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Feature Request: Support Asinh and/or Log functions in the procedural texture filter


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Asinh stretching (hyperbole arcsine) is a common practice in astrophotography workflows to extract data from a stacked linear image. I was hoping to be able to use the procedural texture filter functions to asinh stretch my images in Affinity Photo, but it seems the required functions aren't supported (see https://affinity.help/photo/English.lproj/index.html?page=pages/Filters/filter_proceduraltexture.html?title=Procedural Texture).

Since the asinh function could be manually recreated with Log functions, I'd request either of the two functions to be supported. Thanks!

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