Kodak i780 Manual page 77

Blank Image Detection
4-16
Use the slider bar to select the image size before which an image is
determined to be blank. Images with sizes less than the size number
you select (ranges from 1 to 1000 KB) will not be created. If you use
this option, you must specify a blank image size for each image type
(Black and White, Grayscale and Color) you want to delete. The
default is none, which means you keep all images.
A-61504 October 2007