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Imagick::getPixelIterator

(PECL imagick 2.0.0)

Imagick::getPixelIteratorReturns a MagickPixelIterator

Descrierea

ImagickPixelIterator Imagick::getPixelIterator ( void )

Returns a MagickPixelIterator.

Valorile întoarse

Returns an ImagickPixelIterator on success.

Erori/Excepții

Emite ImagickException în caz de eroare.

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Sebastian Herold
6 years ago
For me it was very helpful to read a article at Mikko's blog. He showed that the PixelIterator is not read-only, if you sync it regularly:

<?php
     
/* Create new object with the image */
     
$im = new Imagick( "strawberry.png" );

     
/* Get iterator */
     
$it = $im->getPixelIterator();
      
     
/* Loop trough pixel rows */
     
foreach( $it as $row => $pixels )
      {
         
/* For every second row */
         
if ( $row % 2 )
          {
             
/* Loop trough the pixels in the row (columns) */
             
foreach ( $pixels as $column => $pixel )
              {
                     
/* Paint every second pixel black*/
                     
if ( $column % 2 )
                      {
                             
$pixel->setColor( "black" );
                      }
              }

          }
        
         
/* Sync the iterator, this is important to do on each iteration */
         
$it->syncIterator();
      }
      
     
/* Display the image */
     
header( "Content-Type: image/png" );
      echo
$im;
      
?>
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