imagecopyresampled

Description

imagecopyresampled() copies 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. Returns TRUE on success or FALSE on failure.

dst_image is the destination image, src_image is the source image identifier. If the source and destination coordinates and width and heights differ, appropriate stretching or shrinking of the image fragment will be performed. The coordinates refer to the upper left corner. This function can be used to copy regions within the same image (if dst_image is the same as src_image) but if the regions overlap the results will be unpredictable.

Examples

Example 1. Simple example This example will resample an image to half its original size. <?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); ?>

Example 2. Resampling an image proportionally This example will display an image with the maximum width, or height, of 200 pixels. <?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); ?>

See Also

imagecopyresized()