Imagick::scaleImage

(PECL imagick 2, PECL imagick 3)

Imagick::scaleImage — Scales the size of an image

Descrizione

public Imagick::scaleImage(
    int $columns,
    int $rows,
    bool $bestfit = false,
    bool $legacy = false
): bool

Scales the size of an image to the given dimensions. The other parameter will be calculated if 0 is passed as either param.

Nota: The behavior of the parameter bestfit changed in Imagick 3.0.0. Before this version given dimensions 400x400 an image of dimensions 200x150 would be left untouched. In Imagick 3.0.0 and later the image would be scaled up to size 400x300 as this is the "best fit" for the given dimensions. If bestfit parameter is used both width and height must be given.

Elenco dei parametri

columns
rows
bestfit

Valori restituiti

Restituisce true in caso di successo.

Errori/Eccezioni

Lancia una ImagickException in caso di errore.

Log delle modifiche

Versione	Descrizione
PECL imagick 2.1.0	Added optional fit parameter. This method now supports proportional scaling. Pass zero as either parameter for proportional scaling.

Esempi

Example #1 Imagick::scaleImage()

<?php
function scaleImage($imagePath) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->scaleImage(150, 150, true);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}

?>

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User Contributed Notes 6 notes

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benford at bluhelix dot com ¶

15 years ago


If anyone finds "The other parameter will be calculated if 0 is passed as either param. " to be a bit confusing, it means approximately this:

<?php
$im = new Imagick('example.jpg');
$im->scaleImage(300, 0);
?>

This scales the image such that it is now 300 pixels wide, and automatically calculates the height to keep the image at the same aspect ratio.

<?php
$im = new Imagick('example.jpg');
$im->scaleImage(0, 300);
?>

Similarly, this example scales the image to make it 300 pixels tall, and the method automatically recalculates the image's height to maintain the aspect ratio.

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vincent dot hoen at gmail dot com ¶

17 years ago


Here is an easy way to resize an animated gif : 

$picture = new Imagick('animated_gif.gif');

foreach($picture as $frame){
    $frame->scaleImage($width, $height);
}

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octave at web dot de ¶

15 years ago


When using the "fit = true" option, the image will only scale down, but never scale up:

<?php
$im = new Imagick('1600x1200.jpg');

$im->scaleImage(2000, 1500, true); // => 1600x1200

$im->scaleImage(1000, 500, true); // => 666x500
?>

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agamemnus at flyingsoft dot pw ¶

10 years ago


Warning: this will blur your edges in possibly unexpected ways. For better control, use resizeImage, instead.

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clickconvert at gmail dot com ¶

12 years ago


Need to resize portrait and landscape images (and convert to 72ppi)? These will fit an area of 800x600 without distorting, no matter how tall or wide.



<?php

    $img = new Imagick($img_loc.$file);

    $img->setImageResolution(72,72); 

    $img->resampleImage(72,72,imagick::FILTER_UNDEFINED,1);

    $img->scaleImage(800,0);

    $d = $img->getImageGeometry(); 

    $h = $d['height']; 

    if($h > 600) {

    $img->scaleImage(0,600);

    $img->writeImage($resized_loc.$file);

    } else {

    $img->writeImage($resized_loc.$file);

    }

    $img->destroy();

?>

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-5

peter at icb dot at ¶

15 years ago


If using the fit-parameter this function sometimes seems not to work when one of the two sizes (width or height) is the same size as the image has. For example:

<?php
$image = new Imagick('800x480.jpg');
$image->scaleImage(640, 480, true);

// $image is still 800x480
?>

You have to calculate the new sizes yourself and use false for $fit in this case.

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