RESOLVED - Does Imagick Support Radial Gradients ?

[nkline]

Hi,

PROBLEM
When using Imagick::newPseudoImage to create a radial gradient, this error appears in the Apache HTTP error log and the radial gradient is not created:

PHP Fatal error: Uncaught exception 'ImagickException' with message 'Unable to create new pseudo image: radial-gradient:#FF0000-#FFFFFF' in /var/www/html/energy/scripts/rg.php:6\nStack trace:\n#0 /var/www/html/energy/scripts/rg.php(6): Imagick->newpseudoimage(150,150, 'radial-gradient...')\n#1 {main}\n thrown in /var/www/html/energy/scripts/rg.php on line 6


RESEARCH
The documentation at http://us.php.net/manual/en/function.im ... oimage.php is lacking but according to http://www.imagemagick.org/script/formats.php (search for "radial"):

RADIAL_GRADIENT...Gradual radial passing from one shade to another...Returns a rendered radial gradient image using the specified image size. Specify the desired shading as part of the filename (e.g. radial-gradient:red-blue or radial-gradient:#F00-#00F).

I've tried using "RADIAL_GRADIENT" instead of "radial-gradient" and every other combination I could think of. Utimately, I would like to feed Imagick::newPseudoImage RGB values instead of hex and save the created images to disk.


My PHP script

Code: Select all

<?php
      // Create a new imagick object.
      $image = new Imagick();

      // A new image with radial gradient fading from red to white, 150 by 150 pixels.
      $image->newPseudoImage(150,150,'radial-gradient:#FF0000-#FFFFFF');

      // Set the image format to PNG.
      $image->setImageFormat('png');

      // Output the image.
      header("Content-Type: image/png");
      echo $image;
?>

My Environment
imagick 3.0.1RC1
ImageMagick 6.2.8.0
PHP 5.2.14
RedHat Enterprise Linux 5.5


Thank you!

[el_supremo]

Instead of newpseudoimage try this:

Code: Select all

$image->setSize(150,150);
$image->readImage('radial-gradient:#FF0000-#FFFFFF');

Pete

[nkline]

Thank you for the code suggestion and quick reply. Unfortunately, a fatal error is still produced:

PHP Script

Code: Select all

<?php
        // Create a new imagick object.
        $image = new Imagick();

        // An alternative to newPseudoImage.
        $image->setSize(150,150);
        $image->readImage('radial-gradient:#FF0000-#FFFFFF');

        // Set the image format to PNG.
        $image->setImageFormat('png');

        // Output the image.
        header("Content-Type: image/png");
        echo $image;
?>

Apache HTTP error_log

PHP Fatal error: Uncaught exception 'ImagickException' with message 'Unable to read the file: radial-gradient:#FF0000-#FFFFFF' in /var/www/html/energy/scripts/rg.php:10\nStack trace:\n#0 /var/www/html/energy/scripts/rg.php(10): Imagick->readimage('radial-gradient...')\n#1 {main}\n thrown in /var/www/html/energy/scripts/rg.php on line 10

Unsure if this is related

(process:6353): libgnomevfs-WARNING **: Unable to create ~/.gnome2 directory: Permission denied

I'm open to other recommendations. Maybe try upgrading ImageMagick (installed version = ImageMagick 6.2.8.0).

Thanks

[el_supremo]

Radial gradients were added in version 6.4.4-1 so you need to upgrade your version.

Pete

[DJ Mike]

That was new to me. Here is how it works:

Code: Select all

<?php
/* new imagick object */
$image = new Imagick();
/* a new pseudoimage with gradient */
$image->newPseudoImage( 100, 100, "radial-gradient:red-blue" );
/* set the image format to png */
$image->setImageFormat("png");
/* output to browser */
header( "Content-Type: image/png" );
echo $image;
?> 

And here is what it looks like


Imagick::newPseudoImage
http://eclecticdjs.com/mike/tutorials/p ... php#radial