<?php
// The file
$filename = 'test.jpg';
$percent = 0.5;
// Content type
header('Content-type: image/jpeg');
// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;
// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width,
$new_height, $width, $height);
// Output
imagejpeg($image_p, null, 100);
?>
<?php
// The file
$filename = 'test.jpg';
// Set a maximum height and width
$width = 200;
$height = 200;
// Content type
header('Content-type: image/jpeg');
// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);
$ratio_orig = $width_orig/$height_orig;
if ($width/$height > $ratio_orig) {
$width = $height*$ratio_orig;
} else {
$height = $width/$ratio_orig;
}
// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0,
$width, $height, $width_orig, $height_orig);
// Output
imagejpeg($image_p, null, 100);
?>
<?php
function ImageCopyResampledBicubic(&$dst_image, &$src_image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w,
$src_h) {
// we should first cut the piece we are interested in from the source
$src_img = ImageCreateTrueColor($src_w, $src_h);
imagecopy($src_img, $src_image, 0, 0, $src_x, $src_y, $src_w, $src_h);
// this one is used as temporary image
$dst_img = ImageCreateTrueColor($dst_w, $dst_h);
ImagePaletteCopy($dst_img, $src_img);
$rX = $src_w / $dst_w;
$rY = $src_h / $dst_h;
$w = 0;
for ($y = 0; $y < $dst_h; $y++) {
$ow = $w; $w = round(($y + 1) * $rY);
$t = 0;
for ($x = 0; $x < $dst_w; $x++) {
$r = $g = $b = 0; $a = 0;
$ot = $t; $t = round(($x + 1) * $rX);
for ($u = 0; $u < ($w - $ow); $u++) {
for ($p = 0; $p < ($t - $ot); $p++) {
$c = ImageColorsForIndex($src_img, ImageColorAt($src_img, $ot + $p, $ow + $u));
$r += $c['red'];
$g += $c['green'];
$b += $c['blue'];
$a++;
}
}
ImageSetPixel($dst_img, $x, $y, ImageColorClosest($dst_img, $r / $a, $g / $a, $b / $a));
}
}
// apply the temp image over the returned image and use the destination x,y coordinates
imagecopy($dst_image, $dst_img, $dst_x, $dst_y, 0, 0, $dst_w, $dst_h);
// we should return true since ImageCopyResampled/ImageCopyResized do it
return true;
}
?>
Источники:
- 1-3 - php.net