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function image_gd_desaturate in Drupal 7

Convert an image resource to grayscale.

Note that transparent GIFs loose transparency when desaturated.

Parameters

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

Return value

TRUE or FALSE, based on success.

See also

image_desaturate()

Related topics

Image toolkits
Functions for image file manipulations.

File

modules/system/image.gd.inc, line 233
GD2 toolkit for image manipulation within Drupal.

Code

function image_gd_desaturate(stdClass $image) {

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