This is a montage of approximately 250 small images in ID CS5. Each photo is a separate object. I would like to knock out the shape of the dog in silhouette to reveal the background layer, which is underneath the small images and can't be seen in this picture. Then I would like to add a drop shadow to give the background layer some depth.
I know how to do this with either text or a shape created in InDesign, but I'm having trouble getting it to work for a placed object. I've tried using the silhouette as an EPS, AI and PSD but can't figure it out.
Draw a large frame to cover the page. Place the dog over that and use the
pathfinder panel to cut the dog out of the frame. Now group the little
images and cut them to the clipboard. Paste into the frame with the cutout.
You may want to use either the PSD version and create a clipping path, then convert the path to a frame so you can use the pathfinder, or paste the shape, rather than placing, from Illustrator.