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

Description

bool imagecopymergegray ( resource $dst_im , resource $src_im , int $dst_x , int $dst_y , int $src_x , int $src_y , int $src_w , int $src_h , int $pct )

imagecopymergegray() copy a part of src_im onto dst_im starting at the x,y coordinates src_x , src_y with a width of src_w and a height of src_h . 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_im: Destination image link resource
src_im: Source image link 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_w: Source width
src_h: Source height
pct: The two images will be merged according to pct which can range from 0 to 100. When pct = 0, no action is taken, when 100 this function behaves identically to imagecopy() for pallete images, while it implements alpha transparency for true colour images.

Return Values

Returns TRUE on success or FALSE on failure.