bitmap algebraic menu

This menu is for performing boolean algebraic operations with bitmaps. It is very similar to the black & white algebraic menu, except that the operations are boolean rather than numeric. The menu works as follows:

You specify a bitmap image name in the Image A menu field, then click on the READ IMAGE A menu field. The system will read that bitmap image into memory.
You do the same for another bitmap as Image B.
You can now OR, AND, or XOR the two bitmaps to produce Image C. You can display any of the bitmaps at any time, and you can move them around by clicking on the A=>B, A=>C, B=>C, C=>A, C=>B, C=>D, or D=>C menu fields.

You can continue any of these manipulations as long as you want, and you can introduce new bitmaps at any time by entering their names and clicking on READ IMAGE A or READ IMAGE B. When you want to save a result, first move it to Image A, and then click on:

OVERWRITE BITMAP A, if you want to save it over what bitmap A originally had,
SAVE NEW BITMAP A, to create a new bitmap image with the same name as bitmap A, or
SAVE UNDER NEW NAME, to create a new bitmap using the name specified in the New name menu field.

You can restrict the boolean operation to work on only a portion of the image by specifying an Area of Interest (AOI). The AOI can be either rectangular or polygonal. To specify a rectangular AOI, first display the image, then click on USE RECTANGULAR AREA. The system will prompt you to indicate the rectangular area on the image. Do so with two clicks. When you then initiate the boolean operation, only the pixels in the rectangular area will be affected. Similarly, you can make an irregular AOI by first clicking on USE POLYGONAL AREA and then outlining the AOI with a series of clicks on mouse button 1. Terminate the drawing of the AOI by clicking with button 2. If you have restricted processing to an AOI and you want to make it apply to the entire image again, click on USE ENTIRE IMAGE.