beertje wrote: > This has me a bit stumped... > > I'm trying to extract pictures from a file. So far I'm successfully > retrieved the header and what I think is the colour for each pixel. > Here's the description: > > """ > 3) The picture data format: > The color information is 15 bit data stored in 16 bit. This means the > most > significant bit is unused. The data is stored line for line in little > endian Intel format starting with top left edge to bottom right edge. > This > is normally called chunky format. > > Bit 0.. 4 blue value > Bit 5.. 9 green value > Bit 10..14 red value > """ > > So I've got a list of 16-bit numbers, but how to extract RGB info from > those I'm a bit lost. I thought at first I should convert the decimal > (say 23294) into a binary (say 0101101011111110) into something like > this: > blue: 01011 > green: 01011 > red: 11111 > > But encountered two problems: First, I don't know what the best way is > to do this conversion, but more importantly I don't see how every > colour could possibly be represented like this. 65535 is presumably > white, but converting this into chunks of 5 gives me a 31, 31, 31, a > dark shade of grey. > > I guess I'm on the wrong track completely? > > I'm a bit unsure about how to treat what the guide calls 'UWORD'...
ANDing and SHIFTing are your friends here: v = 0x0bcd b = v & 0xf v >>= 4 g = v & 0xf v >>= 4 r = v & 0xf print r, g, b Diez -- http://mail.python.org/mailman/listinfo/python-list
