imagecolormatch
It seems that imagecolorresolve is adding the colors to the palette when it can't find them!
imagecolorresolve
(PHP 4, PHP 5)
imagecolorresolve — Get the index of the specified color or its closest possible alternative
Descrizione
int imagecolorresolve
( resource
$image
, int $red
, int $green
, int $blue
)This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.
Se l'immagine è stata creata da un file, solo i colori usati nell'immagine sono risolti. I colori presenti solo nella palette non sono risolti.
Elenco dei parametri
-
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.
Valori restituiti
Returns a color index.
Esempi
Example #1 Using imagecoloresolve() to get colors from an image
<?php
// Load an image
$im = imagecreatefromgif('phplogo.gif');
// Get closest colors from the image
$colors = array();
$colors[] = imagecolorresolve($im, 255, 255, 255);
$colors[] = imagecolorresolve($im, 0, 0, 200);
// Output
print_r($colors);
imagedestroy($im);
?>
Il precedente esempio visualizzerà qualcosa simile a:
Array
(
[0] => 89
[1] => 85
)
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User Contributed Notes
imagecolorresolve - [2 notes]
tom ¶
1 year ago
ceo at l-i-e dot com ¶
11 years ago
Okay, so sometimes it's really IMPORTANT to get the exact color you want, only it's not *IN* the Image, and ImageColorResolve just isn't "close enough".
The following code is a disgustingly gross hack, rather slow, but it does that.
$colorcount = array();
for ($x = 0; $x < $width; $x++){
for ($y = 0; $y < $height; $y++){
$colorindex = imagecolorat($jpg, $x, $y);
if (!isset($colorcount[$colorindex])){
$colorcount[$colorindex] = 1;
}
else{
$colorcount[$colorindex]++;
}
}
}
asort($colorcount);
reset($colorcount);
$black = imagecolorexact($jpg, 0, 0, 0);
if ($black == -1){
$goner = key($colorcount);
$rgb = imagecolorsforindex($jpg, $goner);
#error_log("Need black: About to kill $goner ($rgb[red], $rgb[green], $rgb[blue]) which was only used in $colorcount[$goner] pixels", 0);
unset($colorcount[$goner]);
imagecolordeallocate($jpg, $goner);
$black = imagecolorallocate($jpg, 0, 0, 0);
}
if ($black == -1){
$black = imagecolorresolve($jpg, 0, 0, 0);
#error_log("Damn! STILL couldn't allocate the color!", 0);
}