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Bug 702699 - value invert and invert have different result on grayscale images
value invert and invert have different result on grayscale images
Status: RESOLVED FIXED
Product: GIMP
Classification: Other
Component: General
git master
Other All
: Normal normal
: 2.10
Assigned To: GIMP Bugs
GIMP Bugs
Depends on:
Blocks:
 
 
Reported: 2013-06-19 22:29 UTC by immanuel
Modified: 2013-06-24 09:07 UTC
See Also:
GNOME target: ---
GNOME version: ---

Attachments
shows the issue (132.20 KB, image/png)
2013-06-19 22:29 UTC, immanuel 		Details

Description immanuel 2013-06-19 22:29:43 UTC 
Created attachment 247294 [details]
shows the issue

This can be easyly shown with a gradient black --> white
Applying "value invert" shows equally distributed bars in the histogram.
Applying "invert" shows a strange non-linear distribution (gamma 2.2 doesn't really fit)

On 2.8.4 it works as expected.
Comment 1 Michael Natterer 2013-06-24 09:07:47 UTC 
This got fixed by using the new gegl:invert-gamma operation:

commit f56f6d125563ca2ad5eb5663b39ba0ff2f22f038
Author: Michael Natterer <mitch@gimp.org>
Date:   Mon Jun 24 00:45:04 2013 +0200

    app: follow the GEGL invert -> invert-linear vs. invert-gamma change
    
    and invert masks using invert-linear and other drawables using
    invert-gamma. drawable_invert_cmd_callback() still always uses
    invert-gamma even though it can be used on layer masks.