Usage of php image processing function imagecopyresampled
This article mainly introduces the usage of the PHP image processing function imagecopyresampled, and analyzes the function, parameters, and usage of the imagecopyresampled function in detail with examples. Friends in need can refer to it
Grammar
Copy code The code is as follows:
bool imagecopyresampled ( resource $dst_image , resource $src_image , int $dst_x , int $dst_y , int $src_x , int $src_y , int $dst_w , int $dst_h , int $src_w , int $src_h )
Parameters
| dst_image | Target image connection resource. |
| src_image | Source image connection resource. |
| dst_x | Target X coordinate point. |
| dst_y | Target Y coordinate point. |
| src_x | The X coordinate point of the source. |
| src_y | The Y coordinate point of the source. |
| dst_w | Target width. |
| dst_h | Target height. |
| src_w | The width of the source image. |
| src_h | The height of the source image. |
Returns TRUE on success, or FALSE on failure.
Case
Case (image cropping):
<?php $targ_w = $targ_h = 150; // 设置目标宽度与高度 $jpeg_quality = 90; // 图片质量90，满分为100 $src = 'demo_files/pool.jpg'; // 被处理的图片 $img_r = imagecreatefromjpeg($src); // 获取原图 $dst_r = ImageCreateTrueColor( $targ_w, $targ_h ); // 获取新图 imagecopyresampled($dst_r,$img_r,0,0,$_POST['x'],$_POST['y'], $targ_w,$targ_h,$_POST['w'],$_POST['h']); // 目标图 源图 目标X坐标点 目标Y坐标点 源的X坐标点 源的Y坐标点 目标宽度 目标高度 源图宽度 源图高度 header('Content-type: image/jpeg'); imagejpeg($dst_r,null,$jpeg_quality); // 输出图象到浏览器或文件 ?>
Case 2 (resampling) ：
<?php
// 源文件
$filename = '1.jpg';
// 设置最大宽高
$width = 400;
$height = 400;
// Content type
header('Content-Type: image/jpeg');
// 获取新尺寸
list($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;
}
// 重新取样
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
// 输出
imagejpeg($image_p, null, 100);
?>Attached are three ideas for uploading pictures
1 .Select the picture, submit the form, the server handles the upload uniformly, save the path
2.Select the picture, upload, get the path, submit the form, save the path
3. Select the picture, upload it to the server, obtain the picture from the server through some means, and save it locally
The above is the entire content of this article, I hope it will be helpful to everyone learning helps.
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