PHP 4, PHP 5, PHP 7, PHP 8
imagecolortransparent - Define a color as transparent
Code Examples

imagecolortransparent( GdImage$image, [int|null$color = null] ): int

Gets or sets the transparent color in the given image.



A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.


A color identifier created with imagecolorallocate.

Return Values

The identifier of the new (or current, if none is specified) transparent color is returned. If color is null, and the image has no transparent color, the returned identifier will be -1.



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


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.


Version Description
8.0.0 image expects a GdImage instance now; previously, a resource was expected.
8.0.0 color is now nullable.

Example of imagecolortransparent

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Function imagecolortransparent:

Image Processing and GD Functions

Most used PHP functions