ImagickKernel::addUnityKernel

(PECL imagick >= 3.3.0)

ImagickKernel::addUnityKernel — Adds a Unity Kernel to the kernel list

Descrição

public ImagickKernel::addUnityKernel(float $scale): void

Adds a given amount of the 'Unity' Convolution Kernel to the given pre-scaled and normalized Kernel. This in effect adds that amount of the original image into the resulting convolution kernel. The resulting effect is to convert the defined kernels into blended soft-blurs, unsharp kernels or into sharpening kernels.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

Exemplos

Exemplo #1 ImagickKernel::addUnityKernel()

<?php



    function renderKernelTable($matrix) {
        $output = "<table class='infoTable'>";
    
        foreach ($matrix as $row) {
            $output .= "<tr>";
            foreach ($row as $cell) {
                $output .= "<td style='text-align:left'>";
                if ($cell === false) {
                    $output .= "false";
                }
                else {
                    $output .= round($cell, 3);
                }
                $output .= "</td>";
            }
            $output .= "</tr>";
        }
    
        $output .= "</table>";
    
        return $output;
    }

    $matrix = [
        [-1, 0, -1],
        [ 0, 4,  0],
        [-1, 0, -1],
    ];

    $kernel = \ImagickKernel::fromMatrix($matrix);
    $kernel->scale(1, \Imagick::NORMALIZE_KERNEL_VALUE);
    $output = "Before adding unity kernel: <br/>";
    $output .= renderKernelTable($kernel->getMatrix());
    $kernel->addUnityKernel(0.5);
    $output .= "After adding unity kernel: <br/>";
    $output .= renderKernelTable($kernel->getMatrix());
    
    
    $kernel->scale(1, \Imagick::NORMALIZE_KERNEL_VALUE);
    $output .= "After renormalizing kernel: <br/>";
    $output .= renderKernelTable($kernel->getMatrix());

    echo $output;

?>

Exemplo #2 ImagickKernel::addUnityKernel()

<?php
function addUnityKernel($imagePath) {

    $matrix = [
        [-1, 0, -1],
        [ 0, 4,  0],
        [-1, 0, -1],
    ];

    $kernel = ImagickKernel::fromMatrix($matrix);

    $kernel->scale(4, \Imagick::NORMALIZE_KERNEL_VALUE);
    $kernel->addUnityKernel(0.5);


    $imagick = new \Imagick(realpath($imagePath));
    $imagick->filter($kernel);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();

}

?>

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