Editing challenge

Old Bruce · February 4, 2026 at 7:50 PM

Here is a tiny document that explains what I was on about the x, y co-ordinates and also about scaling. One is 16 px square and is placed in 64 px square document so you'll have to enlarge the zoom magnification. The upper left is at integer x, y co-ordinates the upper right is at fractional pixel x, y co-ordinates. The next two have been scaled to 17 x 17 pixels and placed at integer pixel x, y co-ordinates and on the right at fractional pixel x, y co-ordinates.

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Also view using Pixel view instead of Vector view.

nickbatz · February 4, 2026 at 9:14 PM

Quote from Old Bruce

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Bruce, my understanding is that all of that goes away if you select resampling when you upscale. I change everything to 300dpi, and I've found Lanczos to look the best.

bici · February 4, 2026 at 9:38 PM

Quote from nickbatz

Bruce, my understanding is that all of that goes away if you select resampling when you upscale. I change everything to 300dpi, and I've found Lanczos to look the best.

Please elaborate on "if you select resampling when you upscale" and what is "Lanczos"

thanks

nickbatz · February 4, 2026 at 10:37 PM

Quote from bici

Please elaborate on "if you select resampling when you upscale" and what is "Lanczos"
thanks

Upscale = increase the dots per inch to a higher number, in my case 72 [iPhone images] to 300. In theory it doesn't do anything to the image itself, just the display, but if you resample then it's not the same.

Resampling interpolates data between the new dots being created, solving the problem Bruce is describing. There are various algorithms for doing that, and they have different results.

In Affinity Photo 2, go to Document-> Resize Document and you'll see the parameters. It's worth experimenting with the different resampling algorithms.

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