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    Imagick::getImageBlob

    (PECL imagick 2, PECL imagick 3)

    Imagick::getImageBlob — 画像シーケンスを blob で返す

    説明

    public Imagick::getImageBlob(): string

    画像フォーマットを直接記憶します。 これは、画像シーケンスを文字列で返します。 画像のフォーマットによって、返される blob の形式 (GIF, JPEG, PNG, など) が決まります。 別の画像フォーマットを返すには Imagick::SetImageFormat() を使用します。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    画像を含む文字列を返します。

    エラー / 例外

    エラー時に ImagickException をスローします。

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    User Contributed Notes 4 notes

    up
    7
    Vee W
    8 years ago
    For who want to show "animated" gif. This getImageBlob() will showing only one frame of image.
    Use getImagesBlob() instead.

    Example:

    <?php
    $Imagick     = new \Imagick($real_source_image_path_animated_gif);
    header("Content-Type: image/gif");
    echo     $Imagick->getImagesBlob();
    ?>
    up
    2
    jim at jimohalloran dot com
    3 years ago
    Further to Trevor's note above about getImageBlob potentially returning an empty string for large images.

    This seems image format dependent. I have a large (12046x8363) image which is returned ok. But if I call setImageFormat('pdf') and then call getImageBlob() again. Example:

    <?php
    // Image Manipulation here.
    $pngData = $imagick->getImageBlob(); // Returns a large PNG.
    $imagick->setImageFormat('pdf');
    $pdfData = $imagick->getImageBlob(); // Returns empty string immediately
    ?>
    up
    1
    Trevor
    13 years ago
    It seems that this method can return a zero-length string if faced with large-ish data. No exceptions are thrown.

    <?php
    $image     = new Imagick();
    if (!    $image->newImage(1000,1,'white')) throw new Exception();
    if (!    $image->scaleImage(0,200)) throw new Exception();
    print     "Image size: {$image->getImageWidth()},{$image->getImageHeight()}\n";
    if (!    $image->setImageFormat("jpeg")) throw new Exception();
    $a = $image->getImageBlob();
    print     "Rendered to ".strlen($a)." bytes\n";
    ?>

    Restrict your output image size, or ensure that the blob you get back isn't empty. (Note that IM seems to be doing the work, it delays for some time. But there's no indication of any error anywhere.)
    up
    1
    anonymous at internet dot domain
    8 months ago
    Function returns NULL without any error if ImageMagick policy.xml blocks handling the file format, i.e. PDF.
    For PDF output edit /etc/ImageMagick-6/policy.xml and remove the line which disables rights for PDF.
    If you use other functions, e.g. readImage() for PDF, ImageMagick nags about it and outputs the error message but this function fails silently.
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