W3C home > Mailing lists > Public > www-style@w3.org > December 2000

RE: Relative colors in CSS?

From: Ian Brockbank <i.brockbank@indigovision.com>
Date: Mon, 18 Dec 2000 04:04:16 -0500 (EST)
Message-ID: <c=US%a=_%p=Indigo_Active_Vi%l=CRIANLARICH-001218085906Z-6331@crianlarich.indigo-avs.com>
To: "'www-style@w3.org'" <www-style@w3.org>
miki.wiik@linuxsupport.to wrote:

> Do existing CSS standards, or ones being planned, include a 
> way to define colors relatively to their parents? 
> 
> Example:
> 
> BODY {color : #CCCC99}
> 
> P {color : darker}
> 
> [snip]
>
> A suggestion for different values: 
> Brighter, decreases all RGB values by, say 5%. 
> Darker, increases all RGB values by 5%. 
> +red, increase Red value by 5%. 
> -red, decrease Red value by 5%
> ++ by 10%. 
> +++ by 15%... 
> and combinations (or shorthand) +red --green +++blue

This sounds a nice idea.  How about + and - for colours moving to the
next in the "safe" collection - ie +-#33?  Or is that too coarse?

Ian
--
IndigoVision Ltd                 http://www.indigovision.com/
The Edinburgh Technopole,  Bush  Loan,  Edinburgh,  EH26  0PJ
Tel: [+44] (0)131 475 7200         Fax: [+44] (0)131 475 7201
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> -----Original Message-----
> From: miki.wiik@linuxsupport.to [mailto:miki.wiik@linuxsupport.to]
> Sent: 16 December 2000 21:28
> To: w3.org mailing Style
> Subject: Relative colors in CSS?
> 
> 
> Hi.
> 
> Do existing CSS standards, or ones being planned, include a 
> way to define colors relatively to their parents? 
> 
> Example:
> 
> BODY {color : #CCCC99}
> 
> P {color : darker}
> 
> The reason I'm looking for this sort of solution is that 
> quite often when designing pages I use a set of colors that 
> are more or less variations of the same basic color. The 
> background is a light tone, the following layer (div) a bit 
> darker, the following even darker plus a bit more red, etc. 
> 
> Since almost all other values in CSS can be either absolute 
> or relative (to their parent), it seems only natural that 
> colors would also. 
> 
> A suggestion for different values: 
> Brighter, decreases all RGB values by, say 5%. 
> Darker, increases all RGB values by 5%. 
> +red, increase Red value by 5%. 
> -red, decrease Red value by 5%
> ++ by 10%. 
> +++ by 15%... 
> and combinations (or shorthand) +red --green +++blue
> 
> Having a way to define relative colors would IMO improve 
> scalability (the author would only have to define one 
> starting colour, that could easily be replaced by User 
> stylesheets) and thus increase overall flexibility.
> 
> Regards, Miki Wiik
> 
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> <HTML><HEAD>
> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
> <META content="MSHTML 5.50.4522.1800" name=GENERATOR>
> <STYLE></STYLE>
> </HEAD>
> <BODY bgColor=#ffffff>
> <DIV>Hi.</DIV>
> <DIV>&nbsp;</DIV>
> <DIV>Do existing CSS standards, or ones being planned, 
> include a way to define 
> colors relatively to their parents? </DIV>
> <DIV>&nbsp;</DIV>
> <DIV>Example:</DIV>
> <DIV>&nbsp;</DIV>
> <DIV>BODY {color : #CCCC99}</DIV>
> <DIV>&nbsp;</DIV>
> <DIV>P {color : darker}</DIV>
> <DIV>&nbsp;</DIV>
> <DIV>The reason I'm looking for this sort of solution is that 
> quite often when 
> designing pages I use a set of colors that are more or less 
> variations of the 
> same basic color.&nbsp;The background is a light tone, the 
> following layer 
> (div)&nbsp;a bit darker, the following even darker plus a bit 
> more red, etc. 
> </DIV>
> <DIV>&nbsp;</DIV>
> <DIV>Since almost all other values in CSS can be either 
> absolute or relative (to 
> their parent), it seems only natural that colors would also. </DIV>
> <DIV>&nbsp;</DIV>
> <DIV>A&nbsp;suggestion for&nbsp;different values: </DIV>
> <DIV>Brighter, decreases all RGB values by, say 5%. </DIV>
> <DIV>Darker, increases all RGB values by 5%. </DIV>
> <DIV>+red, increase Red value by 5%. </DIV>
> <DIV>-red, decrease Red value by 5%</DIV>
> <DIV>++ by 10%. </DIV>
> <DIV>+++ by 15%... </DIV>
> <DIV>and combinations (or shorthand)&nbsp;+red --green +++blue</DIV>
> <DIV>&nbsp;</DIV>
> <DIV>Having a way to define relative colors would IMO improve 
> scalability (the 
> author would only have to define one starting colour, that 
> could easily be 
> replaced by User stylesheets) and thus increase overall 
> flexibility.</DIV>
> <DIV>&nbsp;</DIV>
> <DIV>Regards, Miki Wiik</DIV>
> <DIV>&nbsp;</DIV></BODY></HTML>
> 
Received on Monday, 18 December 2000 06:05:57 GMT

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