Re: "Grayscale" values for RGB images

Posted by Tony Shepherd on Feb 14, 2007; 10:00am
URL: http://imagej.273.s1.nabble.com/Grayscale-values-for-RGB-images-tp3700260p3700270.html

It sounds like you have a 'greenscale' image, just like a greyscale image
but only using the green channel and all the red/blue values are zero- is
this true? or do you have a full colour image (using all of RGB) that just
'looks mainly green'.
If it is true then you are looking at the nonzero pixel value, the green
value, which is the same as it would be if this were a greyscale image
(think of a greyscale image as red=green=blue at each pixel)

Hope that helps

>From: Jacqui Ross <[hidden email]>
>Reply-To: ImageJ Interest Group <[hidden email]>
>To: [hidden email]
>Subject: "Grayscale" values for RGB images
>Date: Wed, 14 Feb 2007 10:24:49 +1300
>
>Dear All,
>
>
>
>I think I must have missed an update somewhere. Usually, if I want to
>measure intensity of RGB images, I have to change them to grayscale
>first (8bit) but it seems that I don't need to include this extra step
>now. I seem to get the same results whether I change my green image to
>grey or not. Is this correct?
>
>
>
>Cheers,
>
>
>
>Jacqui
>
>
>
>Jacqueline Ross
>Biomedical Imaging Research Unit
>School of Medical Sciences
>Faculty of Medical & Health Sciences
>The University of Auckland
>Private Bag 92019
>Auckland, NEW ZEALAND
>
>Tel: [phone] Ext 87438
>Fax: [phone]
>
>http://www.health.auckland.ac.nz/biru/
><http://www.health.auckland.ac.nz/biru/>
>
>

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