## Simpler Method

- Computes difference of two color channels after scaling the image “contrast”
- Need to find scale factor that makes “parchment” and “overwriting” subtract to same gray value

## More Sophisticated Calculation

- Find combinations of the three images (R,G,B) that estimate the three classes of object.
- “Parchment”
- “Overwriting”
- “Underwriting”

- Same process used to “classify” images in environmental remote sensing

- Find combinations of the three images (R,G,B) that estimate the three classes of object.

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