A PCX image file
A 324x330 PCX image file is loaded into a bitmap in memory.
Onscreen window is created of sufficient size to contain two copies of the image, one above the other. (See Figure 1.)
Original image is copied into the upper half of the onscreen window.
All pixels in the memory bitmap are negated.
Modified bitmap is copied to bottom of onscreen window
Pressing any key causes the program to terminate.
Figure 1. Screen output from program named ImageNegate01.