wp_imagecreatetruecolor( int $width, int $height )

Create new GD image resource with transparency support

Parameters

$width

(Required) Image width in pixels.

$height

(Required) Image height in pixels..

Return

(resource) The GD image resource.

Source

File: wp-includes/media.php 

function wp_imagecreatetruecolor($width, $height) {
	$img = imagecreatetruecolor($width, $height);
	if ( is_resource($img) && function_exists('imagealphablending') && function_exists('imagesavealpha') ) {
		imagealphablending($img, false);
		imagesavealpha($img, true);
	}
	return $img;
}

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Related

Changelog

Changelog
Version Description
WP-2.9.0 Introduced.