Printing JPEG-EPS images on PS level 2 printer

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2 total messages Started by Samuli Jokipaltio Tue, 27 Oct 1992 22:25

#14

Author: Samuli Jokipaltio
Date: Tue, 27 Oct 1992 22:25

58 lines
2047 bytes

I have few images compressed with Adobe Photoshop's "Adobe JPEG
Compress" Plug-in and they are in PostScript format. The header states
that I must have a level 2 printer to print these with, but when I try
to print them with my LaserWriter IIf, it only gives an PostScript error
(%% Image - TypeCheck ...%%)

What to do? Where is the problem?

Here's the header if someone is interested (from a grayscale pic):

%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Adobe JPEG Compressor
%%Title: Test Image.JPEG
%%CreationDate: 14.10.1992 00:19
%%BoundingBox: 0 0 400 400
%%SuppressDotGainCompensation
%%DocumentData: Clean7Bit
%%EndComments
%%BeginProlog
%%EndProlog
%%BeginSetup
%%EndSetup
/l2 systemdict /languagelevel known
{languagelevel 2 ge} {false} ifelse def
/r 400 def /c 400 def
/DI {
/x 128 string def currentfile x readline pop pop
72 65536 mul 4718592 div dup c mul exch r mul scale
/DeviceRGB setcolorspace
/Data currentfile /ASCII85Decode filter /DCTDecode filter def
7 dict begin /ImageType 1 def
/Width c def /Height r def
/ImageMatrix [c 0 0 r neg 0 r] def
/BitsPerComponent 8 def
/Decode [0 1 0 1 0 1] def
/DataSource Data def currentdict end image } def
/DB {.9 setgray 0 0 moveto 0 r lineto
 c r lineto c 0 lineto fill 0 setgray
/ratio {c 360 div mul} def
/Helvetica findfont 15 ratio scalefont setfont
20 ratio 5 ratio moveto
(JPEG Encoded image needs PostScript Level 2) show
/x 128 string def
{currentfile x readline {} {pop exit} ifelse
(~>) search {pop pop pop exit} {pop} ifelse
} loop } def
l2 {DI} {DB} ifelse
%%BeginData:          157 ASCII Lines
.
.
.

%%EndData

Thanks!

Samuli Jokipaltio
Univ. of Helsinki

Re: Printing JPEG-EPS images on PS level 2 printer

#116

Author: Kevin Draz
Date: Tue, 03 Nov 1992 05:19

26 lines
1668 bytes

In article <1992Oct27.222522.19519@klaava.Helsinki.FI> jokipalt@klaava.Helsinki.FI (Samuli Jokipaltio) writes:
>I have few images compressed with Adobe Photoshop's "Adobe JPEG
>Compress" Plug-in and they are in PostScript format. The header states
>that I must have a level 2 printer to print these with, but when I try
>to print them with my LaserWriter IIf, it only gives an PostScript error

There's a bug in this compression filter for CMYK images.  You need to
change the "/Decode ..." array from "[0 1 0 1 0 1]" to "[1 0 1 0 1 0 1 0]"
and change the colorspace to "/DeviceCMYK" (from device RGB).

The filter sets up a proper header for the RGB data, but does not alter this
header to reflect the 4-channel case.

This may be your problem, although our level-2 devices give ioerror when
this happens, not typecheck.

Also, I haven't looked at grayscale images (if the filter even supports
them!).  If this is what you are doing, and you are still getting the RGB
header, you'll need to change to "/Decode [0 1]" and /DeviceGRAY colorspace.

KD

-- 
----
kevind@pogo.wv.tek.com  | For most software publishers, quality is job 1.01.
Tektronix Color Printers|                            -- MacWeek Magazine

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