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April 2008

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2008.04.22 11:18 "Re: Interleaving images from multiple Tiff files", by Andrew Wan

Hi Richard
 
I was thinking to use the C system call to call tiffsplit & tiffcp. But
ofcourse I need to use TIFFReadDirectory to find out how many tiff images
are in tiff1.tif & tiff2.tif, and they should match in size (eg. 10 images
in tiff1.tif and 10 images in tiff2.tif).
 
Then somehow create an empty tiff file called output.tif and then run this
2-liner in a loop:
 
for (int i=0; i<size; i++) {
  system("copy output.tif temp.tif");
  system("tiffcp temp.tif tif1.tif,i tif2.tif,i output.tif");//ofcourse use
  sprint or something to set i
}
 
(according to http://www.libtiff.org/man/tiffcp.1.html)
Do you think this will work?
 
What is the fastest way to build tiffcp & tiffsplit? Is it necessary to have
built 
..\port\libport.lib ..\libtiff\libtiff.lib?
 
Cheers
 
 
> Date: Fri, 28 Dec 2007 10:30:39 -0700> From: Richard Nolde
> <nrichard8@qwest.net>> Subject: [Tiff] Interleaving images from multiple
> Tiff files> To: tiff@lists.maptools.org> Message-ID:
> <477532BF.5020203@qwest.net>> Content-Type: text/plain;
> charset=ISO-8859-1; format=flowed> > Andrew,> Two solutions come to mind.
> A very inefficient way to do this would be > to use tiffsplit to break
> each input file into separate output files and > then tiffcp to put them
> back together in a different order.> > If you want to do this on a regular
> basis, look at tiffcp and modify the > logic that reads files sequentially
> to read them in parallel. This will > require you to rewrite the main
> function to use multiple file handles, > one for each input file given as
> a parameter, and one for the single > output file. Loop through your reads
> one input file at at time, writing > each image to a single output file in
> sequence. You will have to > maintain separate indices for the read image
> and the write image, but > that should not be too hard. Of course, this
> assume that you are using > all the input images. You could select
> individual images from the input > image with the current logic in tiffcp
> if you always want the same > sequence from each input file. If you want
> to select independently from > each input file, build a list structure for
> each one and modify the > parser to associate each list with a specific
> input file.
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