Php/docs/function.imagecolorexactalpha

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imagecolorexactalpha

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

imagecolorexactalphaGet the index of the specified color + alpha


Description

imagecolorexactalpha ( resource $image , int $red , int $green , int $blue , int $alpha ) : int

Returns the index of the specified color+alpha in the palette of the image.


Parameters

image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
red
Value of red component.
green
Value of green component.
blue
Value of blue component.
alpha
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.

The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.

Return Values

Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.


Examples

Example #1 Get colors from the GD logo

<?php// Setup an image$im = imagecreatefrompng('./gdlogo.png');$colors   = Array();$colors[] = imagecolorexactalpha($im, 255, 0, 0, 0);$colors[] = imagecolorexactalpha($im, 0, 0, 0, 127);$colors[] = imagecolorexactalpha($im, 255, 255, 255, 55);$colors[] = imagecolorexactalpha($im, 100, 255, 52, 20);print_r($colors);// Free from memoryimagedestroy($im);?>

The above example will output something similar to:


Array
(
    [0] => 16711680
    [1] => 2130706432
    [2] => 939524095
    [3] => 342163252
)

See Also