Hi
Here is a small php script to create sepia images from a jpeg, put it in
the same place as your images and call it sepia.php.
Uselike this:
img src="/images/sepia.php/filename.jpg"
<?
$filename = ereg_replace("/","",$PATH_INFO);
if($filename != ""):
$im =imagecreatefromjpeg($filename);
//convert to a pallette
imagetruecolortopalette($im,1,256);
$start_red = 2.1; //red scale at black
$start_blue = 2.3; //blue scale at black
$red_scale = ($start_red - 0.9)/256; //blue modifier as
greyscale goes to white
$blue_scale = ($start_blue - 0.9)/256; //ditto for red
//loop through pallette
for($x = 0;$x < 256;$x++){
$a = array();
$a = imagecolorsforindex ($im, $x);
//calc a grayscale value
$gs = intval(($a["red"]*0.3) + ($a["green"]*.59) +
($a["blue"]*.11));
$rm = $gs * $red_scale; //calc red modifier
$bm = $gs * $blue_scale; //calc blue modifier
$red_m = $start_red - $rm;
$blue_m = $start_blue - $bm;
$r = intval($gs * $red_m); //scale red up
$g = $gs; //green no
change
$b = intval($gs/$blue_m); //scale
blue down
imagecolorset ($im, $x, $r, $g, $b);
}
Header("Content-type: image/jpeg");
ImageJpeg($im,'',30);
endif;
?>
Probably will only work with php-4+ and gd 2+
Tom
At 02:42 AM 3/3/02, Andy wrote:
>Hi there,
>
>I was recently browsing throught phpbuilder and did see the user pictures
>there.
>
>They are not black/white, but kind of brown white which look pretty cool and
>might save some disk space compared to true color.
>Here is the link:
>http://phpbuilder.com/columns/ying20000602.php3?page=1
>
>Does anybody know how to do this with GD?
>
>Thanx for any help
>
>Andy
>
>
>
>--
>PHP General Mailing List (http://www.php.net/)
>To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
