what RGB is blue?

[Bob Sneidar]

It would have to be higher that both the first two by a significant margin. Arbitrarily I would say if higher by a factor of 3, but if there is any standard about this I don't know it. 

Bob


On Jul 1, 2011, at 2:44 AM, Terry Judd wrote:

> I think if the blue value is the largest of the 3 values then the colour
> will always be a blue of sorts.
> 
> Terry...
> 
> 
> On 01/07/2011 07:39 PM, "Tiemo Hollmann TB" <toolbook at kestner.de> wrote:
> 
>> Hello,
>> 
>> I am taking the mousecolor at different points from an image by script (not
>> by clicking). I would like to analyse if the color I've taken is a "kind of
>> blue", or another color. I want to change the backgroundcolor of an image.
>> The background is always blue, but different blues and changing over the
>> background. So what I want to do is to verify, what is background and what
>> is foreground of my image.
>> 
>> 100% pure blue would be 0,0,255. But for a human being 25,75,130 (greyblue)
>> is also still blue, but 240,20,180 is pink, though the third RGB value is
>> higher as in my greyblue.
>> 
>> So I can't just check only the third RGB value, neither the sum or cross
>> total. Has anybody ever heard, if you can define at all by math "what is
>> blue"?
>> 
>> Any color specialist around here?
>> 
>> Tiemo
>> 
>> 
>> 
>> 
>> 
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> 
> --
> Dr Terry Judd | Senior Lecturer in Medical Education
> Medical Education Unit
> Melbourne Medical School
> The University of Melbourne
> 
> 
> 
> 
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