Case G-2Flippy and Hammy, two local party clowns, have been taking lots of digital photos during their recent gigs. They want to use the photos for promotion, both by posting them to their Web site and by creating some eye-catching ads and hand-outs. Most of their pictures have been taken against a solid black background. Flippy wants to make the pictures of Hammy really pop, and he decides to sharpen the edges using the ____.

A. Focus adjustment
B. Low Pass filter
C. Sharpen brush
D. High Pass filter

Answer: D