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% Copyright (C) 2001-2023 Artifex Software, Inc.
% All Rights Reserved.
%
% This software is provided AS-IS with no warranty, either express or
% implied.
%
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
% CA 94129, USA, for further information.
%
% viewrgb.ps
% Display a raw RGB file created by -sDEVICE=bitrgb.
% If SCALE is defined, maps input pixels to output pixels with that scale;
% if SCALE is undefined, scales the image to fit the page.
% If BITS is defined, it is the number of bits per sample (1,2,8,12).
% NB: BITS=4 (corresponding to -dGrayValues=16) is not supported.
% if BITS is undefined, its default value is 1.
/viewrgb { % <filename> <width> viewrgb -
20 dict begin
/w exch def
/fname exch def
/bpc /BITS where { pop BITS } { 1 } ifelse def
/f fname (r) file def
mark fname status pop pop pop /flen exch def cleartomark
/h flen
w [ 0 4 8 0 0 0 0 0 24 ] bpc get
dup 0 eq {
(*** -dBITS=) print bpc =print ( is not supported. ***) = flush
quit
} if
mul 7 add 8 idiv idiv def
QUIET not { (Dimensions: ) print [w h] == flush } if
% Set up scaling.
/SCALE where {
pop
% Map pixels SCALE-for-1. Assume orthogonal transformation.
SCALE 1 0 dtransform add abs div
SCALE 0 1 dtransform add abs div
} {
% Scale the image (uniformly) to fit the page.
clippath pathbbox pop pop translate
pathbbox 3 -1 roll sub h div
3 1 roll exch sub w div .min dup
} ifelse scale
bpc 1 eq {
[ /Indexed /DeviceRGB 15 <
000000
0000FF
00FF00
00FFFF
FF0000
FF00FF
FFFF00
FFFFFF
000000
0000FF
00FF00
00FFFF
FF0000
FF00FF
FFFF00
FFFFFF
>
] setcolorspace
/BPC 4 def % change to 4 bit indexed
} {
bpc 2 eq {
[ /Indexed /DeviceRGB 255 <
000000 000055 0000AA 0000FF
005500 005555 0055AA 0055FF
00AA00 00AA55 00AAAA 00AAFF
00FF00 00FF55 00FFAA 00FFFF
550000 550055 5500AA 5500FF
555500 555555 5555AA 5555FF
55AA00 55AA55 55AAAA 55AAFF
55FF00 55FF55 55FFAA 55FFFF
AA0000 AA0055 AA00AA AA00FF
AA5500 AA5555 AA55AA AA55FF
AAAA00 AAAA55 AAAAAA AAAAFF
AAFF00 AAFF55 AAFFAA AAFFFF
FF0000 FF0055 FF00AA FF00FF
FF5500 FF5555 FF55AA FF55FF
FFAA00 FFAA55 FFAAAA FFAAFF
FFFF00 FFFF55 FFFFAA FFFFFF
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000
>
] setcolorspace
/BPC 8 def % change to 4 bit indexed
} {
/DeviceRGB setcolorspace
/BPC bpc def
}
ifelse
}
ifelse
<< /ImageType 1
/Width w
/Height h
/BitsPerComponent BPC
/ImageMatrix [1 0 0 -1 0 h]
/DataSource f
/MultipleDataSources false
bpc 4 lt { /Decode [ 0 [ 0 15 255 ] bpc get ] } { /Decode [ 0 1 0 1 0 1 ] } ifelse
>> image
showpage
f closefile
end
} bind def
% If the program was invoked from the command line, run it now.
[ .shellarguments {
counttomark 2 eq {
cvi viewrgb
} {
cleartomark
(\nUsage: gs -- viewrgb.ps filename.rgb width\n) print
( e.g.: gs -- viewrgb.ps my.rgb 2550\n) print flush
( -dSCALE=### sets specific scaling \(default = 1.0\)) = flush
( -dBITS=# sets the BitsPerComponent \(1, 2, 8, 12] \(default = 1\)) = flush
(From version 9.50 you must supply permissions for this program to read the input file(s)\n) print flush
(either by using -dNOSAFER or by supplying --permit-file-read=<filename>\n) = flush
} ifelse
} {
pop
} ifelse
|
