AndreKR

That worked. 👍

Sure, here you go. 2020-07-16-22-42-22.mp4

Unfortunately that didn't fix the issue. Here's the new file. You can see the layer is now exactly 22px high but it still shows the same anomaly when flattening. problem.afphoto

I'm getting the exact same problem with the Threshold Adjustment (thanks for that, didn't know it). It seems to be a flattening problem, not a problem of the Levels/Threshold: 2020-07-16-20-10-52.mp4

I have attached an Affinity Photo file. I am trying to copy or export exactly what I see there, so basically this: just not zoomed. But whenever I do "Copy Flattened" or "Export..." I get this: which is different. (Note the additional black around the ear for example.) When I set zoom to 100% and take a screenshot, I get this where the rightmost pixels are missing/replaced with the gray surrounding. I don't know what else to try. problem.afphoto

That also snaps to the edges between pixels, unless you set Spacing to 1px and Divisions to 2, in which case it snaps at both, the center and the edge of the pixels. (That's how I made the second screenshot.)

Here's an example of two shapes with a 1px stroke (center aligned by default), drawn with Force pixel alignment on and shown with Pixel view mode on and with a 1px grid: In these cases it would be desirable if Force pixel alignment would snap to the center of the pixels:

I don't understand where you're going with the grid. How would I set up a grid that is exactly at the positions where the points would be spaced out? I could just as well create three objects, space them out, put make them snapping candidates and then snap the points to them. But still, that would be much more effort than spacing out the points. How can I deselect the shapes, so that I can space out only the selected points?

I have three rectangles. I converted them to curves to be able to select the corner points. Now I would like to space them equally. When I press "Space Horizontally", I get the result you can see in the second image.