title: "Read" the graphics screen in assembly 13h mode
body: <p>Is there a way to "read" the 13h mode screen in Assembly (emu8086)?</p>
  
  <p>What I want to do is draw a shape in the 13h mode (in color A), then have the user try to trace it (in color B), effectively redrawing over the other pixels. Afterwards what i want to do is to "read" the screen to check how many pixels in color A are present. Assuming the user did a decent job tracing, there most be less A-color pixels than those of my original shape, through this metric i would score the user.</p>
  
  <p>Is there a way to check the screen for colored pixels, or do you propose another way of achieving the goal of "comparing" the traces.</p>
  
  <p>Thanks in advance.</p>