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Open-source Photoshop alternative passes early tests, but blends match due to PSD answer key

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A developer tested PhotoCraft, a new open-source reimplementation of Photoshop written in Rust. They created custom photoshop files to check how accurately it renders blend modes like Soft Light. The tool passed tests by closely matching Photoshop's outputs, often within a 2/255 pixel difference. This accuracy was found to rely partly on the merged image data that Photoshop itself saves within .PSD files. The project's code implements specific, observed Photoshop behaviors that differ from public specifications.

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