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Date: Fri, 26 Aug 2016 22:30:55 -0700 (PDT)
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Subject: Re: zLibAda vs ZipAda (which should I use, if any)?
From: gautier_niouzes@hotmail.com
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Date: 2016-08-26T22:30:55-07:00
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> Converting them back into usable images appears to be a completely different problem (well its new to me).  In essence, I'll now try to reconstruct the image using UnZip.Streams.Open (from Zip-Ada). Not sure where that will lead me...

Sure, it is a different question.
Since you are considering decoding the images (for thumbnail or icon generation perhaps ?), I guess this will be helpful to you:
https://sf.net/projects/gen-img-dec/
Supports the BMP, GIF, JPEG, PNG, PNM, TGA formats.
The demo in test/mini.adb can be adapted: replace the Stream_IO file by the the opened Zip stream...