Hi
Here is a better 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 != ""):
$start_red = 2; //red scale at black
$start_blue = 2.3; //blue scale at black
$red_scale = ($start_red-1)/256; //red
modifier as greyscale goes to white
$blue_scale = ($start_blue - 1)/256; //ditto for blue
//build a sepia lookup table
$sepia = array();
for($x = 0;$x < 256;$x++){
$red = intval($x * ($start_red - ($x * $red_scale)));
if($red > 255) $red = 255;
$blue = intval($x / ($start_blue - ($x *
$blue_scale)));
$sepia[$x][0] = $red;
$sepia[$x][1] = $blue;
}
$im =imagecreatefromjpeg($filename);
for($y = 0;$y < imagesy($im);$y++){
for($x = 0;$x < imagesx($im);$x++){
$pixel = imagecolorat($im, $x, $y);
$red = ($pixel & 0xFF0000) >> 16;
$green = ($pixel & 0x00FF00) >> 8;
$blue = $pixel & 0x0000FF;
$alpha = $pixel & 0x7F000000;
//get a greyscale value
$gs = intval(($red * 0.3) + ($green *
0.59) + ($blue * 0.11));
$p = $alpha | $sepia[$gs][1] | ($gs << 8)
| ($sepia[$gs][0] << 16);
imagesetpixel ($im, $x, $y, $p);
}
}
Header("Content-type: image/jpeg");
ImageJpeg($im,'',50);
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
>
>
>
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