Thank you very much for the plugin! I’m using Krita 5.2.6 (git ab3502b) and I didn’t need step 3 to install the plugin: Krita itself asks if you want to activate the plugin after restarting… and when I reopened Krita, the plugin was already listed under “Scripts”.
I tested it with a file of 3200 x 1900 pixels. That’s the total size, with bleed (in the dark gray areas), and the crop area is 2560 x 1440 pixels. I wanted to divide the crop area into fifteen equal parts, both in width and height:
With this size I can draw grids for composition, like these:
And also to establish what Andrew Loomis called Focal Point:
