imagecopyresized() copies a rectangular
portion of one image to another image.
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.
Destination image link resource
Source image link resource
x-coordinate of destination point
y-coordinate of destination point
x-coordinate of source point
y-coordinate of source point
Example 1. Resizing an image
This example will display the image at half size.
The above example will output something similar to:
The image will be output at half size, though better quality could be obtained using imagecopyresampled().
Note: 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().