(PECL imagick 2, PECL imagick 3)
Imagick::getImageBlob — Görüntü dizisini ikil dizge olarak döndürür
Görüntüyü bellekteki biçemiyle ikil dizge olarak döndürür. Görüntünün biçemi dönen dizgenin dosya biçemine bağlıdır (GIF, JPEG, PNG, vb.). Görüntü biçemini değiştirmek için Imagick::setImageFormat() yöntemini kullanın.
Bu işlevin bağımsız değişkeni yoktur.
Görüntüyü içeren bir ikil dizge döner.
Hata durumunda bir ImagickException istisnası oluşur.
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();
?>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
?>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.)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.