gimp-anaglyph

gimp plugin to create and interactively edit red/cyan green/magenta anaglyphs

This is an interactive plugin to generate and edit red/cyan and green/magenta anaglyph with gimp.

Still a work in progress, it works but don't expect production quality, for instance, it still doesn't handle pixels vacated by displacement, it doesn't implemente color/half color or any optimized methods.

it just shift the red or the green component channel by an amount specified with: the maximum displacement value in the GUI spin button multiplied by the depth level in the depth map channel which is divided by 255 before and finally multiplied with the curve level edited with the GUI panel.

displacement = max * ( depth / 255 ) * curve factor

How it work:

open an image and select the background layer
menu Filters > Map > Anaglyph...
- the plugin will create one output layer and one depth channel and will make the depth channel active
- the GUI panel should remain opened and above other windows
- you can edit the source layer and the depth channel in any way you like
- just move the mouse over the do it label at the bottom of the GUI panel to update the output

Note: once the GUI show up and the channel and layer are created, the source the depth and the output are bounded with the current plugin instance, to create a new anaglyph with a different image the plugin must be closed and re-opened.

How to build:

checkout gimp repository
install cmake and libgimp2.0-dev (that's in Debian, your distro may use different name it must contain the gimp-2.0 include directory and the gimptool-2.0 command)
create a build dir, enter it, run cmake with the path to the checkout then make or make xinstall

the xinstall target will run gimptool-2.0 --install-bin which should copy the built plugin into your home gimp's plug-ins directory, make without xinstall will only build the plugin locally into the build directory therefore must be installed manually.

mkdir build/ && cd build && cmake [path of the checkout]
make [xinstall]

TODO:

handle vacated pixels
tile cache size editable within GUI panel (currently a size to cover the source layer, the depth channel and the output layer (+ the shadow) is allocated, bigger the image more the memory used)
look to half and optimized implementations
replace deprecated gtk2 widgets (like curve with a custom cairo implementation)
see if gimp plugin API allow to check and refresh dirty tiles (without user interaction with the GUI panel)
based on this plugin create a new one (not anaglyph) combining a source and a gradient with a depth channel (like Filters > Map > Gradient does, useful to fake thermal pictures)

xenogenesi/gimp-anaglyph

gimp-anaglyph