本文整理匯總了PHP中phpthumb_functions::GrayscalePixel方法的典型用法代碼示例。如果您正苦於以下問題：PHP phpthumb_functions::GrayscalePixel方法的具體用法？PHP phpthumb_functions::GrayscalePixel怎麽用？PHP phpthumb_functions::GrayscalePixel使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類phpthumb_functions的用法示例。
在下文中一共展示了phpthumb_functions::GrayscalePixel方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的PHP代碼示例。
示例1: Threshold
public function Threshold(&$gdimg, $cutoff)
{
$width = ImageSX($gdimg);
$height = ImageSY($gdimg);
$cutoff = min(255, max(0, $cutoff ? $cutoff : 128));
for ($x = 0; $x < $width; $x++) {
for ($y = 0; $y < $height; $y++) {
$currentPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
$grayPixel = phpthumb_functions::GrayscalePixel($currentPixel);
if ($grayPixel['red'] < $cutoff) {
$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, 0x0, 0x0, 0x0, $currentPixel['alpha']);
} else {
$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, 0xff, 0xff, 0xff, $currentPixel['alpha']);
}
ImageSetPixel($gdimg, $x, $y, $newColor);
}
}
return true;
}