[edit] Last updated: Fri, 25 May 2012

Imagick::setImageFormat

(PECL imagick 2.0.0)

Imagick::setImageFormat — 特定の画像のフォーマットを設定する

説明

bool Imagick::setImageFormat ( string $format )

シーケンス内の特定の画像のフォーマットを設定します。

パラメータ

format: 画像フォーマットを表す文字列。対応するフォーマットは、インストールされている ImageMagick に依存します。

返り値

成功した場合に TRUE を返します。

Imagick::setImageGamma

Imagick::setImageFilename

[edit] Last updated: Fri, 25 May 2012

add a note User Contributed Notes Imagick::setImageFormat

nathan at crause dot name 18-Aug-2010 03:35


For those of you completely confused by the utter lack of documentation for this class (including notes being dropped, probably this one included), the differences between any "setXXX" and "setImageXXX" seems to be entirely dependently on HOW the image was loaded.



If the image was loaded at object constructor time, it seems that you use "setXXX" - if you loaded it after the fact (such as via "readImageBlob") then you use "setImageXXX".



This is irregular, however. For example:



<?php

        $image = new Imagick();



        $image->setResolution(300, 300);

        $image->readImageBlob(...);

        // convert the output to JPEG

        $image->setImageFormat('jpeg');

        $image->setImageCompressionQuality(90);

?>



Note that we use "setResolution" not "setImageResolution".

andy at live dot nl 25-Feb-2009 11:54


I had a problem when using $im->setImageFormat('jpeg');


Image colors got inverted when i converted pdfs to jpg thumbs.


Had to add $im->setImageColorspace(255); to solve it.





<?php


// read page 1


$im = new imagick( 'test.pdf[ 0]' );





// convert to jpg


$im->setImageColorspace(255);


$im->setCompression(Imagick::COMPRESSION_JPEG);


$im->setCompressionQuality(60);


$im->setImageFormat('jpeg');





//resize


$im->resizeImage(290, 375, imagick::FILTER_LANCZOS, 1);  





//write image on server


$im->writeImage('thumb.jpg');


$im->clear();


$im->destroy();


?>

barclay[dot]loftus[at]gmail.com 12-Mar-2008 09:04


Another note about image output. For jpeg images, the quality is adjusted by Imagick::setCompressionQuality(). 



<?php

$img->setCompressionQuality(90);

$img->setImageFormat('jpeg');

header('Content-type: image/jpg');

echo $img;

?>

optymizer at yahoo dot com 21-Nov-2007 08:09


The previous example did not work for me. I received an error that the IMagick object cannot be converted to string.



This example uses the IMagick::getImageBlob() method to properly output the contents of the converted image:



function getImage($filename)

{

            $image->readImage($filename);

            $image->setImageFormat("png");

            header("Content-type: image/png");

            echo $image->getImageBlob();

}



Hope this helps!

Devo 07-Oct-2007 02:02


A list of formats can be found here: http://www.imagemagick.org/script/formats.php



Formats marked with a W can be output to file with writeImage (capabilities depend on your particular installation of course).



For example:



<?php

// create new imagick object from image.jpg

$im = new Imagick( "image.jpg" );



// change format to png

$im->setImageFormat( "png" );



// output the image to the browser as a png

header( "Content-Type: image/png" );

echo $im;



// or you could output the image to a file:

//$im->writeImage( "image.png" );

?>

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