Please compress them properly then upload. Or I have to double-delete them.

They're not originally PNGs then?

The cg is originally in bmp, I converted to png(no compression)

why no compression? Don't you know png is lossless? I can compress this to 2.48MB w/o any difference.

fireattack said:
why no compression? Don't you know png is lossless? I can compress this to 2.48MB.

I use xnconvert, select compression level 0 (will upload again)

plz use 6 or higher.

As long as a format is lossless, the level of compression is simply a question of how much CPU, memory, and time you want to spend compressing or decompressing the file. That could have a major impact with video, making it unplayable on some machines if the encoding options used to compress it were too expensive for that machine to decode quickly enough to play the video at the appropriate framerate, but for a single image like you have with a png file, there's really no reason not to compress it as much as you can.