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Comb out honeycomb

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Norman Frizzle
Comb out honeycomb
on Apr 30, 2005 at 8:00:47 pm

Remember photos with the so-called 'satin' finish? In fact, they were printed on paper pressed with a micro-fine honeycomb pattern. The result when scanning such photos reproduces not just the photo but also this pattern, which is undesirable for most practical purposes. For example, in re-printing or reproduction on video, the photo is likely to produce a moire effect.

Observed at a pixel level, it is clear that the hexagon shape itself repeats predictably. The only variability is the degree to which it reflects light on one side of the hexagon and suppresses light on the other. But this variability is in direct relation to the actual photo's luminance itself.

So how can I minimize the honeycomb pattern? That is, what technique can I use to counter where the light catches on those hexagon edges brightened with darker pixels and, on the opposite sides, where the edge is darkered countered by lightened pixels?

Help me.


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