2009.01.16 15:54 "[Tiff] Tiff2ps centering and imagemask operator option", by Richard Nolde

2. tiff2ps option -c (Joerg Schlueter)
Joerg,
   I believe that you are correct in saying that the centering code is
not working. I have been working on a patch that provides rotations of
90, 180, and 270 degrees plus an "auto" mode in which the image will be
rotated to best fit the size specified with -h and -w and I can confirm
your problem. I am testing my patch with the center option as well and
will upload the final version to bugzilla when I have finished testing.

In testing my new code, (based on libtiff-3.9 CVS tree), I discovered that the -m option to use the "imagemask" operator produces invalid Postscript on some Tiff files generated by Adobe Photoshop 7.0 (The only version to which I have access.) Without the "imagemask" Postscript operator, eg using the default of "image" instead, the files seem to be correctly read by both Photoshop and Ghostscript. With the -m flag, Photoshop errors out with "the parser module cannot parse the file" and Ghostscript 8.63 on Fedora 8 blows up with:

gs -q -sDEVICE=bbox -dNOPAUSE -dNOPROMPT -dBATCH Widetest-map-centered.ps
Error: /typecheck in --imagemask--
Operand stack:

   3200   1000   1   --nostringval--   --nostringval--

Execution stack:

   %interp_exit   .runexec2   --nostringval--   --nostringval--   

--nostringval--   2   %stopped_push   --nostringval--   

--nostringval--   --nostringval--   false   1   %stopped_push   1905   

1   3   %oparray_pop   1904   1   3   %oparray_pop   1888   1   3   

%oparray_pop   1771   1   3   %oparray_pop   --nostringval--   

%errorexec_pop   .runexec2   --nostringval--   --nostringval--   

--nostringval--   2   %stopped_push   --nostringval--   1810   5   4   

%oparray_pop   --nostringval--   --nostringval--

Dictionary stack:

   --dict:1147/1684(ro)(G)--   --dict:0/20(G)--   --dict:70/200(L)--   

--dict:1/100(L)--
Current allocation mode is local
Last OS error: 2
Current file position is 517
GPL Ghostscript 8.63: Unrecoverable error, exit code 1

Richard Nolde

> Message: 2
> Date: Tue, 13 Jan 2009 17:38:44 +0100
> From: "Joerg Schlueter" <joerg29@gmail.com>
> Subject: [Tiff] tiff2ps option -c
> To: tiff@lists.maptools.org
> Message-ID:
> <947639ed0901130838l73806151rac0253ecabb0d786@mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1

I'm using tiff2ps as described at http://www.firstpr.com.au/sys-admin/TIFF-to-PDF and wanted to center small images:

tiff2ps -c -w5.51 -h7.76 *.tif | ps2pdf13 -sPAPERSIZE=a4 - > documents.pdf

seems that the -c option has no effect, the images are located at the bottom of the page, aligned left. I have Mepis7 with preinstalled libtiff (don't know which version this would be), but also tested using v4.00 beta2, same result

is there another way to center the images both horizontal and vertical?

thanks in advance, kind regards
Joerg