imagecopyresized

    (PHP 4, PHP 5, PHP 7, PHP 8)

    imagecopyresized — Copy and resize part of an image

    Description

    imagecopyresized(
        GdImage$dst_image,
        GdImage$src_image,
        int$dst_x,
        int$dst_y,
        int$src_x,
        int$src_y,
        int$dst_width,
        int$dst_height,
        int$src_width,
        int$src_height
    ): 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_width and height src_height at position (src_x,src_y) and place it in a rectangular area of dst_image of width dst_width and height dst_height at position (dst_x,dst_y).

    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.

    Parameters

    dst_image

    Destination image resource.

    src_image

    Source image resource.

    dst_x

    x-coordinate of destination point.

    dst_y

    y-coordinate of destination point.

    src_x

    x-coordinate of source point.

    src_y

    y-coordinate of source point.

    dst_width

    Destination width.

    dst_height

    Destination height.

    src_width

    Source width.

    src_height

    Source height.

    Return Values

    Returns true on success or false on failure.

    Changelog

    VersionDescription
    8.0.0dst_image and src_image expect GdImage instances now; previously, resources were expected.

    Examples

    Example #1 Resizing an image

    This example will display the image at half size.

    <?php
    // File and new size
    $filename = 'test.jpg';
    $percent = 0.5;

    // Content type
    header('Content-Type: image/jpeg');

    // Get new sizes
    list($width, $height) = getimagesize($filename);
    $newwidth = $width * $percent;
    $newheight = $height * $percent;

    // Load
    $thumb = imagecreatetruecolor($newwidth, $newheight);
    $source = imagecreatefromjpeg($filename);

    // Resize
    imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

    // Output
    imagejpeg($thumb);
    ?>

    The above example will output something similar to:

    Output of example : Resizing an image

    The image will be output at half size, though better quality could be obtained using imagecopyresampled().

    Notes

    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().

    See Also

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