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Unexpected Artifacting with Unmerged Transparency When Downsizing Image in File>Export using Lanczos NS


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Well, this is an unexpected nuisance.

In this file there is a layer for corrections around the mouth (lots of food crumbs). The first image is as it should look, but when using Lanczos Non-Separable in File>Export for Resampling Method and exporting to a smaller size (in this case 33.3%), the lines are visible.

As it should appear:
image.thumb.png.ae1eaaee8b7ac06ccfd5d51bf80a97f1.png

Vs... File>Export[Resize 33.3%] with Lanczos Non-separable as the Resambple option with NO merged layers):
image.png.c009d7bbea3dca5731c262b015d9c93d.png

On one hand, this probably means that the individual layers are resampled using the method we chose in the File>Export window? This is good because we need this level of control. The downside?: It creates artifacting that can be seen around the edges of a layer that has transparency (so heal brush work and so on...) when using the sharpest option from what I can tell is Lanc Non-Separable for downsizing...

The "fix" is to use Merge Visible before exporting and that way there's no layers in which to create edges around... a bummer.

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7 hours ago, debraspicher said:

Well, this is an unexpected nuisance.

In this file there is a layer for corrections around the mouth (lots of food crumbs). The first image is as it should look, but when using Lanczos Non-Separable in File>Export for Resampling Method and exporting to a smaller size (in this case 33.3%), the lines are visible.

As it should appear:
image.thumb.png.ae1eaaee8b7ac06ccfd5d51bf80a97f1.png

Vs... File>Export[Resize 33.3%] with Lanczos Non-separable as the Resambple option with NO merged layers):
image.png.c009d7bbea3dca5731c262b015d9c93d.png

On one hand, this probably means that the individual layers are resampled using the method we chose in the File>Export window? This is good because we need this level of control. The downside?: It creates artifacting that can be seen around the edges of a layer that has transparency (so heal brush work and so on...) when using the sharpest option from what I can tell is Lanc Non-Separable for downsizing...

The "fix" is to use Merge Visible before exporting and that way there's no layers in which to create edges around... a bummer.

This problem also exists in Affinity Designer 2.2. Antialising when exporting JPG and PNG is not optimal, especially with typography, round letterforms. This has been reported here in the forum several times. Unfortunately, Serif has not yet done anything to improve this.

https://forum.affinity.serif.com/index.php?/topic/186456-affinity-210-better-antialiasing-required/#comment-1097044

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Hi debraspicher,

Would you be able to provide a copy of the file along with steps I can follow to replicate this problem so I can log this with our developers to be improved in a future update? You should be able to upload it to the following link: https://www.dropbox.com/request/6PG64Z95ib7DD45kZvUe

Thanks
C

Please tag me using @ in your reply so I can be sure to respond ASAP.

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la stessa cosa vale per l'esportazione del jpeg per la stampa dopo aver aggiunto dettaglio, se verificate l'anteprima di esportazione il file è privo del dettaglio e nella stampa non è presente.  Vale per chiarezza, accentua passaggio e Maschera di Nitidezza. Verificate

   

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On 10/11/2023 at 5:47 AM, Callum said:

Hi debraspicher,

Would you be able to provide a copy of the file along with steps I can follow to replicate this problem so I can log this with our developers to be improved in a future update? You should be able to upload it to the following link: https://www.dropbox.com/request/6PG64Z95ib7DD45kZvUe

Thanks
C

I uploaded some files, as well as screenshot of the export settings. Thanks for getting back to me quickly, @Callum

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This has been reported before. Would be a surprise if Affinity says anything else than „works as designed“.

On 10/11/2023 at 1:56 AM, debraspicher said:

On one hand, this probably means that the individual layers are resampled using the method we chose in the File>Export window? This is good because we need this level of control.

Exactly this happens.

On 10/11/2023 at 1:56 AM, debraspicher said:

The downside?: It creates artifacting that can be seen around the edges of a layer that has transparency (so heal brush work and so on...) when using the sharpest option from what I can tell is Lanc Non-Separable for downsizing...

Yes again. The older reported was simply downscaling at export (no matter what resample method) to get artifacts.

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