PHP: Imagick::newImage

(PECL imagick 2, PECL imagick 3)

Imagick::newImage — Creates a new image

Bạn đang xem: newimage

Beschreibung

public Imagick::newImage(
    int $cols,
    int $rows,
    mixed $background,
    string $format = ?
): bool

Parameter-Liste

cols: Columns in the new image
rows: Rows in the new image
background: The background color used for this image
format: Image format. This parameter was added in Imagick version 2.0.1.

Rückgabewerte

Liefert true bei Erfolg.

Fehler/Exceptions

Wirft ImagickException bei Fehlern.

Changelog

Version	Beschreibung
PECL imagick 2.1.0	Now allows a string representing the color as the third parameter. Previous versions allow only an ImagickPixel object.

Beispiele

Beispiel #1 Using Imagick::newImage():

Create a new image and display it.

<?php

$image

= new Imagick();
$image->newImage(100, 100, new ImagickPixel('red'));
$image->setImageFormat('png');header('Content-type: image/png');
echo $image;?>

christian dot reinecke at trang web dot de ¶

Xem thêm: realme 3 pro

14 years ago

The color value (3rd argument) for transparency is "none".

jfalner1 at gmail dot com ¶

8 years ago

As it isn't obvious, the cols and rows arguments correspond to tát the width and height of the new image, expressed in pixels. Example #1 would generate a 100 px by 100 px image.

Eduard Sukharev ¶

7 years ago

It's not obvious and may be related only to tát some specific versions of ImageMagick (tested only for 6.7.7 and 6.8.9), but $cols and $rows must be a positive non-zero value.

<?php

$image

= new Imagick();
$image->newImage(0, 100, new ImagickPixel('red'));
$image->setImageFormat('png');file_put_contents('image.png', $image);
?>

In this case imagemagick will crash without throwing any exception and you'll get something along the lines (in your apache error log or console output):
    unable to tát acquire cache view `No such tệp tin or directory' @ fatal/cache-view.c/AcquireAuthenticCacheView/121.
Xem thêm: triumph
This might be the case when you calculate $cols and $rows (say, based on user input and predefined target image DPI):
<?php
$image 
= new Imagick();
$img->newImage($userInput->getWidth() * $defaultPpi, $userInput->getHeight() * $defaultPpi, new ImagickPixel('white'));
?>

In this case if user requested image with 0.006 width (in inches), the code would work for $defaultPpi = 300 ppi, but would crash for 
$defaultPpi = 72 ppi