Confining marquee opacity to area?

hi

I have a logo (in a layer with a drop shadow) and I want to add an 25% opacity marquee oval over the top half.

But I want to keep the background transparent and so don't want the marquee to show off the edges of the logo.

Anyone know how to do this?

cheers

You should be able to do this by creating a Clipping Mask.

1. Make sure the 'marquee' layer is directly above the 'logo' layer.
2. Hold down ALT (Option if you have a mac)
3. Position your cursor inside the Layers palette, right on the line between the names of the 'marquee' and 'logo' layers. You'll see the cursor change to two intersecting circles with a left-pointing arrow. When you see this cursor, click the mouse (still holding down ALT/Option. There you go, the 'marquee' layer is now clipped to the 'logo' layer.

If ever you need to 'un-clip' the layer, just do the same thing again with ALT/Option + click.