Preparing subpixel scaled images.

[mcbp223]

To go along with the subpixel drawing primitives in the library, we can use background images scaled down to subpixel level, with the help of ImageWorsener, by Jason Summers.

Here are some images taken from the internet (copyrights may apply), scaled down to 240x240.

For comparison, downscaled with and without subpixel rendering, both using Lanczos filter.
imagew -S 240,240 -depth 5,6,5 -offsetrb 1/3 -filter lanczos <source> <dest>

Test pattern images:

Digital fulldome test pattern by Paul Bourke.

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I've uploaded a Python script here to help with conversion into C-style arrays, rgb565 byte swapping and vertical flip.

[Bodmer]

Thanks for that.