667850 - Severe aliasing in resized images

Status: RESOLVED DUPLICATE of bug 486918

(Core :: Graphics: ImageLib, defect)

Description

[Roman]

Attachment: Comparison of proper filtering and Firefox's filtering

As described in bug 98971, Firefox does *some* filtering on the images it resizes. However, in my opinion, it is far from adequate. Firefox still shows severe aliasing when shrinking images.

Steps to reproduce the attached image:
- go to http://apod.nasa.gov/apod/ap101029.html
- hold Ctrl+- until the zoom limit is reached

Comment 1

[Roman]

Attachment: Proper bilinear filtering, vs. Firefox's filtering

Attachment shows that even bilinear filtering is much better than what Firefox does.

Comment 2

[Jo Hermans]

bug 98971 is for *upscaling*, not downscaling. It uses bilinear filetring.

Downscaling uses nearest neighbor as far as I know, except on Android (bilinear if hardware acceleration is available).

I think this is a dupe of bug 372462 or bug 486918, but there are so many similar bugs out there, that it's not easy to see which is the best to choose.