Archived posting to the Leica Users Group, 2011/07/05

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Subject: [Leica] B&W on a digital camera
From: kanner at acm.org (Herbert Kanner)
Date: Tue, 5 Jul 2011 19:09:27 -0700
References: <mailman.1640.1309894598.1103.lug@leica-users.org> <8CE09877216EF8E-1B84-425A@Webmail-m113.sysops.aol.com>

I think your second hypothesis describes what happens. I base this on 
Mat Colson's book on Lightroom 3 where he points out that, for 
example, increasing brightness on green, when processing a B&W 
rendition, will lighten the portion of the B&W image that is grass.

Herb



>Technical question:
>When a B&W picture is made with a digital camera incorporating a
>Bayer filter, are all the pixels on the sensor used to form the
>image? Or, as in TV, is the B&W image derived from the green pixels?
>Secondly, if a color image is converted to B&W in Photoshop or a
>similar program, does the program simply desaturate all the colors,
>transform the colored pixel intensity to a greyscale equivalent, or
>use an algorithm to compose the image?
>I was asked this question at a photography show and I didn't have an
>answer. Perhaps a Lugger knows.
>Larry Z
>
>
>
>_______________________________________________
>Leica Users Group.
>See http://leica-users.org/mailman/listinfo/lug for more information

-- 
Herbert Kanner
kanner at acm.org
650-326-8204

Do not meddle in the affairs of cats,
for they are subtle and will pee
on your computer!


In reply to: Message from lrzeitlin at aol.com (lrzeitlin at aol.com) ([Leica] B&W on a digital camera)