Create imagecache preset programmatically in D6

If you need to create your own imagecache presets from code have a look at following example:

// Preset
  $imagecachepreset = imagecache_preset_save(array('presetname' => 'MYPRESETNAME'));
  // Action
  $imagecacheaction = new stdClass ();
  $imagecacheaction->presetid = $imagecachepreset['presetid'];
  $imagecacheaction->module = 'imagecache';
  $imagecacheaction->action = 'imagecache_scale_and_crop';
  $imagecacheaction->data = array('width' => '200', 'height' => '200' );
  drupal_write_record('imagecache_action', $imagecacheaction);

Thanks to Eikaa & mavimo for this

If you call this in your _install hook the preset gets installed when your module is enabled.
Now for uninstalling this imagecache preset in this case you can do the following:

imagecache_preset_delete(imagecache_preset_by_name('MYPRESETNAME'));
Thanks to tylerwaits for this