PHP. Учебник. 2005

Description

int imagecolortransparent ( resource image [, int color] )

- imagecolortransparent() sets the transparent color in the image image to color. image is the image identifier returned by imagecreatetruecolor() and color is a color identifier returned by imagecolorallocate().

Замечание: 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.

- The identifier of the new (or current, if none is specified) transparent color is returned.

Замечание: Transparency is copied only with imagecopymerge() and true color images, not with imagecopy() or pallete images.