Bug 273288 - Filter - Color to Alpha... does not work
Summary: Filter - Color to Alpha... does not work
Status: RESOLVED WORKSFORME
Alias: None
Product: krita
Classification: Applications
Component: Filters (show other bugs)
Version: 2.3
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: Krita Bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2011-05-14 19:50 UTC by Frederik Gladhorn
Modified: 2011-12-28 11:41 UTC (History)
4 users (show)

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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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