Imagick::getImageChannelDepth()函數是PHP中的內置函數,用於獲取通道圖像的深度。
用法:
int Imagick::getImageChannelDepth( $channel )
參數:該函數接受單個參數$channel,該參數指定對通道模式有效的通道常數。頻道的默認值為Imagick::CHANNEL_DEFAULT。
返回值:成功時此函數返回True。
以下示例程序旨在說明PHP中的Imagick::getImageChannelDepth()函數:
程序1:
原始圖片:
<?php
// Create new imagick object
$im = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png');
// Using getImageChannelDepth function
// with different channel
echo $im->getImageChannelDepth(imagick::CHANNEL_RED) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_GRAY) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_CYAN) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_GREEN) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_BLUE) . "</br>";
?>
輸出:
8 8 8 8 8
程序2:
原始圖片:
<?php
$string = "Computer Science portal for Geeks!";
// Creating new image of above String
// and add color
$im = new Imagick();
$draw = new ImagickDraw();
// Fill the color in image
$draw->setFillColor(new ImagickPixel('green'));
// Set the text font size
$draw->setFontSize(50);
$metrix = $im->queryFontMetrics($draw, $string);
$draw->annotation(0, 40, $string);
$im->newImage($metrix['textWidth'], $metrix['textHeight'],
new ImagickPixel('white'));
// Draw the image
$im->drawImage($draw);
$im->setImageFormat('jpeg');
// Using getImageChannelDepth function
// with different channel
echo $im->getImageChannelDepth(imagick::CHANNEL_RED) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_GRAY) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_CYAN) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_GREEN) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_BLUE) . "</br>";
?>
輸出:
8 8 8 16 8
參考: http://php.net/manual/en/imagick.getimagechanneldepth.php
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注:本文由純淨天空篩選整理自R_Raj大神的英文原創作品 PHP | Imagick getImageChannelDepth() Function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。