I was attempting to do some automated text processing
of A4 scans.

My test data was 5100x6494 pixel, grayscale 300 dpi
something like a A3 300 dpi scan.

Not trivial, but my main server is quite big.

Jeez, even my laptop has 750 Mb of RAM

Now, a single scan as raw bytes should be around
5100x6494 = 31.5 Mb

Not a problem.

I was attempting to use a (Gimp created) mask to split
text from images, so I could apply different processing
to text and graphics.

So; here's my line to do that.

convert  'data.png' \( -size 5100x6494 xc:'white' \) +swap \( 'mask.png'  \) 
-composite v.tif

Memory consumption as shown by "top" after 4 minutes...
967 Mb

WHAT!?

I don't expect ImageMagick to be re-written for my sake,
but if anyone could outline what's going on I'd be grateful.

Or am I provoking worst case behaviour in my ignorance?

  BugBear

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