hi!
here's my problem:
i have a 24bpp pic.
i want to dither that picture so that it looks good on a R5B5G5 display.
so i want the resulting image to be a bitmap (24bpp, wont be palettized) that only uses colors that have only 5bits per color, ie the 3 lowest bits to zero (cause the mobilephone display will cut them anyway).
BUT, i want the picture to be dithered anyway, using these (5bits=32shades per channel), or 2^15 colors, to make it look as there is more bits/channel , so more colors.
its simple in fact, how come i dont find some freeware to do it? if you know some commercial app that will do it (maybe PSP or Pshop) it's fine too.
many thanks!
here's my problem:
i have a 24bpp pic.
i want to dither that picture so that it looks good on a R5B5G5 display.
so i want the resulting image to be a bitmap (24bpp, wont be palettized) that only uses colors that have only 5bits per color, ie the 3 lowest bits to zero (cause the mobilephone display will cut them anyway).
BUT, i want the picture to be dithered anyway, using these (5bits=32shades per channel), or 2^15 colors, to make it look as there is more bits/channel , so more colors.
its simple in fact, how come i dont find some freeware to do it? if you know some commercial app that will do it (maybe PSP or Pshop) it's fine too.
many thanks!
photoshop can do it. just open picture and save-as in format you desire.
but IMHO you should just google for some free / trial "Image Converter", i saw lots of them around
but IMHO you should just google for some free / trial "Image Converter", i saw lots of them around
its not as simple as saveing in another format.
its not 256 nor 32bpp...
BUT i have found how to do it!
photoshop annd the gimp can do it, this paper explains it:
http://tcpro.lasyk.net/files/dg_adapt_images_r2a.pdf
however you'll have to manually separate the channels, edit a grayscale uniform palette, dither the channels with this palette and recompose them, then save.
bye!
its not 256 nor 32bpp...
BUT i have found how to do it!
photoshop annd the gimp can do it, this paper explains it:
http://tcpro.lasyk.net/files/dg_adapt_images_r2a.pdf
however you'll have to manually separate the channels, edit a grayscale uniform palette, dither the channels with this palette and recompose them, then save.
bye!