curfmanm@prism.CS.ORST.EDU (Matthew Curfman) (02/08/91)
David Whitney writes: | Ah, the 15-bit color claim is wrong. It's 16-bit. With the appropriate | VRAM expansion. Which is high priced. That gives you 65536 colors on | screen at once no tricks or stunts - not 4k. The Mac LC, when installed with the additional VRAM, does in fact have only 15-bit color, with the remaining bit used as a misc. alpha channel. This was confirmed by a call to an Apple Employee friend of mine here in Portland. The educational discount here at OSU for the VRAM is $149.00, which I personaly wouldn't consider that expensive. 15 bits will allow the LC to produce 32,768 colors at a time. Why they didn't use the 16th bit as a color bit, I don't know. What use is a one bit alpha channel for anything other than some kind of overlay hardware? _______________________________________________________________________________ Matt Curfman Technovelty. Inc. curfmanm@prism.cs.orst.edu Oregon State University OSU says what it says. I say what I say. We don't say the same thing.
torrie@cs.stanford.edu (The Ghost Who Walks) (02/08/91)
curfmanm@prism.CS.ORST.EDU (Matthew Curfman) writes: >David Whitney writes: >15 bits will allow the LC to produce 32,768 colors at a time. Why they didn't >use the 16th bit as a color bit, I don't know. What use is a one bit alpha >channel for anything other than some kind of overlay hardware? Apple's colour model is RGB, i.e. 3 components. 15/3 = 5 bits for each. 16/3 = 5.33333 bits for each. My guess is that 32-bit QuickDraw (which is what model the 15-bit colour is using), assumes that each component is the same size. -- ------------------------------------------------------------------------------ Evan Torrie. Stanford University, Class of 199? torrie@cs.stanford.edu "If it weren't for your gumboots, where would you be? You'd be in the hospital, or in-firm-ary..." F. Dagg