program that stitches together a bunch of image files into one giant poster?

[grymmjack]

imagemagick convert.
https://imagemagick.org/script/convert.php

example:

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# horizontal:
convert *.jpg +append output.jpg
# vertical:
convert *.jpg -append output.jpg

replace the *.jpg and output.jpg with your desired formats/filenames.

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convert %1.png -alpha set -channel RGBA -fuzz 1%% -fill none -floodfill +0+0 black -interpolate nearest -interpolative-resize 400%% %1-rs.png

In the above example, it sets alpha, sets snap for colors (fuzz), sets no fill, fills with transparency, interpolates as nearest (pixelized) and resize to 400%. if you wanted to do this for a batch you'd use:

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convert *.png -alpha set -channel RGBA -fuzz 1%% -fill none -floodfill +0+0 black -interpolate nearest -interpolative-resize 400%% -append spritesheet.png

(or +append) if you want horizontal