Recovering RGB values from a colour attribute

I feel this ought to be an easy one, except that nothing I do will work and
I can't find any help in my books!

I have the statement

mycolour=y.style.backgroundColor

which successfully picks up the colour of an element, and allows me to apply
that colour to some other element. But I now want to make smooth
adjustments to the colour by accessing the individual RGB components of
"mycolour". Can anyone tell me what Javascript statements I need?

David Robinson

David Robinson wrote:

I feel this ought to be an easy one, except that nothing I do will
work and I can't find any help in my books!

The color code consists of the RGB in hexadecimal:

#00aaff would have following RGB-Values:

R = 00 = 0
G = aa = 170
B = ff = 255

To solve your problem you need functions that can convert hexa<>decimal
numbers:

You can write this script by yourself or you can use existing scripts:

http://www.skyzyx.com/scripts/convert.php

Hi Adrian and Andre

I think I've answered this one for myself. The problem seems to be that if
I declare an element to be coloured red, then the stored attribute for that
element appears to be the 3-character string "red", and not, as one would
have expected, the string "#FF0000". It stands to reason then that there is
no way of subsequently processing the colour attribute in the way you
suggest. On the other hand if I actually declare the original colour as the
hex string "#FF0000", then everything works fine.

Quite naturally I would have expected the colour "red" to be translated into
the 6-character hex string immediately the browser encounters it, but it
seems that ain't the case!!

Many thanks for your efforts to answer my problem.

David

"Andre Herbst" <moorkonig (AT) compuserve (DOT) de> wrote

David Robinson wrote:
I feel this ought to be an easy one, except that nothing I do will
work and I can't find any help in my books!

The color code consists of the RGB in hexadecimal:

#00aaff would have following RGB-Values:

R = 00 = 0
G = aa = 170
B = ff = 255

To solve your problem you need functions that can convert hexa<>decimal
numbers:

You can write this script by yourself or you can use existing scripts:

http://www.skyzyx.com/scripts/convert.php