The Gmagick::setimagechanneldepth() function is an inbuilt function in PHP which is used to set the depth of a particular channel image.
Syntax:
Gmagick Gmagick::setimagechanneldepth( $channel , $depth )
Parameters: This function accepts two parameters as mentioned above and described below:
- $channel: This parameter is used to specify the channel constant. Below is the list of constant channel:
CHANNEL constants:- Gmagick::CHANNEL_UNDEFINED
- Gmagick::CHANNEL_RED
- Gmagick::CHANNEL_GRAY
- Gmagick::CHANNEL_CYAN
- Gmagick::CHANNEL_GREEN
- Gmagick::CHANNEL_MAGENTA
- Gmagick::CHANNEL_BLUE
- Gmagick::CHANNEL_YELLOW
- Gmagick::CHANNEL_ALPHA
- Gmagick::CHANNEL_OPACITY
- Gmagick::CHANNEL_MATTE
- Gmagick::CHANNEL_BLACK
- Gmagick::CHANNEL_INDEX
- Gmagick::CHANNEL_ALL
- Gmagick::CHANNEL_DEFAULT
- $depth: This parameter is used to specify the depth to be set for Gmagick object.
Return Value: This function returns the Gmagick object on success.
Below programs illustrate the Gmagick::setimagechanneldepth() function in PHP:
Program 1:
Original Image:
<?php    // Create new Gmagick object $im = new Gmagick(    // Using getImageChannelDepth function // with red channel echo "Before Set Channel depth: " . "</br>"; echo $im->getImageChannelDepth(Gmagick::CHANNEL_RED) . "</br>";    // Set channel Depth of CYAN and GREEN Channel $im->setimagechanneldepth(Gmagick::CHANNEL_RED, 4);    echo "After Set Channel depth: " . "</br>"; echo $im->getImageChannelDepth(Gmagick::CHANNEL_RED) . "</br>";   ?> |
Output:
Before Set Channel depth: 8 After Set Channel depth: 4
Program 2:
Original Image:
<?php    $string = "Computer Science portal for Geeks!";    // Creating new image of above String // and add color $im = new Gmagick(); $draw = new GmagickDraw();    // Fill the color in image $draw->setFillColor(new GmagickPixel('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 GmagickPixel('white'));    // Draw the image         $im->drawImage($draw); $im->setImageFormat('jpeg');    // Using getImageChannelDepth function // with red channel echo "Before Set Channel depth: " . "</br>"; echo $im->getImageChannelDepth(Gmagick::CHANNEL_GREEN) . "</br>";    // Set channel Depth of Green Channel $im->setimagechanneldepth(Gmagick::CHANNEL_GREEN, 8);    echo "After Set Channel depth: " . "</br>"; echo $im->getImageChannelDepth(Gmagick::CHANNEL_GREEN) . "</br>";   ?> |
Output:
Before Set Channel depth: 16 After Set Channel depth: 8
Reference: http://php.net/manual/en/gmagick.setimagechanneldepth.php
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