Rick Macdonald <[EMAIL PROTECTED]> writes: > I can't tell the difference between 16bpp and 24bpp 24 colour JPEG > files, viewed with xv.
OK, i'm no profi on this matter, but i'll try to explain: First, your eyes can't differentiate between more than some thounds colors (IIRC about 2.000 - 4.000 colors). Next you would probably ask, why then use as much colors as about 65.000 or 16 million. Here we go: Every man and woman recognizes different colors (say Eskimos (what's that in english? i mean the people in the snow in the north, Greenland and so) can recognize about 200 variants of white and the indians in the rainforest can recognize about 200 variants of green), so we need more than some thounds colors. Next there are some technical problems. 16 bit mode uses a palette (i don't know the english term) where red, green and blue uses 5 or 6 bits (i.e. 565 for rgb or 655 or the like). Every program may define its own set of used colors and so you may end up with fewer colors usable than about 65.000. Next are things like antialiasing - there are colors between colors very useful which can't be recognized as different colors so you can get a smoth plane with goes from i.e. red to green without any lines recognziable. I hope you can understand my english. It's not used very often. :) -- Until the next mail..., Stefan.
