Compose: Overlay over multiple coordinates w/o loop [Solved]

[coloring]

How can I overlay Small.png over Large.png at multiple coordinates without a loop?

I am currently looping this command (+0+0 is replaced with different coordinates every iteration):

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convert.exe Large.png Small.png -geometry +0+0 -compose over -composite Large.png

Could I "-geometry" accept a multi-line variable like the one below?

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+0+0
+11+22
+33+44
+44+0
+0+99

[fmw42]

How about this:

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convert.exe Large.png Small.png ^
( -clone 1 -set page +0+0 ) ^
( -clone 1 -set page +11+22 ) ^
( -clone 1 -set page +33+44 ) ^
( -clone 1 -set page +44+0 ) ^
( -clone 1 -set page +0+99 ) ^
-delete 1 ^
-flatten Large.png

or

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convert.exe Large.png ( Small.png -write mpr:img +delete ) ^
( mpr:img -set page +0+0 ) ^
( mpr:img -set page +11+22 ) ^
( mpr:img -set page +33+44 ) ^
( mpr:img -set page +44+0 ) ^
( mpr:img -set page +0+99 ) ^
-flatten Large.png

see https://imagemagick.org/Usage/layers/

There are various ways to do multiple image composites, but there is nothing like what you desire for -geometry

[coloring]

Thanks! What what if the number of coordinates is not fixed? Can I provide a text file with a list of coordinates? The Pins in a Map example is close, but I am running plain Windows.

If not, perhaps I could use a loop to generate the command text, and then execute the result. The idea is to avoid executing IM more than once.

[fmw42]

As far as I know, then only way is to write a script loop that will read your file and loop over doing a -composite or -flatten.

If the number of composites is not too many (that you exceed your OS limit of characters in a line), you can write a loop to create the single command. I do that often in my unix bash scripting.

[coloring]

In Windows, with the maximum length of the command string being limited to 8191 characters and "( -clone 1 -set page +NNNN+NNNN ) " taking up 34 characters -- assuming no shorter forms exist --, the number of coordinates that can fit in a single line is at least 238.

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(8191-90)/34=238

[fmw42]

So is 238 acceptable?

[coloring]

80% of the time, yes. I will add a loop to execute IM for every group of 238 coordinates to overcome this limitation. Does that mean there are no shortcuts for -clone and -set page? How come spaces inside the brackets are necessary?

[snibgo]

If your command is too long for the shell, write it to a file without the executable name or shell escapes, and run it as a magick script:

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magick -script myscript.txt

[fmw42]

How come spaces inside the brackets are necessary?

That is just the way Imagemagick must be parsed.

[coloring]

If your command is too long for the shell, write it to a file without the executable name or shell escapes, and run it as a magick script:

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magick -script myscript.txt

A godsend! Aren't compare.exe, composite.exe, conjure.exe, convert.exe, identify.exe, magick.exe, mogrify.exe, montage.exe, and stream.exe the exact same file, though?

[snibgo]

I don't know what you mean. As far as I know, "-script" works with v7 magick, and no other IM program.

[fmw42]

Aren't compare.exe, composite.exe, conjure.exe, convert.exe, identify.exe, magick.exe, mogrify.exe, montage.exe, and stream.exe the exact same file, though?

No each is different. In IM 7, they must be called by prefacing the names with magick, except for convert, which is simply replaced by magick.

[coloring]

Okay. It just seemed odd that they are all the same size (18,945 KB).

[coloring]

Something is wrong. Here is my version:

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C:> magick.exe --version
Version: ImageMagick 7.0.8-16 Q16 x64 2018-12-10 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2018 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Visual C++: 180040629
Features: Cipher DPC HDRI
Delegates (built-in): bzlib cairo flif freetype gslib heic jng jp2 jpeg lcms lqr
 lzma openexr pangocairo png ps raw rsvg tiff webp xml zlib

Content of myscript.txt:

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img\Large.png img\Small.png ( -clone 1 -set page +0+0 ) -delete 1 -flatten img\Output.png

I am calling myscript.txt in the command line (cmd.exe):

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C:>magick.exe -script myscript.txt

Result:

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magick.exe: UnableToOpenBlob 'imgLarge.png': No such file or directory @ error/blob.c/OpenBlob/3490.

Apparently, it does not like the backslash character (\) for some reason.

I replaced the backslashes with normal slashes in myscript.txt:

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img/Large.png img/Small.png ( -clone 1 -set page +0+0 ) -delete 1 -flatten img/Output.png

After calling magick.exe as before, this is the result:

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magick.exe: UnableToOpenBlob 'img/Output.png': No such file or directory @ error
/blob.c/OpenBlob/3490.

Does the output file have to exist for some reason? I tried creating such a file, but IM just fails silently in that case. The lines below behave as expected when executed directly in the command line:

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convert.exe img\Large.png img\Small.png ( -clone 1 -set page +0+0 ) -delete 1 -flatten img\Output.png
convert.exe img/Large.png img/Small.png ( -clone 1 -set page +0+0 ) -delete 1 -flatten img/Output.png

EDIT: According to https://stackoverflow.com/questions/50876200/, I needed to add -write to fix the Output issue:

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img/Large.png img/Small.png ( -clone 1 -set page +0+0 ) -delete 1 -flatten -write img/Output.png

The backslashes are still a problem, though.

[snibgo]

In Windows, use forward-slashes, or simply cd to the directory first.

For the output, use "-write", eg "-write img/Output.png".