AWARE [SYSTEMS] Imaging expertise for the Delphi developer
AWare Systems, Imaging expertise for the Delphi developer, Home TIFF and LibTiff Mailing List Archive

LibTiff Mailing List

TIFF and LibTiff Mailing List Archive
April 2010

Previous Thread
Next Thread

Previous by Thread
Next by Thread

Previous by Date
Next by Date

Contact

The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems



Valid HTML 4.01!



Thread

2010.04.29 19:38 "Re: Tiff Digest, Vol 71, Issue 10", by Richard Nolde
2010.04.30 12:55 "Re: Problem with tiff2ps page split", by Thomas Jarosch

2010.04.29 19:38 "Re: Tiff Digest, Vol 71, Issue 10", by Richard Nolde

On 04/29/2010 11:00 AM, tiff-request@lists.maptools.org wrote:
> tiffcrop -e combined -U in -X 8.26 very_long_page.tiff cropped.tiff
Several suggestions:
The export flag,  -e, is used to define how multiple selections for a 
single image are presented in the output image file. Using -e combined 
would take multiple selections from a given image and combine them into 
a single image in the output file. What you want is -e divided so create 
separate images for each selection but write them all to one output file.

The -X flag is used to select a single section of an image of a given 
width. Without any other specifier, the entire length of the image will 
be used.  I suspect you want something link -Y 11.694, assuming Unit of 
inches as you have specified above.

What you really want is multiple selections of a given size, not just 
one as will be produced using -X and/or -Y.

Several options might work for you. Using the -Z zonelist option with -e 
divided, produces two pages within a single file, eg the upper half 1:2 
and the lower half 2:2.

tiffcrop -Z1:2,2:2 -e divided very_long_page.tiff fax2page-1.tiff

Using -z coordinate pairs gives you even more control of the exact start 
and end of each output page.
tiffcrop -z0,0,1728,2198:0,2199,1728,4396 -e divided very_long_page.tiff 
fax2page-2.tiff

Using the -Scols:row option breaks the image into individual subsets of 
X columns across by Y Rows down by dividing the width by X and the 
height by Y.
tiffcrop -S1:2 -e divided very_long_page.tiff fax2page-3.tiff

Running tiffinfo on the output should show two images at roughly half 
the height in each case.

I assume that what you really want is the functionality off the -P 
papersize option which breaks the image into N number of smaller images 
that do not exceed a given papersize.  Unfortunately, your fax doesn't 
match any standard paper size that I know about. The width, which must 
be calculated at the horizontal resolution is 8.52 inches and the height 
is 11.21 inches.

tiffcrop -P a4 -e divided produces multiple pages, two of which are very 
narrow, one very short, one very short and narrow in addition to the 
desired main pages.

It might not take but a few lines of code to add an option for a custom 
page size to specified on the command line, eg
tiffcrop -U in -P8.52x11.21  which would break the long image into a 
series of images not wider or longer than those dimenions regardless of 
how many pages that is.  Let me know if that would be useful.

Your image is a fax in Group3 format and the horizontal and vertical 
resolutions do not match.  This may or may not have an impact on the 
tiff2ps command.

tiffinfo very_long_page.tiff
TIFF Directory at offset 0x2affa (176122)
   Subfile Type: multi-page document (2 = 0x2)
   Image Width: 1728 Image Length: 4396
   Resolution: 203, 196 pixels/inch
   Bits/Sample: 1
   Compression Scheme: CCITT Group 3