assembling one big image from smaller ones

Dec 07

assembling one big image from smaller ones

Say there’s a sequence composed of 16 smaller images (256×256, a01~a16.tga) and I would like them to be assembled into one single big image (1024×1024) in forms of 4 rows by 4 columns,
how can I do this using nuke nodes, or via scripting(python/tcl gizmo or writing custom nodes etc)?

I rendered some fire effects image seqs and would like to combine them all to one.

something like this:
(from)
o, o, o, o, o, o, o, o, o, o, o, o, o, o, o, o (16 individual 256×256 images)

(to)
o o o o
o o o o
o o o o
o o o o (1 1024×1024 image)

Thanks in advance.

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Hasta La Motion!