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1. drupal
   1. drupal7

Convert an image resource to grayscale.

Note that transparent GIFs loose transparency when desaturated.

see image_desaturate()

Übergabeparameter

$image An image object. The $image->resource value will be modified by this call.

Rückgabewert

TRUE or FALSE, based on success.

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Code

modules/system/image.gd.inc, line 216

<?php
function image_gd_desaturate(stdClass $image) {
  // PHP installations using non-bundled GD do not have imagefilter.
  if (!drupal_function_exists('imagefilter')) {
    watchdog('image', 'The image %file could not be rotated because the imagefilter() function is not available in this PHP installation.', array('%file' => $image->source));
    return FALSE;
  }

  return imagefilter($image->resource, IMG_FILTER_GRAYSCALE);
}
?>