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Bilinear or Bicubic for exported PNGs in Affinity Designer


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6 minutes ago, nullpointer said:

I'm exporting PNG's in AD that will be printed on Amazon t-shirts and I'm curious which resample I should export for best results, bicubic or bilinear?

In general bicubic will give slightly better/sharper results than bilinear. 

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9 minutes ago, nullpointer said:

I'm exporting PNG's in AD that will be printed on Amazon t-shirts and I'm curious which resample I should export for best results, bicubic or bilinear?

Isn't it better to export and evaluate the results visually? If there was only one right choice, why would the others exist and be used? Why not use Lanczos, for example? So it always depends on the type of content you export.

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Here's a simple test, a canvas 4000 x 3000px with a linear gradient was exported to 800 x 600 for each resampling algorithm. The results were stacked, each layer set to Difference. If you select any two the screen is black so I suggest that you use nearest neighbour as it's the quickest

sampling.afphoto

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29 minutes ago, nullpointer said:

I'm not sure I follow the logic.

If you stack a couple of images, set the blend mode of the top one to Difference you will see the differences between the two images. If the display is black it indicates that there are no differences, also refer to the histogram. So my example shows that there are no differences between the algorithms in which case use any. Nearest Neighbour is the simplest and quickest so you might as well use that. For a continuous tone image like a photo' I would never use NN, I regard it to be as useless as the bmp file format but in this case going from a vector shape then it works. Try it for yourself with one of your typical images

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