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- Newsgroups: comp.lang.postscript
- Path: sparky!uunet!math.fu-berlin.de!freia.sax.de!beck
- From: Andre_Beck@irs.inf.tu-dresden.de (Andre Beck)
- Subject: XDPS Color Use (once more...)
- Message-ID: <AM39QBM@math.fu-berlin.de>
- Keywords: XDPS setXrgbactual
- Sender: beck@freia.sax.de (Andre Beck)
- Organization: Dept. of Computer Science, TU Dresden, Germany.
- Date: Tue, 22 Dec 1992 19:57:26 GMT
- Lines: 139
-
- Hi PostScript(tm)-Gurus,
-
- after some discussions to the Color use
- of [X]DPS on colormapped displays (instead of truecolor ones) I came up
- with the thought of
-
- red green blue setXrgbactual pop
-
- would do a color cell allocation for me, with red, green, blue beeing
- some floats 0..1 and the popped bool indicates if it was successful.
-
- I tried this immediately with dpsexec (a neat client that simply sends
- my trash to the server) and was surprised to get a success indicator even
- if I used floats 0..1 for the rgb values, or f.i. ints like 200, 2000,
- 66000 ... i got true.
-
- Does this setXrgbactual thingy do some autoscaling ???
-
- Or is it only defined as { pop pop pop true } on my machine's XDPS
- system ? (DEC 5000 Ultrix 4.3)
-
- At the moment methinks the latter is true, because the following code
- to display colormapped images still dithers its output:
-
- ------------------------ snippel -------------------------------------
- %!
- %%Creator: ABPSoft fbm2xdps converter
- /numcols 64 def
- /rgbstr 3 string def
- /alloccolorcells {
- 0 1 numcols 1 sub {
- cmap exch get dup dup
- 2 get 256 div 3 1 roll 1 get 256 div 3 1 roll 0 get 256 div 3 1 roll
- setXrgbactual pop
- } for
- } bind def
- /colormap
- {[exch{currentfile rgbstr readhexstring pop 3 string copy}repeat]}bind def
- numcols colormap
- 27d800004ab54fb0007788009f6000c738000029d6ef100000946b0008f700ff0000738c
- 07f80000de210052ad2fd00057a8007f8000a7580000bd420031cecf3000f70800009c63
- 0010ef007b8400e6190ff000005aa537c8005fa00087780000c53aaf50000039c6d72800
- ff000000a45b0018e700837c00ee1117e80000629d3fc0006798008f700000cd32b74800
- 0041bedf200000ac530020df008b7400f6091fe000006a9547b8006f900097680000d52a
- bf4000e7180000b44b0000ff
- /cmap exch def
- /setXrgbactual where {pop alloccolorcells} if
- % image data
- /width 32 def
- /height 64 def
- /srcstr width string def
- /dststr width 3 mul string def
- width height scale
- width height 8 [width 0 0 height neg 0 height]
- { currentfile srcstr readhexstring pop pop
- 0 1 width 1 sub {
- dup srcstr exch get cmap exch get
- exch 3 mul
- dststr exch 3 2 roll putinterval
- } bind for
- dststr
- } bind
- false 3
- colorimage
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-
- ----------------------- snuppel --------------------------------
-
- --
- ,------------------------+---------------------------------------------.
- | Andre' Beck (ABPSoft) | TCP/IP-Mail: beck@freia.inf.tu-dresden.de |
- | HG R 142 | VMS : hermes::beck |
- +------------------------+---------------------------------------------+
- | Windows is the best placebo against MS-DOOF headaches ! |
- `----------------------------------------------------------------------'
-
-