I can't explain it as well as -k, but here's my less articulate version, hopefully this helps.
In the crystal report:
Create a formula named Print, put a 0 in the formula.
Select the image and right click, go to the format editor and click on the ->X-2 next to Suppress.
Enter the following: @Print = 1
In the application which is calling the report, where the print call is being made, set the variable Print := 1.