Imagick::newImage

    (PECL imagick 2, PECL imagick 3)

    Imagick::newImage — Creates a new image

    Descrizione

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

    Creates a new image and associates ImagickPixel value as background color

    Elenco dei parametri

    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.

    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 Now allows a string representing the color as the third parameter. Previous versions allow only an ImagickPixel object.

    Esempi

    Example #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;

    ?>

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    User Contributed Notes 3 notes

    up
    44
    christian dot reinecke at web dot de
    15 years ago
    The color value (3rd argument) for transparency is "none".
    up
    5
    jfalner1 at gmail dot com
    9 years ago
    As it isn't obvious, the cols and rows arguments correspond to the width and height of the new image, expressed in pixels. Example #1 would generate a 100 pixel by 100 pixel image.
    up
    1
    Eduard Sukharev
    8 years ago
    It's not obvious and may be related only to 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 acquire cache view `No such file or directory' @ fatal/cache-view.c/AcquireAuthenticCacheView/121.

    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
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