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Image processing (3)

Grotty results of hard-substratum map scanning with a $8.000 scanner set us thinking about use of inexpensive office equipment.

Mask filtering is a powerful tool for processing black and white raster. Proper use of mask filters can solve a huge range of tasks, from preparing a raster terrain contour lines to highlight the marshes.

Source data are seldom represented by snow-white paper with black lines. Rather low-grade initially, they become even worse because of long storage. In short, it is usually impossible to get a binary (black-and-white) raster file without loss of information at scanning.