PHP 8.4.0 RC2 available for testing

Imagick::linearStretchImage

(PECL imagick 2, PECL imagick 3)

Imagick::linearStretchImageEstica com saturação a intensidade da imagem

Descrição

public Imagick::linearStretchImage(float $blackPoint, float $whitePoint): bool

Estica com saturação a intensidade da imagem.

Parâmetros

blackPoint

O ponto preto da imagem.

whitePoint

O ponto branco da imagem.

Valor Retornado

Retorna true em caso de sucesso.

Exemplos

Exemplo #1 Exemplo de Imagick::linearStretchImage()

<?php
function linearStretchImage($imagePath, $blackThreshold, $whiteThreshold) {
$imagick = new \Imagick(realpath($imagePath));
$pixels = $imagick->getImageWidth() * $imagick->getImageHeight();
$imagick->linearStretchImage($blackThreshold * $pixels, $whiteThreshold * $pixels);

header("Content-Type: image/jpg");
echo
$imagick->getImageBlob();
}

?>

add a note

User Contributed Notes 1 note

up
1
SkepticaLee
10 years ago
"Black" and "white" points here are pixel counts from the darkest and brightest ends respectively. To turn the darkest 90% of the pixels black, and the brightest 5% white, use the following:

<?php
$im
= new Imagick ("some image.png");
list (
$width, $height) = array_values ($im->getImageGeometry ());
$px = $width * $height;
$im->modulateImage (100, 0, 100);
$im->linearStretchImage ($px * 0.9, $px * 0.05);
$im->writeImage ("temp.jpg");
?>
To Top