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Developer Uses PNG Alpha Masks to Fix Transparency Issues in AI-Animated WebP Tiles

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A developer building a new UI for Isovalent Labs encountered a transparency problem while creating animated isometric tiles for a learning platform. The tiles begin as static PNGs and animate via short looping videos generated with AI, but standard formats struggled to preserve clean edges. The solution involved extracting the alpha channel from the original PNG and applying it as a mask to each video frame using FFmpeg and ImageMagick before encoding to animated WebP. WebP was chosen over GIF because GIF only supports binary transparency, producing jagged edges, while WebP and APNG support full alpha with smooth anti-aliasing. The developer published a reusable shell script to automate the entire pipeline, from frame extraction to final WebP output.

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