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(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.
imageEin GdImage-Objekt, das von einer der Funktionen zur Bilderzeugung, z. B. imagecreatetruecolor(), zurückgegeben wurde.
redWert der Rotkomponente.
greenWert der Grünkomponente.
blueWert der Blaukomponente.
alpha
A value between 0 and 127.
0 indicates completely opaque while
127 indicates completely transparent.
Returns a color index.
| Version | Beschreibung |
|---|---|
| 8.0.0 |
image erwartet nun eine
GdImage-Instanz; vorher wurde eine gültige
gd-Ressource erwartet.
|
Beispiel #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);
?>Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Array
(
[0] => 89
[1] => 85
)