Thanks for posting it here
two more informations:
1) delaboratory is not going to replace Gimp, Gimp is fully featured editor, delaboratory is just a color correction tool, there are many examples of bad applications in Free Software / Open Source world, but Gimp is not one of them, IMHO the only problem of Gimp is its current development process, so instead forcing my ideas in Gimp I decided to create separate application - and as you can see it was a good decision
2) I already discussed idea of using G'MIC in delaboratory with Ronounours (David Tschumperlé), we use similar data format (floats), I mainly understand how filters are defined, I don't expect any strange GUI requirements