Please explain the Clip Noise function?
When a document is scanned, each color on the original document is normally captured as several shades of that color. This is due to both noise and lighting variations picked up by the scanning system. This becomes particularly important for black and white as these colors most often represent the background. In order to correct this problem two commands have been provided, Color – Clip Noise – Lower and Color – Clip Noise – Upper. When either of these commands are selected, a palette is offered that contains the layers palette sorted on average intensity. If clipping the lower end of the palette, the title of the dialog will be ‘Select highest to clip’ and when clipping the upper end the title will be ‘Select lowest to clip’. When you ‘Select highest to clip’ then all entries in the palette below and including the selected entry will be modified to be black. The ‘Select lowest to clip’ will modify every entry above and including the selected entry to white.
