(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
Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().
red
Valore della componente rossa.
green
Valore della componente verde.
blue
Valore della componente blu.
alpha
A value between 0
and 127
.
0
indicates completely opaque while
127
indicates completely transparent.
Returns a color index.
Versione | Descrizione |
---|---|
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);
// Output
print_r($colors);
imagedestroy($im);
?>
Il precedente esempio visualizzerà qualcosa simile a:
Array ( [0] => 89 [1] => 85 )