Marcelo Ramos wrote: > > On Tue, Nov 07, 2000 at 12:52:37PM +0100, Jonathan Gift wrote: > > Hi, > > > > While I realise you can have many different color depths, I remember reading > > (but am not sure) that 32bpp is the Linux default... assuing the card > > supports it. > > > > I just want to check if that's so and what difference that makes with 24 > > bit, sice the number of colors is the same? > > > > The number of colors is not the same. > > With 24bpp you have the color of each pixel represented by a binary number > with > 24 bits (bit = 0 or 1), then you have 2^24 = 16.777.216 colors. > > With 32bpp you have the color of each pixel represented by a binary number > with > 32 bits, then you have 2^32 = 4.294.967.296 colors. > > If you want a given resolution HxV with Nbpp you video card must have at least > (H * V * N) / (1024^2) Kbytes of memory. > > Marcelo. > Hello,
I don't think that using 32bpp increases the number of colours that can be used - 32bpp is generally used as 24bpp (8bpp each for RGB) + 8bpp alpha channel. 16bpp is split R=5bpp, G=6bpp & B=5bpp. I've seen 36bpp scanners and they do work with more colours - 12bpp each for RGB. LeeE
