{"id":27,"date":"2012-06-22T17:38:35","date_gmt":"2012-06-22T17:38:35","guid":{"rendered":"https:\/\/blogs.scummvm.org\/singron\/?p=27"},"modified":"2022-05-23T17:41:08","modified_gmt":"2022-05-23T17:41:08","slug":"2xpm-scaler","status":"publish","type":"post","link":"https:\/\/blogs.scummvm.org\/singron\/2012\/06\/22\/2xpm-scaler\/","title":{"rendered":"2xPM scaler"},"content":{"rendered":"

Digitall recently pointed me towards some old patches on the patch tracker for scalers. There I found an old patch for the 2xPM scaler. It is a high quality scaler similar to hq2x. It took a few minutes to copy some files around and to change some variable names, but adding it was painless at first. When I tried to use it, the quality did not look as good as the screenshots I had seen previously. In particular the pattern in the source image:<\/p>\n

#|@|#\r\n#|#|@\r\n#|#|#<\/pre>\n
Would scale the center pixel to:<\/p>\n
#|@\r\n@|#<\/pre>\n
which made no sense and gave previously sharp edges strange dithering effects.<\/p>\n
So I compared the patch to the reference implementation it was based on and realized a few mistakes had been made in the copy-paste. The patch was never accepted, so it was probably never checked too thoroughly.<\/p>\n
After fixing that, picture quality improved dramatically. 2xPM is arguably better than hq2x. I have included some images that demonstrate the different scalers. The source image is great because it contains a lot of pixel art in different colors in a variety of configurations.<\/p>\n