Photoshop lens blur not working with depth map

[Ali Teshnizi]

I am trying to blur a picture gradually. As you see in the pictures I made a Gradient map, but at the end the lens blur effect does not work properly. Though there ist a different between the top and the buttom of the picure. But it is not like a real blur effect!

[Chuck Uebele · Accepted solution]

You've got the pattern on your image in the depthmap channel, which is throwing things off, bluring some items and not others at the top of the image. Rather than create a gradient layer, make a new channel and apply the gradient just to it for your depthmap.

[Ali Teshnizi]

I am quiet a beginner. So I did not understand what you mean. Could you explain a bit?

[davescm · Accepted solution]

Try setting your layers and channels  like this so the Alpha channel just contains greyscale gradient - nothing else

Dave

[Chuck Uebele]

As Dave mentioned. Just have your depth map channel as just the gradient. Look at your screen shot. You have the pattern of your main layers showing on the depth map. This is because you used a gradient with transparency. But you should just use the gradient tool directly on a new channel and not on a layer.