On Feb 18, 2011, at 9:55 AM, Graham Cox wrote: > > On 18/02/2011, at 11:40 AM, John Joyce wrote: > >> Instead of -whiteColor is it not possible to simply create a color using 255 >> a.k.a. FF for R, G and B respectively? >> This is white in RGB. > > Also, this is incorrect. > > This assumes two things - that colour components have 8 bits and that all > bits set represent full brightness of the component. Both of these things > depend on the colour space. Typically, colour components are expressed as a > float value between 0 and 1.0 relative to the colourspace, and are mapped to > the actual number of bits per component (modulo colour calibration) in a > bitmap internally. > > The colour model of Windows 3 (and Colour QuickDraw for that matter) are long > behind us. > > --Graham Ah, yes, sorry. Been a while! Easy to forget about when spending too much time on web graphics... Thanks!_______________________________________________
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