Re: RGB conversion to 8 bit gray scale
- From: "edward.s.meinel@xxxxxxxx" <meinel@xxxxxxxx>
- Date: 26 Sep 2005 08:10:35 -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?
The general formula is
gray = R*red + G*green + B*blue
where
R + G + B = 1
All conversions are weighted. If you want UNIFORM weights, then
R=G=B=1/3.
> Let's say you have a TIFF of RGB intensities (but Red channel is
> empty), and you want to convert it to 8bit grayscale images.
Then R=0, G+B=1.
> would you hav to rolling ball bacground subtract the RGB image then
> split them using one of the conversion method?
>
> or do you split them using one of the conversion methods and then
> background subtract using rolling ball?
What do you mean by "split"? Did you really mean "combine"?
Ed
.
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- RGB conversion to 8 bit gray scale
- From: sean_incali
- RGB conversion to 8 bit gray scale
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