JPEG artifacts at 100%

[ATP]

I have a problem with many exports I do from Affinity Photo.

JPEGs (atleast I haven't noticed in other formats) almost always have these line artifacts for me.

Notice in the middle there's a line artifact, this often happens even at 100% with default JPEG settings.

[Joachim_L]

Any difference turning hardware acceleration on or off in Preferences >> Performance?

[ATP]

1 hour ago, Joachim_L said:

Any difference turning hardware acceleration on or off in Preferences >> Performance?

This happens in both modes, the exact same artifact in the same place. All settings are as before, standard JPEG settings with the quality slider at 100%. For me these artifacts are quite bad as they're pretty visible in the picture when zooming in.

Attached are the artifacts in a new place, where a horizontal and a vertical artifact intersect. Again, this happens in all pictures if you search for it.

[carl123]

1. Can you upload an APhoto document where this occurs when it's exported to JPG. We can then determine if it is just you or a wider issue.

2. In Preferences > Performance switch off Hardware Acceleration and switch your renderer to Warp and see if it does it then. This will help narrow down the problem also

[Joachim_L]

I tested myself and have no artifact. Could you upload a sample file before exporting to JPG?

[ATP]

This is humiliating, I've looked closer at the original picture and found the actual culprit!

Windows Photos, the default photos app on Windows 10, is creating the artifacts. This is unfortunately why I've always given Affinity the fault as I don't look at the photos before an export in the Windows Photos app, only after.

I'm sorry for having wasted your time as it wasn't an Affinity fault, but at least the software that actually created the artifacts has been found.