I've got a satellite image world map (greyscale) which is set on and blended into a background landscape photo by simply lowering its opacity and feathering the edges.
The effect is really nice, but now I'd like to highlight a region of the map by increasing the opacity in that specific area.
Many thanks in advance for any advice on how to achieve this.
Nic
Use an opacity mask. You can use any number of objects in one as long as they're grouped. Thus:
The mask is made up of two objects: a light grey rectangle the same size as my photo, and a star in a darker grey. The tone of the shape determines the opacity of the mask. Group the two objects, then select the group and the image, then click 'Make Mask' in the Transparency panel.
If you want to edit the objects in the mask, click on the right-hand thumbnail. In your case if you want feathered edges you might use an inner glow effect:
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