> > From: Mark Roberts <[EMAIL PROTECTED]> > Date: 2005/08/26 Fri PM 01:11:21 GMT > To: pentax-discuss@pdml.net > Subject: Re: Film scanner question > > mike wilson <[EMAIL PROTECTED]> wrote: > > >> From: "Herb Chong" <[EMAIL PROTECTED]> > >> > >> the real test is scanning greens. the eye is most sensitive in that color > >> area. > >> > >Care to elucidate? > > 1: The green channel of a digital image very closely corresponds to the > overall luminance of the image. > 2: The human eye is also most sensitive in its "green channel" so to > speak. > 3: Item #2 is probably an evolutionary response to #1 > 4: Digital camera sensors have twice as many green pixels as red or blue > (deliberately so - obviously! - because of #1 and #2)
OK. But this was a discussion of colour depth - that is not the same as luminance, is it? m ----------------------------------------- Email sent from www.ntlworld.com Virus-checked using McAfee(R) Software Visit www.ntlworld.com/security for more information
