Changing the Surface and Size settings such as Threshold after imaging in the software provides the operator or user with the ability to detect the main pseudo target sources in the situation that the color stain or pseudo target VDI number determined in the pre imaging settings in the original circuit and the software It will be revealed after imaging  but this color stain or VDI number is not related to the main target  but it is similar to the color stain or VDI number of the desired target in this situation after imaging by changing the Surface and Size Threshold settings The color stain or VDI number of pseudo main target is revealed and it is determined that the revealed color stain or VDI number is not related to the main target and one of the applications of Surface and Size settings such as Threshold in the main circuit and the software that finds the Image Scanner or Metal Detector Image Scanner or GPR or Ground Penetrating Radar or Manual Ground Radar scanner or Ground Handy Radar Scanner  are related to each other  the separation of stain colors and VDI number belongs to the main sources targets and quasi target fields