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Bug 145054 - Can't modify alpha channel with curves tool or levels tool
Can't modify alpha channel with curves tool or levels tool
Status: RESOLVED NOTABUG
Product: GIMP
Classification: Other
Component: Tools
unspecified
Other Linux
: Normal normal
: ---
Assigned To: GIMP Bugs
GIMP Bugs
Depends on:
Blocks:
 
 
Reported: 2004-06-27 18:06 UTC by weskaggs
Modified: 2004-12-22 21:47 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description weskaggs 2004-06-27 18:06:55 UTC 
This applies to 2.0.2 as well as 2.1.1.  If you bring up either the curves or
levels tool and try to adjust the alpha channel of an image, nothing happens to
the histogram and nothing happens to the image.
Comment 1 weskaggs 2004-06-28 17:32:39 UTC 
Follow-up:  I've tracked through this far enough to see that the right thing is
happening when gimp_lut_process is run -- for an RGB image, it uses case 4:, and
the values that come out for dest[3] are different than those for src[3]. 
Somehow, though, these changes do not take effect in the image.
Comment 2 Michael Natterer 2004-06-28 22:41:03 UTC 
Hm, strange. I tried the fix for bug #141930 on both GRAYA and RGBA
layers and thes worked nicely on the alpha channel.

Would you check if you can still reproduce the bug with CVS HEAD?
Comment 3 Simon Budig 2004-06-28 23:22:31 UTC 
Maybe the "keep transparency" toggle in the layers dialog is activated? or you
have a subtle selection somewhere?
Comment 4 weskaggs 2004-06-29 03:39:25 UTC 
It was "keep transparency", all right.  Sigh.  Just when I think I'm beginning
to understand this program . . .
Comment 5 Simon Budig 2004-06-29 08:57:49 UTC 
Will the wonders never cease...  :-)

Closing as NOTABUG