PHP Manual: Copy and merge part of an image with gray scale

Description

bool imagecopymergegray(
    GdImage $dst_image,
    GdImage $src_image,
    int $dst_x,
    int $dst_y,
    int $src_x,
    int $src_y,
    int $src_width,
    int $src_height,
    int $pct
)

imagecopymergegray copy a part of src_image onto dst_image starting at the x,y coordinates src_x, src_y with a width of src_width and a height of src_height. The portion defined will be copied onto the x,y coordinates, dst_x and dst_y.

This function is identical to imagecopymerge except that when merging it preserves the hue of the source by converting the destination pixels to gray scale before the copy operation.

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.
src_width: Source width.
src_height: Source height.
pct: The src_image will be changed to grayscale according to pct where 0 is fully grayscale and 100 is unchanged. When pct = 100 this function behaves identically to imagecopy for pallete images, except for ignoring alpha components, while it implements alpha transparency for true colour images.

Return Values

Returns true on success or false on failure.

Changelog

Version	Description
8.0.0	`dst_image` and `src_image` expect GdImage instances now; previously, resources were expected.

Examples

Example #1 imagecopymergegray usage

<?php
// Create image instances
$dest = imagecreatefromgif('php.gif');
$src = imagecreatefromgif('php.gif');

// Copy and merge - Gray = 20%
imagecopymergegray($dest, $src, 10, 10, 0, 0, 100, 47, 20);

// Output and free from memory
header('Content-Type: image/gif');
imagegif($dest);

imagedestroy($dest);
imagedestroy($src);
?>