(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
imagecolorresolvealpha — Get the index of the specified color + alpha or its closest possible alternative
This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.
image
A GdImage object, 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.
Returns a color index.
Version | Description |
---|---|
8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
Example #1 Using imagecoloresolvealpha() to get colors from an image
<?php// Load an image$im = imagecreatefromgif('phplogo.gif');// Get closest colors from the image$colors = array();$colors[] = imagecolorresolvealpha($im, 255, 255, 255, 0);$colors[] = imagecolorresolvealpha($im, 0, 0, 200, 127);// Outputprint_r($colors);imagedestroy($im);?>
The above example will output something similar to:
Array ( [0] => 89 [1] => 85 )