This is a proof-of-concept GIMP plug-in that creates a Photoshop-like color adjustment layer in GIMP 2.8.
This is highly experimental. Use at your own risk. Comments and improvements are welcome.
A recent version of Scipy and Numpy is required (note that GIMP uses the old Python 2.7, so use pip2.7 to install).
After installing the plug-in, check the menu option "Layer -> Fake adjustment".
The black point, white point and gamma settings are identical to the Color Levels dialog.
More documentation might come eventually. This blog post explains how the plug-in works.
GIMP fake adjustment layer plug-in is Copyright (C) 2018 Tomaž Šolc tomaz.solc@tablix.org
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/