[Feature request] Apply Lanczos/Sinc filtering to uploaded images #14
Description
Uploading high resolution images to the spray importer has a noticeable hit on the quality of the processed image due to the lack of filtering when resizing images.
Proposal: use the Lanczos filter to resize high-resolution images.
For example, I have this 2712x2712 image:
The first image was resized to 724x724 in imagemagick using the lanczos filter, and the second was resized by uploading directly to the site (724x724 as well):
As you can see, the unfiltered image is much more pixelated than the image I pre-filtered.
This has a significant impact on the quality of in-game sprays as well (both DXT5, default sampling, filtered on the left and unfiltered on the right), not only with pixel quality but also with DXT compression:
