Custom image sharpening
Using the imageapi and imagecache 5.x-2.0 it is fairly easy to integrate new image filters.
Firstly, ensure that you have a custom module that you can edit, or create a new one using the two files given below:
File: extra_filters.info
; $Id:
name = Image unsharp mask
description = Misc. custom filters; including unsharp mask, ...
package = Other
version = 0.1File: extra_filters.module
<?php
/**
* Implementation of hook_imagecache_actions.
*
* @return array
* An array of information on the actions implemented by a module. The array contains a
* sub-array for each action node type, with the machine-readable action name as the key.
* Each sub-array has up to 3 attributes. Possible attributes:
*
* "name": the human-readable name of the action. Required.
* "description": a brief description of the action. Required.
* "file": the name of the include file the action can be found
* in relative to the implementing module's path.
*/
function extra_filters_imagecache_actions() {
$actions = array(
'extra_filters_unsharp_mask' => array(
'name' => 'Unsharp mask',
'description' => 'Unsharp mask using amount, radius and threshold.',
// using external files to reduce the server load and clutter in the module
'file' => 'extra_filters_unsharp_mask.inc',
),
);
return $actions;
}
// don't add the ? > below to the real file
?>Then define up the form fields and filter:
Go to http://vikjavev.no/computing/ump.php to get a copy of the UnsharpMask function and paste it into the following file.
File: extra_filters_unsharp_mask.inc
<?php
/**
* Form to create the new filter parameters
*/
function extra_filters_unsharp_mask_form($action) {
$form['amount'] = array(
'#type' => 'textfield',
'#title' => t('Amount'),
'#default_value' => $action['amount'],
'#description' => t('Amount to sharpen: (typically 50 - 200)'),
);
$form['radius'] = array(
'#type' => 'textfield',
'#title' => t('Radius'),
'#default_value' => $action['radius'],
'#description' => t('Radius: (typically 0.5 - 1)'),
);
$form['threshold'] = array(
'#type' => 'textfield',
'#title' => t('Threshold'),
'#default_value' => $action['threshold'],
'#description' => t('Threshold: (typically 0 - 5)'),
);
return $form;
}
/**
* This lets the user see what parameters were selected for the action
*/
function theme_extra_filters_unsharp_mask($element) {
$data = $element['#value'];
return 'amount: '. $data['amount'] .', radius: '. $data['radius'] .', threshold: '. $data['threshold'];
}
/**
* Prep the filter
*/
function extra_filters_unsharp_mask_image(&$image, $data) {
$amount = $data['amount'] ? $data['amount'] : 100;
$radius = $data['radius'] ? $data['radius'] : 0.75;
$threshold = $data['threshold'] ? $data['threshold'] : 2.5;
$image->res = UnsharpMask($image->res, $amount, $radius, $threshold);
return true;
}
Paste the UnsharpMask function here.
// don't add the ? > below to the real file
?>Now, enable the new module via the admin interface, and the new filter should be listed alongside the core filters.
If you have any issues, use the forum topic http://drupal.org/node/281193 to discuss these.
Nice work
It is very nice work.
Unfortunately, I can't find the filter option any where(!)
Can you please help me out?
Beautifulmind
Know more
Same problem here
Cant see the new action in imagecache.