(PHP 4, PHP 5, PHP 7)
imagecopyresized — Copy and resize part of an image
$src_h) : bool
imagecopyresized() copies a rectangular
portion of one image to another image.
dst_image is the destination image,
src_image is the source image identifier.
In other words, imagecopyresized() will take a
rectangular area from
src_image of width
src_w and height
and place it in a rectangular area of
dst_w and height
at position (
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.
Destination image resource.
Source image resource.
x-coordinate of destination point.
y-coordinate of destination point.
x-coordinate of source point.
y-coordinate of source point.
TRUE on success or
FALSE on failure.
Example #1 Resizing an image
This example will display the image at half size.
// File and new size
$filename = 'test.jpg';
$percent = 0.5;
// Content type
// Get new sizes
list($width, $height) = getimagesize($filename);
$newwidth = $width * $percent;
$newheight = $height * $percent;
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
The above example will output something similar to:
The image will be output at half size, though better quality could be obtained using imagecopyresampled().
There is a problem due to palette image limitations (255+1 colors). Resampling or filtering an image commonly needs more colors than 255, a kind of approximation is used to calculate the new resampled pixel and its color. With a palette image we try to allocate a new color, if that failed, we choose the closest (in theory) computed color. This is not always the closest visual color. That may produce a weird result, like blank (or visually blank) images. To skip this problem, please use a truecolor image as a destination image, such as one created by imagecreatetruecolor().