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Imagick::getImageBlob

(PECL imagick 2, PECL imagick 3)

Imagick::getImageBlobDevuelve la secuencia de imágenes como un valor de tipo blob

Descripción

Imagick::getImageBlob(): string

Implementa, directo a la memoria, formatos de imagen. Devuelve la secuencia de imágenes como una cadena. El formato de la imagen determina el formato del blob devuelto (GIF, JPEG, PNG, etc.). Para devolver un formato de imagen diferente use Imagick::setImageFormat().

Valores devueltos

Devuelve una cadena que contiene la imagen.

Errores/Excepciones

Lanza ImagickException en caso de error.

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User Contributed Notes 3 notes

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7
Vee W
7 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();
?>
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2
jim at jimohalloran dot com
2 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
?>
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1
Trevor
12 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.)
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