In the large preview screen that lets you see how the image will appear when you apply the selected filter, if you click within the image it will appear before the application of the filter and if you release the mouse button you’ll see how it looks. So you’ve just created a “before” and “after” filter, or maybe a ‘preview’ …

Filters are the Photoshop actions which help you alter the image of your choice. There are 13 categories of filters comprising of 110 filters, in other words changes in pictures and images can be done through 110 ways. Basic categories of these filters are “corrective” and “destructive”, described in more detail further on in this tutorial. As the names imply …