Hydrogen Alpha

Click on a thumbnail to view a larger version.

Images should be viewed at 1024 x 768 monitor resolution.

Adjust the brightness and contrast of your monitor so that you can view each of the 17 grayscale steps from
black to white. Special attention should be given to the black end of the scale. The darkest step should be
made as dark as possible while you are also able to distinguish it from the next lighter step.