I'm trying to write a oneliner that gets unique ids of tif files in a directory, and then runs ImageMajick's convert to combine them together into multipage tifs:
convert ..\image_data\ua-nws_00000991_001.tif ..\image_data\ua-nws_00000991_002.tif ..\image_data\ua-nws_00000991_003.tif ..\image_data\ua-nws_00000991_004.tif ua-nws_00000991_all.tif
This works, but I'm trying to automate it for a bunch of ids that have several tifs each. For now, I'm just using one id and using "echo" instead of convert:
echo "ua-nws_00000991" | % { $id=$_; ls ../image_data | ? { $_.FullName -match $id } | % {
echo $_.FullName } | Join-String -Separator '" "' | % { echo '"'$_'"' $id"_all.tif" }
}
But I'm having trouble turning the list of files into a list of arguments. I'm getting the following (I've manually made the paths relative for online posting):
"
.\image_data\ua-nws_00000991_001.tif" ".\image_data\ua-nws_00000991_002.tif" ".\image_data\ua-nws_00000991_003.tif" "C:\Daniels_Stuff\Classes\Current\grad_ai\project\repo\article-reconstruction\image_data\ua-nws_00000991_004.tif"
ua-nws_00000991_all.tif
Before I added the double quotes, convert was interpreting all of the final $_ as one argument. I'm adding quotes in order to force convert to see them as multiple arguments. But I can't seem to get rid of that newline. I think it might be caused by the final echo, but if I replace it with convert, I get the following:
convert.exe: unable to open module file `C:\Program Files\ImageMagick-6.9.2-Q16\modules\coders\IM_MOD_RL_\ABSOLUTE\PATH\TO\MY\IMAGES\IMAGE_DATA\UA-NWS_00000991_001.TIF C_.dll': No such file or directory @ warning/module.c/GetMagickModulePath/674.
convert.exe: no decode delegate for this image format `\ABSOLUTE\PATH\TO\MY\IMAGES\IMAGE_DATA\UA-NWS_00000991_001.TIF C' @ error/constitute.c/ReadImage/501.
convert.exe: no images defined `ua-nws_00000991_all.tif' @ error/convert.c/ConvertImageCommand/3241.
Whilst I don't understand Powershell's mad syntax, there are two aspects to ImageMagick that may help you out...
Aspect 1 - Filenames on stdin
Firstly, you can pass a list of filenames to merge into a single TIF on ImageMagick's stdin rather than as parameters. So, if you have 3 pages of a book, in 3 files called p1.tif, p2.tif and p3.tif, rather than do:
convert p*.tif book.tif
you can also do
dir /b/s p*tif | convert @- book.tif
Whilst I am generating the names above using DIR /B/S, I expect you would want to replace that with your Powershell commands.
Aspect 2 - Multiple images down single pipe
Secondly, you can pipe multiple images from multiple invocations of convert into a further final invocation of convert using "Magick Image File Format" (MIFF) streaming:
Here is one example, where two invocations of convert both send an image each to a final convert that joins the images from its MIFF input stream:
( convert p1.tif MIFF:- & convert p2.tif MIFF:- ) | convert MIFF:- book.tif
Here is a slightly different example of the same thing:
FOR files *.TIF; DO
IF this file has the correct id
convert $this MIFF:-
ENDIF
ENDDO | convert MIFF:- book.tif
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