Intuitively, it’s not too difficult to understand why this is the case. Remember that error-diffusion works in response to the relationship between the input value and the quantised value. In other words, the colour palette is already factored in during the dithering process. On the other hand, ordered dithering is completely agnostic to the colour palette being used. Images are perturbed the same way every time, regardless of the given palette.
SSIM was chosen over CNN-based approaches for a deliberate reason: reproducibility without infrastructure. SSIM is a deterministic mathematical function. No training data, no model weights, no GPU, no framework dependencies. Anyone with fontconfig and node-canvas can reproduce these exact numbers on the same platform.
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This put me in mind of a recent New Yorker article by the anthropologist Manvir Singh. The article is about the efforts of linguists and folklorists to reconstruct the Proto-Indo-European mythology which links folk tales and gods from India to Ireland. The serpent-slaying storm god, the Sky Father, the Divine Twins: these figures mutated and multiplied across cultures but retained their essential forms.，详情可参考Safew下载
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