Re: RGB conversion to 8 bit gray scale
- From: "toby" <toby@xxxxxxxxxxxxxxxxxxx>
- Date: 23 Sep 2005 21:27:57 -0700
sean_incali wrote:
> IMAGEJ doc's says...
>
> RGB images are converted to grayscale using the formula
> gray=0.299red+0.587green+0.114blue or the formula
> gray=(red+green+blue)/3
> if "Unweighted RGB to Grayscale Conversion" is checked in
> Edit/Options/Conversions (ImageJ 1.32g or later).
>
>
> I think This isn't limited to IMAGEJ but to imagin processing in
> gfeneral? what is the reason for the weighted vs unweighted conversion?
>
>
>
> When is an appropriate time to use the unweighted conversion method?
> (or for that matter when is appropriate to ue the weighted conversion?)
Those commonly used weights correspond to NTSC TV, and don't
necessarily correspond to a perceptual or other tristimulus models.
See:
http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC9
--T
>
> ...
>
> sean
.
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