Preview Image Processing Changes
Changes to the images are not committed to disk until you click Process All. Once you click Process All, if the source and target images are on the same path (without filename change), would be overwritten and such change cannot be reverted.
Note : We strongly advice the use of the Preview One to determine if that is the changes you require before committing the changes to be made by the image processing engine. The appropriate measure would be to use a different Save In path so that the original files would be preserved.
In the program, on the Control Center page, the Preview One button allows you to preview the changes before they are made to the images.
First select the image to preview the changes and click, Preview One. 
All the image processing options are applied to the images with the exception of file name change and actual saving of the file. Do this as often as you like to ensure that the changes proposed are what you want.
Using this option does not degrade the image quality. Each time the Preview One button is press, the program would load the image fresh from file before applying the changes.