2010.04.29 19:38 "Re: [Tiff] 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