On Thu, Apr 18, 2024 at 09:21:17PM +0800, Qian Yun wrote: > > > On 4/16/24 22:38, Waldek Hebisch wrote: > > > > Just a silly question: have you looked why the image is so big? > > Your new image is 6.7M and bigger than scanned version (4.3M). > > Old knot3.ps is 77k lines giving 1.1M size. At first glance > > adding color to this could double or maybe triple the size. > > .pdf uses compression, compressed knot3.ps is 153k. So > > I would expect .pdf of order 0.5M. > > > > Update on image size: > > The 3D "smooth" style is pixel-for-pixel bitmap. > So for colored knot3 image (400x400): > ps is 2.1MB > xpm is 320KB > pdf is 208KB (converted from ps) > png is 28KB (converted from xpm) > > > The only difference/advantage of PS format is that it has > vector font (for x/y/z, title, etc). > > So if the image have no axes and no title, just colored pixels, > we can use png format.
OK, so it looks that for Postscript "shade" is really preferable. Still, bitmapped color "smooth" is better than b/w or not working at all. Concerning FriCAS book, I do not think that we must follow old version. Rather, we want to have good looking examples and have samples of various formats/options, but we can use different pictures. There is one extra thing: it would be good to be able to generate all documentation without X11. Currently bitmap generation works by first drawing on X window and then grabbing from X server the resulting bitmap. This fails without X server. Vector formats should alow direct generation (currently even vector Postscript depends on X for color calculations, but that should be not too hard to eliminate). -- Waldek Hebisch -- You received this message because you are subscribed to the Google Groups "FriCAS - computer algebra system" group. To unsubscribe from this group and stop receiving emails from it, send an email to fricas-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/fricas-devel/ZiEpEnhkpf6ymlCc%40fricas.org.