robdu@syma.sussex.ac.uk (Robert James Duncan) (11/30/90)
I am writing a driver for a greyscale video device and I need to know how to inform Quickdraw that there is only one output channel instead of the normal three (red, green and blue). If I had a fixed linear ramp of greys, then I suppose I could specify that I was a direct device with each 8-bit pixel consisting of one 8-bit component. Does any one know whether this will work, or how to specify greyscale for a writeable clut, i.e. an indexed device? Rob. -- --------------------------------------------------------------- rob duncan, school of cognitive and computing sciences, university of sussex, brighton, uk. robdu@cogs.susx.ac.uk ---------------------------------------------------------------
russotto@eng.umd.edu (Matthew T. Russotto) (12/02/90)
In article <3936@syma.sussex.ac.uk> robdu@syma.sussex.ac.uk (Robert James Duncan) writes: >I am writing a driver for a greyscale video device and I need to know >how to inform Quickdraw that there is only one output channel instead of >the normal three (red, green and blue). > >If I had a fixed linear ramp of greys, then I suppose I could specify >that I was a direct device with each 8-bit pixel consisting of one 8-bit >component. Does any one know whether this will work, or how to specify >greyscale for a writeable clut, i.e. an indexed device? Can you just set the gdDevType bit of the GDflags of your GDevice to 0? -- Matthew T. Russotto russotto@eng.umd.edu russotto@wam.umd.edu .sig under construction, like the rest of this campus.