it allow slight to pass through it) and the contaminant causes the normally flat scanner lens glass surface to act more like a prism that scatter white light (like rain drops causing a rainbow). When scanning in colour mode the lines are different colours because the dirt/dust/sticky tape on the lamp/lens is often slightly transparent (i.e. Colour mode will often have different colour lines (red and blue seem to be quite common). Greyscale mode would have different shades of gray lines. Why are the lines on the images different colours? Well it depends whether you are scanning in B&W mode, greyscale mode or in colour mode. When you scan documents and you see a vertical line down the image that is not on the physical document, this is often caused by a contaminant like dirt or dust build up on the scanning lamp/lens assembly glass.Ĭustomer’s often call and say they have black lines, grey lines, or different coloured lines on their scanned images.
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