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imagecolortransparent
Define a color as transparent
(PHP 4, PHP 5)
int imagecolortransparent ( resource image [, int color] )
Parameters
- image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
- color
A color identifier created with imagecolorallocate()
Return Values
The identifier of the new (or current, if none is specified) transparent color is returned.
Notes
Note:
Transparency is copied only with imagecopymerge() and true color images, not with imagecopy() or pallete images.
Note:
The transparent color is a property of the image, transparency is not a property of the color. Once you have set a color to be the transparent color, any regions of the image in that color that were drawn previously will be transparent.