As for better quality GIFs, no, I cannot do that. GIF has lower quality, and lower compression ratio than most modern formats. Actually I discarded some because those gif got over 20MB, which is the limit of this image board. I think WEBP format is better in this regard, but is not supported here.
Also, if you want individual high quality frames in jpeg, I can add them in, at least for the first frame of each egoia. So what do you want?
Ok, I solved the dithering probem. Reuploaded.
Update 2019.03.16: - Add cover image for ugoira - Imporve gif quality - Add resized versions of oversized gifs - Torrent now have webp for oversized gifs.