jh34607@suntc.UUCP (john howell) (12/08/89)
I am writing a PostScript file/program that has a color raster image as part of it. When I refered to the RED BOOK I noticed the following footnote: At present, the POSTSCRIPT language does not provide a way to represent full color in a single image. However, under suitable conditions, full color can be represented as three color separations each defined by a gray-scale image. Such image processing is beyond the scope of this manual. OK, in my case I have two situations: 1) Raster image data is encoutered as a single scan line consisting of RGB full color pixels. 2) Raster image data is encountered as a rectangular block very much like the regular gray scale images, except the block consists of RGB pixels. I was hoping to use the "image" descriptor, but it appears unavailable. Another way would be to draw each pixel as a small filled rectangle and I could probably do some run length encoding, but this seems excessive. Can someone recommend a way to handle these images ... perhaps a reference to the color separation technique described in the RED BOOK? Thanks. ======================================================================== John Howell uucp: uunet!suntc!jrh Deere & Company MCImail: 360-4047 Technical Center CompuServe: [76666,2505] 3300 River Drive FAX: (309)765-3807 Moline, IL 61265 Voice: (309)765-3784 ========================================================================
ib@apolling (Ivan N. Bach) (12/09/89)
Color extensions to the PostScript language are described in the Section
"Color Operator Definitions" in the User's Guide for a QMS ColorScript 100
printer, the first color PostScript printer. These extensions include a
new operator called "colorimage."
Ivan N. Bach Tel (408) 986-9400, x508
QMS, Corp. Fax (408) 727-3725
2650 San Tomas Expressway arpa: imagen!ib@decwrl.dec.com
Santa Clara, CA 95051 uucp: {decwrl,sun}!imagen!ib