Imagick::setImageFormat

(PECL imagick 2.0.0)

Imagick::setImageFormatSets the format of a particular image

Descrizione

bool Imagick::setImageFormat ( string $format )

Sets the format of a particular image in a sequence.

Elenco dei parametri

format

String presentation of the image format. Format support depends on the ImageMagick installation.

Valori restituiti

Restituisce TRUE in caso di successo.

add a note add a note

User Contributed Notes 7 notes

up
3
nathan at crause dot name
4 years ago
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".
up
1
markus dot s dot schmitz at gmail dot com
1 year ago
If you use writeFile or writeFiles without setting the format, it is automatically set according to the file extension used within the parameter of writeFile.
up
1
Devo
7 years ago
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" );
?>
up
0
layzee dot dk at gmail dot com
1 year ago
This method only affects the individual loaded/constructed images.

To set the format of the entire object, use the Imagick::setFormat method. E.g. load TIFF files, then use setFormat('pdf') on the Imagick object, then writeImagesFile('foo.pdf') or getImagesBlob().
up
0
andy at live dot nl
5 years ago
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();
?>
up
0
barclay[dot]loftus[at]gmail.com
6 years ago
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;
?>
up
0
optymizer at yahoo dot com
6 years ago
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!
To Top