anything. No matter what I try I could not get it to work on a layer where I accidentally had a white background instead of a transparent one.
I tried with a selection or without.

Reproducible: Always

Comment 1 Cyrille Berger 2011-06-15 08:53:29 UTC

Did you select a threshold value different than 0 ?

Comment 2 pentalis 2011-10-17 00:19:14 UTC

The filter now works, but I'm not sure if it behaves as intended (I like the GIMP Color-to-Alpha behavior more).

Also, this won't work as a filter layer or a filter mask. This is the case with any filter that generates alpha instead of a colored result.

Should we close this bug?.

Comment 3 Halla Rempt 2011-10-17 07:35:55 UTC

Hm... What's the exact difference? The filter isn't very complicated. The preview thing is very annoying, but we need a new composite op for that which can be used by default with masks.

Comment 4 animtim 2011-12-09 13:05:50 UTC

Hi,
Now the color to alpha filter from menu works, excepts that when I apply it, it produces random pixels artefacts all over, although the preview looks ok before I apply.

This filter applied using filter mask or layer works ok (so current workaround is to use one of those and flatten layer).

Comment 5 Sven Langkamp 2011-12-27 21:08:36 UTC

Works here. Can you check if you can still reproduce the bug?

Comment 6 animtim 2011-12-28 08:43:56 UTC

Works here now too, I can't reproduce anymore.


2011/12/27 Sven Langkamp <sven.langkamp@gmail.com>

> https://bugs.kde.org/show_bug.cgi?id=273288
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> --- Comment #5 from Sven Langkamp <sven langkamp gmail com>  2011-12-27
> 21:08:36 ---
> Works here. Can you check if you can still reproduce the bug?
>
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