bugGNUstep - Bugs: bug #14967, images with alpha, sometimes have...


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bug #14967: images with alpha, sometimes have color corruption

Submitted by:  Rob Burns <rburns>
Submitted on:  Sun Nov 13 13:30:49 2005  
Category: Gui/AppKitSeverity: 3 - Normal
Item Group: BugStatus: None
Privacy: PublicAssigned to: None
Open/Closed: Closed

Wed Apr 16 22:07:54 2014, comment #4:

I do not experience such problems since a long time, without example code or an openly available application, it can't be reproduce. In case, please reopen the bug.

Riccardo Mottola <rmottola>
Project Member
Sun Nov 30 21:46:44 2008, comment #3:

Does this problem still exist? In the meantime I changed some of the image handling, especially for the art backend and perhaps this improved this scaling artefact.

To reproduce the problem locally I would need your full application code, at least the part drawing the table.

Fred Kiefer <FredKiefer>
Project Member
Mon Nov 21 13:50:37 2005, comment #2:

I am using the art backend. The image is fairly small (16 pixels I think), but the tableColumn it is placed in is slightly smaller than that. I don't do any scaling directly. The code I use for displaying it is below.

When I open it up in Preview.app on my machine, it still has a green border.


- (id) tableView: (NSTableView *) aTableView
objectValueForTableColumn: (NSTableColumn *) aTableColumn
row: (int) rowIndex


if( [[aTableColumn identifier] isEqualToString: @"Flag"])
if([[cards objectAtIndex: x] learned] == YES)
return [NSImage imageNamed: @"Star.tiff"];
if([[cards objectAtIndex: x] slot] != NOSLOT)
return [NSImage imageNamed: @"Scheduled.tiff"];
return nil;

Rob Burns <rburns>
Mon Nov 21 13:08:18 2005, comment #1:

I loaded the image into a GNUstep image view application with different backends, but could not reproduce the problem. Which backend are you using and does the problem show up at all scales? Maybe it is a scaling glitch in xlib or art?

Fred Kiefer <FredKiefer>
Project Member
Sun Nov 13 13:30:49 2005, original submission:

attached are two screenshots. One from gnustep, and one from osx. Both are displaying a small star image. on the gnustep screenshot you can see that the edges of the star are tinted green. The osx screenshot displays the star in its correct colors. You can also see that the clock image (also with a transparent background) doesn't appear to be affected.

Rob Burns <rburns>


Attached Files
file #2686:  Star.tiff added by rburns (1kB - image/tiff - the tiff file used in both screenshots)
file #2685:  stars.tiff added by rburns (33kB - image/tiff - gnustep and osx screenshots)


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -unavailable- added by rmottola (Posted a comment)
  • -unavailable- added by FredKiefer (Posted a comment)

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    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Wed Apr 16 22:07:54 2014rmottolaOpen/ClosedOpen=>Closed
    Sun Nov 13 13:32:47 2005rburnsAttached File-=>Added Star.tiff, #3101
    Sun Nov 13 13:30:49 2005rburnsAttached File-=>Added stars.tiff, #3100

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