Convert RGB to HSV

[Richmond Mathewson]

Oh dear, I've just succeeded in disturbing myself quite effectively by
downloading something that converts RGB to CMYK, except it doesn't !!!!!!

ColourUtility

http://www.sqonk.com.au/

It converts something called  RGB(A) (which has 4 values seemingly 
bearing little
relation to 3-value RGB) to CMYK.

Randall Reetz wrote:
> Trying to do something isnt always the same as doing that something.  Success remains elusive... But i am getting closer.  Trying to cut every available corner along the way (isnt that how evolution works).  The human eye isnt perfect... But we get by.  Color space is confusing.  Are two and three color combinations representable in HSV color space?  I dont see how.  H seems to be a single point along a pure wave length spectrum.  No?  I had better read up.
> -----Original Message-----
> From: "Richmond Mathewson" <richmondmathewson at gmail.com>
> To: "How to use Revolution" <use-revolution at lists.runrev.com>
> Sent: 7/5/2009 2:32 PM
> Subject: Re: Convert RGB to HSV
>
> Well, you are either way ahead of me, or way "out there"; either way
> I won't pretend to understand.
>
> Suffice it to say, my wee stack "cuts the mustard" re converting RGB to 
> HSV and HSL values.
>
> Randall Reetz wrote:
>   
>> The reason it matters to me has nothing to do with printing.  I am writing AI and part of this needs to learn how to recognize objects (semantically) from photos and video.  The starter functions i am handing to this self learning pattern engine are ways of converting bitmaps into vector objects.  To swim the math of a pixel grid and pull objects out involves knowing where a region of color is person and where it ain't.  That means knowing that a darker part of an arm is still the arm.  That means knowing the difference between hue delta and brightness delta.  Of course this gets harry when the color of the lighting varies accross an image.  But i can parse for and adjust for that.  RGB vals don't in them selves carry the data my object parser needs to determine where an arm ends and where it doesnt.  Actually, i dont need seporate S and V values... just Hue as differenciated from Brightness.
>>
>> -----Original Message-----
>> From: "Richmond Mathewson" <richmondmathewson at gmail.com>
>> To: "How to use Revolution" <use-revolution at lists.runrev.com>
>> Sent: 7/5/2009 12:33 PM
>> Subject: Re: Convert RGB to HSV
>>
>> The Wikipedia article I referenced in an earlier posting in this thread
>> is really quite comprehensive, including 3-d diagrams of how this
>> is conceptualised.
>>
>> I generally find the algorithms on Wikipedia are very useful in
>> this sort of case, as, am not going to get out my slide-rule and
>> work out the whole jingbang for myself - this life being too short.
>>
>> Frankly, as a simple type of chap, who only prints out coloured
>> stuff rarely, I am perfectly happy with RGB.
>>
>> I just got piqued when somebody esle was writing about HSV (err, HSB ???)
>> and so on, and thought "I wonder if I can do that?" as, honestly, had a very
>> unstimulating few days (went to a funeral, helped in Bulgaria's 
>> parliamentary
>> elections . . . need I say more) and felt a need to stretch the mind a spot_______________________________________________
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