Re: SANE & exposure times

Didier Carlier (Didier.Carlier@sema.be)
Thu, 29 Jul 1999 10:52:25 +0200

ewald@pobox.com said:
> My concern is not changing the values but getting them from the
> backend so the frontend knows how to make sense out of the RGB values.
> I think we could use SANE_NAME_SCAN_EXPOS_TIME_R (defined in sane/
> saneopts.h) and friends for that. That is, the frontend should check
> these options and if they are present then it should divide the RGB
> values by their corresponding exposure time.

What is the meaning of an RGB value divided by a time ? Nothing says
for instance that the sensitivity of the detectors is the same for all
colors so that even for a picture that looks perfectly grey, you would get
completely different values for the quotients.

I'm just curious to understand in what application that division makes sense.

Best regards,
Didier

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