ofx3jGpuLutCube is loading widely used .cube luts for image processing and color grading with a LUT_3D_SIZE that is a pow2 (16, 32, 64). Luts with other LUT_3D_SIZE may be batch converted with https://grossgrade.com/en/ or similar tools beforehand.
based on https://github.com/youandhubris/GPU-LUT-OpenFrameworks BY HUBRIS PORTO · DECEMBER 2014
inspired by this discussion yasuhirohoshino/ofxGpuLut#3 which obviously spawned one more addon by @moebiussurfing https://github.com/moebiussurfing/ofxGpuLutCube published at the identical moment
cube lut specs: https://wwwimages2.adobe.com/content/dam/acom/en/products/speedgrade/cc/pdfs/cube-lut-specification-1.0.pdf