On Sat, Sep 30, 2000 at 07:56:25PM -0700, David Mosberger-Tang wrote:
> >>>>> On Sat, 30 Sep 2000 17:13:15 +0200, Henning Meier-Geinitz <hmg-ml@gmx.de> said:
>
> Henning> For all other bit depths, larger values mean more red,
> Henning> green, blue, or white.
>
> This is potentially very confusing. Depending on whether you're
> dealing with a subtractive or additive color synthesis, "more color"
> could mean darker or brighter, respectively. I no expert in color
> theory, but perhaps "larger values correspond to more luminous
> (``brighter'') pixels" would be more accurate and but still clear?
No experts here, I will crib from the TIFF documentation, while trying
to stay with SANE's terminology. Actually I think there's little risk
of people trying to do image acquisition with subtractive color models
(think about it). How about:
In frames of type SANE_FRAME_GRAY, when the bit depth is 1 there are
only two sample values possible, 1 represents minimum intensity (black)
and 0 represents maximum intensity (white).
For all other bit depth and frame type combinations, a sample value of 0
represents minimum intensity and larger values represent increasing
intensity.
(I think TIFFs choice of vocabulary "intensity" is appropriate because
just what /is/ brighter about more xray radiation or infrared?)
Actually, can anyone tell me (from practical experience) whether I
am right that this only affects SANE_FRAME_GRAY? Do we have devices
that actually send 1bit RGB frames?
Nick.
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