phpimagick完整安装
Imagick::blackThresholdImage is a method in PHP's Imagick extension that is used to perform black thresholding on an image. Black thresholding converts all pixels that are darker than a specified threshold value to black, while all remaining pixels are set to white.

Here is an example that demonstrates the usage of Imagick::blackThresholdImage:

php
// Create a new Imagick object
$image = new Imagick('path/to/image.jpg');

// Set the threshold value (0-65535, with 0 being black)
$threshold = 10000;

// Apply black thresholding
$image->blackThresholdImage($threshold);

// Save the modified image
$image->writeImage('path/to/output.jpg');


In the example above, the image.jpg file is loaded using the Imagick class. The blackThresholdImage method is then called on the image object, passing the threshold value of 10000 as the argument. Finally, the modified image is saved to the output.jpg file.

Please note that this method is specific to the Imagick extension in PHP and may not be available in other image processing libraries or software.