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Graphtec CSX300 large format scanner

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Scanning in Black and White

Scanning in black and white is what most CAD users will do most of the time.

Scanning Master software has two main settings for scanning in black and white: Intensity and Intensity Correction.

The Intensity setting is a simple threshold. Parts of an image darker than the intensity value are set to black (foreground), and parts of the image lighter than the intensity value are set to white (background).

The Intensity Correction setting is an adaptive threshold where the intensity setting is automatically altered in response to the drawing's local foreground / background darkness.

The Intensity Correction setting is useful if you have a drawing with faint or dirty areas. For example, we scanned the image below which has faint dashes and a dirty crease:

If this image is scanned using Scanning Master's default settings, the faint dashes are largely missed (Intensity = 115, Intensity Correction = 0):

If the Intensity setting is changed so that the faint dashes become visible, the crease is scanned as a thick, dirty line (Intensity = 74, Intensity Correction = 0):

However, changing the Intensity Correction setting allows the faint dashes to be scanned while keeping unwanted dirt caused by the crease to a minimum (Intensity = 115, Intensity Correction = 8):

The Intensity Correction setting is useful but to set it (or the Intensity setting) correctly you either need to either keep rescanning the drawing with different settings until you find the optimal one or you need to use the Rocker Mode. (Aaaargh!)

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