## Engauge Digitizer - Discretize Dialog

The Discretize dialog lets you adjust how the original image is processed. The processed image is used in Segment Fill and Point Match. To see the processed image, select the View/Processed Image menu option.

When the original image is processed, the Discretize settings determine which attribute of the picture will be used to determine if each pixel is 'on', or 'off'. The availabe attributes are:

- Intensity, similar to Value, refers to the degree of lightness or darkness.
- Foreground is defined as any part of the image that is not the background color. The background color is defined to be the color that appears most often in the original image.
- Hue is the color. It ranges from red, through various colors, and then back to red.
- Saturation refers to the degree of hue. Unsaturated colors are considered black, white and shades of gray.
- Value, similar to Intensity, refers to the degree of lightness or darkness.

Select an attribute. A histogram of the attribute values will appear in the histogram window. If necessary, click and drag the two tabs in that window to change the attribute range. Your changes will appear in the Preview window.

The Discretize settings that successfully clean up the pointplot.bmp example are shown below.