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Antialiasing an NSImage on macOS

Forums > macOS

Hello Everyone,

Recently, I started lerning Swift using Paul's great app and the book "Hacking with macOS". In project 7 - Photo Memories - images are loaded from files on the harddisk to NSImages. These are then displayed in a collection view and also rendered to a video slideshow. I like the project a lot, but I'm having one problem:

The thumbnails as well as the output video show quite a lot of aliasing artefacts (jagged corners and hard noise). This seems to be due to the fact that my input images are larger than the images as displayed and as rendered to the video. It seem that the downscaling that is done internally is done by simple subsampling - which introduces aliasing - instead of a proper low pass filtering.

How can I tell the NSImage to use an antialiasing/blurring/low pass filter prior to resizing and displaying the images?

Thanks for your help and cheers, Patrick


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