[scilab-Users] conversion from RGB to grayscale

[Adrien Vogt-Schilb]

Hi

I do not know how scilab does it, but i've been tought (in a general 
context) to use the luminance when doing this. More info here: 
http://en.wikipedia.org/wiki/Luminance_%28relative%29

According to this method, one should compute
Y = 0.2126 R + 0.7152 G + 0.0722 B

and then use the color (Y,Y,Y) as a gray tone (in the RGB space).
I did not check wether Scilab actually does this.

PS: the NASA has a great page on color usage, contrast, and more: 
http://colorusage.arc.nasa.gov/guidelines.php

Best Regards
AVS

01/08/2012 12:31, Damo wrote:
> I am curious as to what is the formula used to convert RGB images to
> grayscale, using the command RGB2Gray.
>
> Any information will be helpful.
>
>
>
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