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So I just had a look around the forum and it might really be that you group together 4 pixels to one according to the bayer filter to speed things up. I actually wonder what that does for performance on a dedicated, modern gpu. I mean you need to read the data anyways, you calculate an average brightness and color depending on those four numbers. The only step you'd need to add would be to correct the brightness of each monitor pixel depending on the actual subpixel. i think sharpness would increase considerably. The next step would of course be to add some kind of usm to the brightness channel, and i can see how that could slow it down.
On the other hand, I am using a 1080ti and the gpu usage tops at 5% when zooming or changing to another picture.
Personally, I would love to see some changes to these algorithms, but I think I can manage for the time being with screen usm and focus peaking.
Thank you very much for this nice software!