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Hi @henryg,
Welcome to Affinity Forums :)
No, there's no point in upscaling unless you really need a bigger image/output. Any downscaling or upscaling always affects image quality negatively because you are either interpolating or removing pixels from the original image which affects its sharpness/definition. If you really have to upscale use a proper resampling algorithm (depends on the type of image) to get a better result.

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  • 2 weeks later...

The appropriate algorithm doesn’t really depend on the file format (e.g. JPEG, PNG, or TIFF). Generally speaking, bilinear or bicubic resampling is adequate for downscaling but Lanczos3 (separable or non-separable) is better for upscaling.

When choosing a file format for export, what’s important is the type of image; i.e. whether it’s a photograph or a graphic comprising large areas of solid colour, with or without text. Even a small amount of JPEG compression will introduce artefacts at the boundary between blocks of solid colour, an effect which is especially noticeable around the edges of any text in the image.

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Affinity Designer/Photo/Publisher 2 for Windows • Windows 10 Home/Pro
Affinity Designer/Photo/Publisher 2 for iPad • iPadOS 17.3.1 (iPad 7th gen)

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3 minutes ago, henryg said:

Any guidance on when to use Lanczos3 separable or non-separable? Googling didn't come up with anything much.

21 hours ago, Alfred said:

The appropriate algorithm doesn’t really depend on the file format (e.g. JPEG, PNG, or TIFF). Generally speaking, bilinear or bicubic resampling is adequate for downscaling but Lanczos3 (separable or non-separable) is better for upscaling.

Upscaling means enlarging.

Mac Pro (Late 2013) Mac OS 12.7.2 
Affinity Designer 2.3.1 | Affinity Photo 2.3.1 | Affinity Publisher 2.3.1 | Beta versions as they appear.

I have never mastered color management, period, so I cannot help with that.

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11 hours ago, henryg said:

Any guidance on when to use Lanczos3 separable or non-separable? Googling didn't come up with anything much.

 

To save time I am currently using an automated AI to reply to some posts on this forum. If any of "my" posts are wrong or appear to be total b*ll*cks they are the ones generated by the AI. If correct they were probably mine. I apologise for any mistakes made by my AI - I'm sure it will improve with time.

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