Take the 2-minute tour ×  I have the following image:  enter
image description here  It is a shadow effect created in
Photoshop. I need to have that black shadow with transparent
background in order to be used with different background colors.
The problem is that the black shadow is "merged" with the blue
background.  How can I do that?   share|improve this question
Since it wouldn't take long time to do, I would definitely
remake that from scratch. –  Joonas Jun 8 '12 at 22:21  2
Answers 2  up vote 5 down vote accepted  Here's how I'd do that.
This assumes the shadow colour is black. If you want the
transparency to match perfectly, you may need to make some
adjustments near the end of this process (easy to do though).
1. Open the Channels panel.   2. Duplicate the green channel.
Dupe channel    1. Apply Levels to it, so that the highlight
point hits the right end of the graph data on the histogram.
2. Command-click the channel thumbnail to make a selection from
the channel.    3. Press shift-command-