Add To Menu Button; Cancel Button; Ok Button - Microtek ArtixScan 4500t Reference Manual

Add to Menu button

This button takes note of the settings you have performed, then adds it as a
selection to the Custom pull-down menu in the Settings window.
When you click this button, a dialog box comes up, and you can enter the name
of the new custom setting to be added. For instance, the added setting can be
called "Custom 1". This way, you can retrieve and load the setting in the future.

Cancel button

This button cancels out all image-enhancement changes you have made to the
current scan job, and then closes the AIC dialog box.
Example: If you applied filters, changed the curve, and then clicked Cancel, none
of the changes will take effect, and you exit the AIC dialog box.

OK button

This button applies to the current scan job whatever image enhancements you
have performed, and then closes the AIC dialog box.
Example: If you increased saturation, changed the gradation curve, and then
clicked OK, all the changes are applied, and you exit the AIC dialog box.
Reference: The Advanced Image Correction Tools 81