note 20742 deleted from function.imagecopyresampled by aidan
| From: | aidan@php.net | Date: | Mon, 04 Oct 2004 09:46:01 +0000 |
| Subject: | note 20742 deleted from function.imagecopyresampled by aidan | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-77972@lists.php.net to get a copy of this message | ||
Note Submitter: scott at pawprint dot net
----
The post with the bicubic transform was very helpful - however it also suffers from ignoring the
src_x and src_y parameters - the following script is a modified version that takes them into
account.
I also commented out the color allocation (because I'm working with truecolor images)
function ImageCopyResampleBicubic ($dst_img, $src_img, $dst_x, $dst_y,$src_x, $src_y, $dst_w,
$dst_h, $src_w, $src_h) {
/*
for ($i = 0; $i < imagecolorstotal($src_img); $i++)
{
$colors = ImageColorsForIndex ($src_img, $i);
ImageColorAllocate ($dst_img, $colors['red'],$colors['green'],
$colors['blue']);
}
*/
$scaleX = ($src_w - 1) / $dst_w;
$scaleY = ($src_h - 1) / $dst_h;
$scaleX2 = $scaleX / 2.0;
$scaleY2 = $scaleY / 2.0;
for ($j = $src_y; $j < $src_y + $dst_h; $j++)
{
$sY = $j * $scaleY;
for ($i = $src_x; $i < $src_x + $dst_w; $i++)
{
$sX = $i * $scaleX;
$c1 = ImageColorsForIndex ($src_img, ImageColorAt($src_img, (int) $sX, (int) $sY +
$scaleY2));
$c2 = ImageColorsForIndex ($src_img, ImageColorAt($src_img, (int) $sX, (int) $sY));
$c3 = ImageColorsForIndex ($src_img, ImageColorAt($src_img, (int) $sX + $scaleX2, (int)
$sY + $scaleY2));
$c4 = ImageColorsForIndex ($src_img, ImageColorAt($src_img, (int) $sX + $scaleX2, (int)
$sY));
$red = (int) (($c1['red'] + $c2['red'] + $c3['red'] +
$c4['red']) / 4);
$green = (int) (($c1['green'] + $c2['green'] + $c3['green']
+ $c4['green']) / 4);
$blue = (int) (($c1['blue'] + $c2['blue'] + $c3['blue'] +
$c4['blue']) / 4);
$color = ImageColorClosest ($dst_img, $red, $green,$blue);
ImageSetPixel ($dst_img, $dst_x + $i - $src_x, $dst_y + $j - $src_y,$color);
}
}
}