How to add special effects to images
Extreme Thumbnail Generator allows you to add some special effects to your images in the gallery. To open the special effects window select the image in the list and click the 
button or select menu item Images - Image effects....
Now you just have to choose the effect and change its default value. The preview of the selected image is immediately updated to reflect the newly applied effect.
Other options in this window allow you to apply the selected effect only to the thumbnail of the selected image or to all images in gallery. The Remove all effects button resets the default values for all effects.
See also
How to set the image quality for resized or modified images, How to resize images, How to add text to images