Darken and lighten color?

I'm looking for a nice alithogram to darken and lighten a color by a
certain ammount. I know this isn't strictly a PHP question, but I'm
doing it in PHP and there isn't anywhere better to ask.

--
The above message is encrypted with double rot13 encoding. Any unauthorized attempt to decrypt it will be prosecuted to the full extent of the law.

--- Leif K-Brooks <eurleif@buyer-brokerage.com> wrote:
> I'm looking for a nice alithogram to darken and lighten a color by a
> certain ammount.

Maybe you mean algorithm? :-)

To lighten, increase RGB values by 10% each. To darken, decrease RGB values by
10% each. Maybe replace 10 with whatever the "certain amount" is.

Is that all you're wanting to do?

Chris

=====
My Blog
http://shiflett.org/
HTTP Developer's Handbook
http://httphandbook.org/
RAMP Training Courses
http://www.nyphp.org/ramp

Chris Shiflett wrote:

>--- Leif K-Brooks <eurleif@buyer-brokerage.com> wrote:
>
>
>>I'm looking for a nice alithogram to darken and lighten a color by a
>>certain ammount.
>>
>>
>
>Maybe you mean algorithm? :-)
>
>
Yep. My ability to spell decreases 5% every 15 minutes after 12AM.

>To lighten, increase RGB values by 10% each. To darken, decrease RGB values by
>10% each. Maybe replace 10 with whatever the "certain amount" is.
>
>
But what do I do with something like 40,40,255? What happens to the 255?

>Is that all you're wanting to do?
>
>
Yup.


--
The above message is encrypted with double rot13 encoding. Any unauthorized attempt to decrypt it will be prosecuted to the full extent of the law.

> But what do I do with something like 40,40,255? What happens to the 255?

You just have to leave it at 255. That's what Illustrator does.

Edward Dudlik
"Those who say it cannot be done
should not interrupt the person doing it."

wishy washy | www.amazon.com/o/registry/EGDXEBBWTYUU



----- Original Message -----
From: "Leif K-Brooks" <eurleif@buyer-brokerage.com>
To: <shiflett@php.net>
Cc: "Php-General (E-mail)" <php-general@lists.php.net>
Sent: Sunday, 19 October, 2003 01:18
Subject: Re: [php] Darken and lighten color?


Chris Shiflett wrote:

>--- Leif K-Brooks <eurleif@buyer-brokerage.com> wrote:
>
>
>>I'm looking for a nice alithogram to darken and lighten a color by a
>>certain ammount.
>>
>>
>
>Maybe you mean algorithm? :-)
>
>
Yep. My ability to spell decreases 5% every 15 minutes after 12AM.

>To lighten, increase RGB values by 10% each. To darken, decrease RGB values by
>10% each. Maybe replace 10 with whatever the "certain amount" is.
>
>
But what do I do with something like 40,40,255? What happens to the 255?

>Is that all you're wanting to do?
>
>
Yup.


--
The above message is encrypted with double rot13 encoding. Any unauthorized attempt to decrypt it will be prosecuted to the full extent of the law.

--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php

Becoming Digital wrote:

>You just have to leave it at 255. That's what Illustrator does.
>
>
Hmm, seems to work, thanks. Note to self: try before you ask.

--
The above message is encrypted with double rot13 encoding. Any unauthorized attempt to decrypt it will be prosecuted to the full extent of the law.

Leif K-Brooks wrote:
> Note to self: try before you ask.

I say that to myself about 100 times each day. ;)

Edward Dudlik
"Those who say it cannot be done
should not interrupt the person doing it."

wishy washy | www.amazon.com/o/registry/EGDXEBBWTYUU



----- Original Message -----
From: "Leif K-Brooks" <eurleif@buyer-brokerage.com>
To: "Becoming Digital" <subs@becomingdigital.com>
Cc: "Php-General (E-mail)" <php-general@lists.php.net>
Sent: Sunday, 19 October, 2003 01:42
Subject: Re: [php] Darken and lighten color?


Becoming Digital wrote:

>You just have to leave it at 255. That's what Illustrator does.
>
>
Hmm, seems to work, thanks. Note to self: try before you ask.

--
The above message is encrypted with double rot13 encoding. Any unauthorized attempt to decrypt it will be prosecuted to the full extent of the law.