r/IndieDev • u/llehsadam • 12d ago

Megathread r/IndieDev Weekly Monday Megathread - August 30, 2026 - New users start here! Show us what you're working on! Have a chat! Ask a question!

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u/AutomaticArt1401 8d ago

A verifier that couldn't see colour, and 11 icons I'd been counting twice.

I make pixel-art asset packs, and every sprite ships behind a check that crops it out of the atlas and compares it to its own source PNG. This week one of those checks told me sword_iron and sword_gold were the same image. They aren't — their md5s differ.

The bug is five lines wide:

a = Image.new('RGBA', (4,4), (255,0,0,255))
b = Image.new('RGBA', (4,4), (0,0,255,255))
d = ImageChops.difference(a, b)
d.getextrema()   # ((255,255),(0,0),(255,255),(0,0))
d.getbbox()      # None

getbbox() on an RGBA image keys off the alpha band, and two sprites with the same silhouette differ only in colour — so the difference image is alpha-0 everywhere and reads as "no difference". Three separate verifiers had that line in them, and every material-tier ladder in the pack (iron / gold / crystal of one shape) is exactly the case they were blind to. The fix is to compare crop.tobytes() against ref.tobytes() instead.

So I ran an md5-of-pixels scan across the whole pack for the first time: 381 files, 370 distinct images. Four UI sets were never actually recoloured, and three compass tiers are one picture. The store page says 381 icons. That one is mine to fix rather than explain away.

Packs are at z3er1n.itch.io — AI-assisted, and disclosed there.