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.
- $src_h: It specifies the source height.
Return Value: This function returns TRUE on success or FALSE on failure.
Below given programs illustrate the imagecopyresampled() function in PHP:
Program 1 (Resample image to half of its width and height):
<?php // Get dimensions of new image list($width, $height) = getimagesize( // Reduce width and height to half $new_width = $width * 0.5; $new_height = $height * 0.5; // Resample the image $image_p = imagecreatetruecolor($new_width, $new_height); $image = imagecreatefromjpeg( imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); // Output the image to browser header('Content-Type: image/jpeg'); imagejpeg($image_p, null, 100); ?> |
Output:
Program 2 (Resample image with a fixed width and height):
<?php // Set a fixed height and width $width = 300; $height = 300; // Get image dimensions list($width_orig, $height_orig) = getimagesize( // Resample the image $image_p = imagecreatetruecolor($width, $height); $image = imagecreatefromjpeg( imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig); // Output the image header('Content-Type: image/jpeg'); imagejpeg($image_p, null, 100); ?> |
Output:
Reference: https://www.php.net/manual/en/function.imagecopyresampled.php
