imagecreatetruecolor
(PHP 4 >= 4.0.6, PHP 5)
imagecreatetruecolor -- Create a new true color image
Description
resource
imagecreatetruecolor ( int width, int height )
imagecreatetruecolor() returns an image identifier
representing a black image of the specified size.
Depending on your PHP and GD versions this function is defined or not. With
PHP 4.0.6 through 4.1.x this function always exists if the GD module is
loaded, but calling it without GD2 being installed PHP will issue a fatal
error and exit. With PHP 4.2.x this behaviour is different in issuing a
warning instead of an error. Other versions only define this function, if
the correct GD version is installed.
Parameters
width
Image width
height
Image height
Return Values
Returns an image resource identifier on success, FALSE on errors.
Examples
Example 1.
Creating a new GD image stream and outputting an image.
<?php
header ("Content-type: image/png");
$im = @imagecreatetruecolor(120, 20)
or die("Cannot Initialize new GD image stream");
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 1, 5, 5, "A Simple Text String", $text_color);
imagepng($im);
imagedestroy($im);
?>
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The above example will output
something similar to: 
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Notes
Note: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).
Note:
This function will not work with GIF file formats.