simple LUT parser
Cube format based on https://github.com/thibauts/parse-cube-lut/blob/master/index.js
or the spec at https://wwwimages2.adobe.com/content/dam/acom/en/products/speedgrade/cc/pdfs/cube-lut-specification-1.0.pdf
simple LUT parser
Cube format based on https://github.com/thibauts/parse-cube-lut/blob/master/index.js
or the spec at https://wwwimages2.adobe.com/content/dam/acom/en/products/speedgrade/cc/pdfs/cube-lut-specification-1.0.pdf