function color2hex($color)
{
$hsv[0] = ($color >> 16) / 360;
$hsv[1] = ($color >> 8 & 255) / 255;
$hsv[2] = ($color & 255) / 255;
return rgb2hex(hsv2rgb($hsv));
}
public function apply($resource)
{
// Extract arguments
@(list(, $h, $s, $v, $a) = func_get_args());
$h = (int) $h;
$s = (int) $s;
$v = (int) $v;
$a = (int) $a;
// Convert
list($r, $g, $b) = hsv2rgb($h, $s, $v);
// Normalize
if ($a < 0) {
$a = 0;
} elseif ($a > 100) {
$a = 100;
}
if ($v < 0) {
$v = 0;
} elseif ($v > 100) {
$v = 100;
}
$a = (100 - $a) * 1.27;
$v = ($v * 2 - 100) * 2.55;
// Compute hue ratio
$delta = $r + $g + $b;
if ($delta != 0) {
$ratio1 = $r / $delta;
$ratio2 = $g / $delta;
$ratio3 = $b / $delta;
}
// récupération de la résolution
$width = imagesx($resource);
$height = imagesy($resource);
if (!$width || !$height) {
throw new Exception("An error was encountered while getting image resolution");
}
// Apply effect
$x = 0;
do {
$y = 0;
do {
// Get current pixel color
list($r, $g, $b) = $this->_getColorAt($resource, $x, $y);
// Define new color
$new_r = $r * $ratio1 + $g * $ratio2 + $b * $ratio3 + $v;
$new_g = $r * $ratio3 + $g * $ratio1 + $b * $ratio2 + $v;
$new_b = $r * $ratio2 + $g * $ratio3 + $b * $ratio1 + $v;
// Format
if ($new_r < 0) {
$new_r = 0;
} elseif ($new_r > 255) {
$new_r = 255;
}
if ($new_g < 0) {
$new_g = 0;
} elseif ($new_g > 255) {
$new_g = 255;
}
if ($new_b < 0) {
$new_b = 0;
} elseif ($new_b > 255) {
$new_b = 255;
}
// Define pixel
imagesetpixel($resource, $x, $y, imagecolorallocatealpha($resource, $new_r, $new_g, $new_b, $a));
} while (++$y < $height);
} while (++$x < $width);
return $resource;
}
function aimacolorallocate_hsv($im, $H, $S, $V)
{
$rgb = hsv2rgb($H, $S, $V);
return aimacolorallocate($im, $rgb[0], $rgb[1], $rgb[2]);
}
