[Digikam-devel] [digikam] [Bug 281095] BQM AdjustCurve tool : curves adjustment doesn't work

[Gilles Caulier]

https://bugs.kde.org/show_bug.cgi?id=281095

--- Comment #17 from Gilles Caulier <caulier.gilles at gmail.com> ---
Marcel,

I just tested. There are two problems :

1/ In BQM, Adjust curves tool do not take effect on image when it's processed
as FREE mode. In SMOOTH mode no problem. To reproduce it's very simple : Load
few JPEG in BQM, assign curves adjust + PNG export tools, change curve settings
to reduce luminosity (just drop-down curve with one central point to the
bottom). In a first time use SMOOTH mode and look result. All is fine in target
image. Now, just switch mode from SMOOTH to DRAW. central point disappear.
Remove previous target PNG and run again the queue. Look the result : source
and target image have the same luminosity.

2/ In BQM, Convert to B&W produce black hole images when curve adjustments is
used. Use same queue context than 1/ and replace Adjust Curves tool  by Convert
to B&W. In B&W settings use Generic film + No Lens Filter + No Tone Filter.
Just go to Luminosity curve and drop-down curve in SMOOTH mode to reduce
luminosity. Run queue, and look the result : all target image are black holes.
Now switch curve from SMOOTH to FREE and run again the queue : All image are
converted to B&W but luminosity is not changed.

Gilles Caulier

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