Re: 24bit Color to 8 bit conversion problem

Posted by Thomas Boudier-2 on
URL: http://imagej.273.s1.nabble.com/t-for-tabulation-to-the-log-window-tp3700755p3700759.html

Yasunari Tosa a écrit :

> Hi,
>
> This happens on ImageJ 1.36b (I have not tested this on the latest).
> When I load an 24 bit color image, then Image->8bit creates all color
> becomes equally
> added, i.e. (R,G,B) = (255, 0,0) or (0, 255, 0) or (0, 0, 255) does
> not matter. All becomes 85.
>
> I think that 24 bit color -> 8 bit should use the NTSC conversion
> routine:
>      val = 0.114*B+ 0.587*G+0.299*R
>
> Is there a reason why the conversion was not done this way?

Hi,

You can use the NTSC weights for RGB conversion by selecting the
"weighted RGB conversion" in the menu edit/options/conversions (V1.38).

Thomas
>
> Thank you.
>
> Tosa
>


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 Thomas Boudier, MCU Université Pierre et Marie Curie
 Imagerie Intégrative,Institut Curie - INSERM U759.
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