ofxGpuLutCube

openFrameworks addon to apply LUT (Color Lookup Table) filters with a GPU shader using standard .cube files. (sizes 16, 32, 64)

All process is done live and fast into the GPU

It's faster than other alternatives that use the CPU. (like the bundled openFrameworks\examples\graphics\lutFilterExample)

Inspired from: https://github.com/yasuhirohoshino/ofxGpuLut that does the almost same GPU process but with special .png files.

An useful Windows-only free app to batch convert and create LUT files: https://grossgrade.com/

Screenshots

Usage

ofApp.h

#include "ofxGpuLutCube.h"

ofxGpuLutCube GpuLutCube;

ofApp.cpp

//setup()
GpuLutCube.setup();

//update() or draw()
GpuLutCube.begin();
{
    //draw and feed your scene here
}
GpuLutCube.end();

//draw()
GpuLutCube.draw();

//gui
GpuLutCube.drawGui();

//help
GpuLutCube.drawHelp();

//helper methods
GpuLutCube.loadNext();
GpuLutCube.loadPrevious();
GpuLutCube.loadLut(int i);
GpuLutCube.loadRandomize();

Features

• Browsing LUT files folder using GUI or keys.
• Easy integration into your ofApp with an ofParameterGroup and an ofxGui panel
• Float parameter to set filter mix/dry.
• Int parameter to select LUT index.
• String parameter to show LUT name.
• Included example with /data/ files (291 .cube files + shader files).(Remember to include /data files!)
• Two testing images. Left/Right keys to select images.

Tested system

• OF 0.11
• Visual Studio 2017

About

Addon modifications by MoebiusSurfing https://github.com/moebiussurfing

Based on and using the code of HUBRIS: https://github.com/youandhubris/GPU-LUT-OpenFrameworks https://forum.openframeworks.cc/t/gpu-lut-photoshop/18070

BY HUBRIS [http://cargocollective.com/hubris] [http://github.com/youandhubris]

THANKS to @johanjohan: https://github.com/johanjohan to point me to this source here: https://github.com/yasuhirohoshino/ofxGpuLut/issues/3

pow2 snippet from @johanjohan.

THANKS to: https://github.com/yasuhirohoshino for the original https://github.com/yasuhirohoshino/ofxGpuLut

TODO:

• Set custom draw position and size (x, y, w, h).
• A better solution to realtime vertical flip that sometimes happens.
• To not use internal FBO or add getter/setter to use by reference.
• A faster loader of files, threaded or cache some files.
• Settings to store/load LUT by name.
• .cube files browser system and thumbs maybe with ofxImGui.

PLEASE FEEL FREE TO ADD MODIFICATIONS/ISSUES/FEATURES AND TO SEND ME PULL REQUESTS

License

MIT License.