Before the rush

Before the rush
by evan-pak

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In the description, my smartphone camera describes the 'mono' setting as being black and white, but it appears more to be grayscale - am I right in this assumption?

Also, if it is grayscale, how is it calculated from the original RGB value? Is there a way of testing what conversion has taken place?

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up vote 2 down vote accepted

Monochrome and black and white and grayscale are used randomly these days for the same grayscale thing. Even though strictly speaking Black and white is 2-shade images, monochrome can be any single colour (like old monitors in yellowish), and grayscale is the real term people are looking for.

The computation from the bayer pattern is usually using the Y component from the Y'CbCr compressed image. It can be different in your model but I doubt it. It is a weighted sum of the R,G,B values based on human sensitivities. It is how yellow gets brighter than cyan and magenta (pure mean of R,G and B will result in a dark gray for yellow).

Y = 0.299*R+0.587*G+0.114*B

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Excellent, I was hoping that this would be the case. Thank you for your answer (+1 and accept). – user20509 Jun 26 '13 at 23:44

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