PHP | imagecopyresampled() function
The imagecopyresampled() function is an inbuilt function in PHP which is used to copy a rectangular portion of one image to another image, smoothly interpolating pixel values so that, in particular, reducing the size of an image still retains a great deal of clarity.
Syntax:
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:This function accepts ten parameters as mentioned above and described below:
- $dst_image: It specifies the destination image resource.
- $src_image: It specifies the source image resource.
- $dst_x: It specifies the x-coordinate of destination point.
- $dst_y: It specifies the y-coordinate of destination point.
- $src_x: It specifies the x-coordinate of source point.
- $src_y: It specifies the y-coordinate of source point.
- $dst_w: It specifies the destination width.
- $dst_h: It specifies the destination height.
- $src_w: It specifies the source width.
- $src_h: It specifies the source height.
Return Value: This function returns TRUE on success or FALSE on failure.
Below given programs illustrate the imagecopyresampled() function in PHP:
Program 1 (Resample image to half of its width and height):
<?php
list( $width , $height ) = getimagesize (
$new_width = $width * 0.5;
$new_height = $height * 0.5;
$image_p = imagecreatetruecolor( $new_width , $new_height );
$image = imagecreatefromjpeg(
imagecopyresampled( $image_p , $image , 0, 0, 0, 0, $new_width , $new_height , $width , $height );
header( 'Content-Type: image/jpeg' );
imagejpeg( $image_p , null, 100);
?>
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Output:
Program 2 (Resample image with a fixed width and height):
<?php
$width = 300;
$height = 300;
list( $width_orig , $height_orig ) = getimagesize (
$image_p = imagecreatetruecolor( $width , $height );
$image = imagecreatefromjpeg(
imagecopyresampled( $image_p , $image , 0, 0, 0, 0, $width , $height , $width_orig , $height_orig );
header( 'Content-Type: image/jpeg' );
imagejpeg( $image_p , null, 100);
?>
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Output:
Reference: https://www.php.net/manual/en/function.imagecopyresampled.php
Last Updated :
30 Jan, 2020
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