GEGL Extracts the brightness channel from an image and colorizes and blurs it. This filter was inspired by Gimp/GEGL's "Bloom" and Pixelitor's "Extract channel" filter. It shows that GEGL has the ability to extract channels for non-destructive editing with blend modes.
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Filter requires an alpha channel
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It is highly recommended you use the blend mode addition.
3.Gimp's layer blend modes will support an external glow effect on transparency. GEGL's layer blend modes will NOT support an external glow effect on transparency.
Here is a preview of me using the filter with Gimp's layer blend modes correctly to get an external glow effect.
Windows C:\Users<YOUR NAME>\AppData\Local\gegl-0.4\plug-ins
Linux /home/(USERNAME)/.local/share/gegl-0.4/plug-ins
Linux (Flatpak) /home/(USERNAME)/.var/app/org.gimp.GIMP/data/gegl-0.4/plug-ins
Windows C:\Users\USERNAME\AppData\Local\gegl-0.4\plug-ins
Linux /home/(USERNAME)/.local/share/gegl-0.4/plug-ins
Linux (Flatpak) /home/(USERNAME)/.var/app/org.gimp.GIMP/data/gegl-0.4/plug-ins
To compile and install you will need the GEGL header files (libgegl-dev
on
Debian based distributions or gegl
on Arch Linux) and meson (meson
on
most distributions).
meson setup --buildtype=release build
ninja -C build
If you have an older version of gegl you may need to copy to ~/.local/share/gegl-0.3/plug-ins
instead (on Ubuntu 18.04 for example).
The easiest way to compile this project on Windows is by using msys2. Download and install it from here: https://www.msys2.org/
Open a msys2 terminal with C:\msys64\mingw64.exe
. Run the following to
install required build dependencies:
pacman --noconfirm -S base-devel mingw-w64-x86_64-toolchain mingw-w64-x86_64-meson mingw-w64-x86_64-gegl
Then build the same way you would on Linux:
meson setup --buildtype=release build
ninja -C build