Re: Correction To Converting Colors

Susan:

Wow !!!

As Barry Fitzgerald said in that great morning-after scene in "The Quiet
Man", - - -Formidable!!

Even a "math major" like myself can't help but feel both greatly impressed
and just a tiny bit intimidated.

So--for those not at home with numbers, I feel I should respectively point
out that there are at least a half-dozen Color Picker programs available for
free download that will do the math for you.

Some, like the one I downloaded from the Netscape site a year or so ago,
will give values for most color systems "on the fly". You can "copy" a
color--using numbers or the "picker" and convert to your hearts content.
Then you can just plug in the values in your favorite graphics program.

But Please !! -- I don't mean to downplay Susan's formula. It's a very
complete and credible effort on a serious, complex subject.

Best wishes
Ted Temer
Temercraft Designs Redding, CA
temer(at)c-zone.net
www.temercraft.com/novels/
www.newsredding.com/
www.ramac-rc.org/


> Just wanted to publish a correction to a recent post I had done on using
> Photoshop to remove white lines (pixels) around an image.  In my example
of
> taking a number from Dreamweaver and trying to convert it to RGB in
> Photoshop, I mistakenly thought you could take the pairs of numbers and
> divide it into the RGB columns.  Short of an alien abduction, I have no
good
> reason for this logic.
>
> However, a kind reader caught my error and sent it to me privately.  After
> receiving his permission, I am sharing it with the list in case there are
> other people who may not know how to convert colors and may not even
realize
> that they don't know.  See below.
>
> Regards,
> Susan V.
>
> (TO CONVERT COLORS INTO RGB)
>
>
> First, some quick basics: The 0-9 HEX (BASE16) digits are the same value
> as the 0-9 DECIMAL (BASE10) digits, and the A-F HEX digits are the same as
> the 10-15 DECIMAL numbers.  After "0F" HEX comes "10" HEX.
>
> DECIMAL:  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 ... 31 32
> HEX    : 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 ... 1F 20
>
> In DECIMAL (the number "18" represents 1 ten and 8 ones, or 10+8=18, which
> you are famliar with.  The HEX number "12" represents (in DECIMAL) 1
> sixteen and 2 ones, or 16+2=18.  You just did your first conversion.
> Here are the place equivalents (both are given in DECIMAL values):
>
> For the number     1234
>                   /// |
>                  // | |
>                 //  | |
>                / |  | |
>               /  |  | |
> DECIMAL: 1000 100 10 1  (each place muliplied by 10)( 1234=1234)
> HEX    : 4096 256 16 1  (each place multplied by 16)(#1234=4660)
>                               (1x4096)+(2x256)+(3x16)+(4x1)=4660
>                                       (4096)+(512)+(48)+(4)=4660
>
> You just did your second conversion, with a larger HEX number than you'll
> probably realistically work with.  "FF" HEX is probably the largest you'll
> use.
> And now for the conversions of "#CC9966" and "#FF":
>
> CC=(12x16)+(12x1)   99=(9x16)+(9x1)   66=(6x16)+(6x1)   FF=(15x16)+(15x1)
>   =(192)+(12)         =(144)+(9)        =(96)+(6)         =(240)+(15)
>   =204                =153              =102              =255
>
> Now that you know the "pattern" all the "mystery and magic" are gone....
>
>
>

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