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Please explain subsampling and justify the defaults #11

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jwilk opened this issue Mar 15, 2016 · 1 comment
Open

Please explain subsampling and justify the defaults #11

jwilk opened this issue Mar 15, 2016 · 1 comment
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jwilk commented Mar 15, 2016

Issue reported by @jsbien:

Why the default foreground subsampling is larger than the default background one?
@jwilk jwilk added the task label Nov 13, 2016
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jwilk commented Nov 13, 2016

The default settings (--fg-subsample=6, --bg-subsample=3) were chosen so that I can use djvumake to compose DjVu by default.
djvumake uses these subsample ratios, and they are not configurable.
Intuitively, lower quality for the foreground layer makes sense, because in the typical case it's solid color (most often black).

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