note 24424 added to function.imagecopyresized
| From: | info at free-dev dot com | Date: | Thu, 15 Aug 2002 18:40:08 +0000 |
| Subject: | note 24424 added to function.imagecopyresized | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-35084@lists.php.net to get a copy of this message | ||
Other derived function from the great ImageCopyResampleBicubic(), in PHP.
Most people just need to resize his pictures, so I wrote a more simple function to resize a picture
with the less $vars as possible... if somebody can make my function faster...
<?
######## just a sample how to use ########
$b=imagecreatefrompng ("max.png"); # i get my source picture
$bx=imagesx ($b); #source width
$by=imagesy ($b); # source height
$my=450; # new img height
$mx=intval($my*$bx/$by); # new img width
# note, it's the same ratio h/w
$m=ImageResize ($b, $mx, $my);
# the function generates a new image, you just need to send it in a $var imagepng ($m); # i show
you my new picture
######## the function ########
function ImageResize (&$src, $x, $y) {
/*
Function derived from ImageCopyResampleBicubic()
Original code in C, for the PHP GD Module by jernberg@fairytale.se
Port to PHP by John Jensen July 10 2001
Updated by tim@smoothdeity.com
Re-edited & optimized by TCK
*/
$dst=ImageCreate ($x, $y);
$pals=ImageColorsTotal ($src);
for ($i=0; $i<$pals; $i++) {
$colors=ImageColorsForIndex ($src, $i);
ImageColorAllocate ($dst, $colors['red'], $colors['green'],
$colors['blue']);
}
$scX =(imagesx ($src)-1)/$x;
$scY =(imagesy ($src)-1)/$y;
$scX2 =intval($scX/2);
$scY2 =intval($scY/2);
for ($j = 0; $j < ($y); $j++) {
$sY = intval($j * $scY);
$y13 = $sY + $scY2;
for ($i = 0; $i < ($x); $i++) {
$sX = intval($i * $scX);
$x34 = $sX + $scX2;
$c1 = ImageColorsForIndex ($src, ImageColorAt ($src, $sX, $y13));
$c2 = ImageColorsForIndex ($src, ImageColorAt ($src, $sX, $sY));
$c3 = ImageColorsForIndex ($src, ImageColorAt ($src, $x34, $y13));
$c4 = ImageColorsForIndex ($src, ImageColorAt ($src, $x34, $sY));
$r = ($c1['red']+$c2['red']+$c3['red']+$c4['red'])/4;
$g =
($c1['green']+$c2['green']+$c3['green']+$c4['green'])/4;
$b =
($c1['blue']+$c2['blue']+$c3['blue']+$c4['blue'])/4;
ImageSetPixel ($dst, $i, $j, ImageColorClosest ($dst, $r, $g, $b));
}
}
return ($dst);
}
?>
--
http://www.php.net/manual/en/function.imagecopyresized.php
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