Gradual transition of two pictures.

Hi,
I have two pictures, one on the left, and one on the right.  There is overlapping of the two pictures in the centre.  I want to have the overlapped area to transit from one pic to another gradually.  How can I achieve this?  I know layers and some basic operations of photoshop only.  If possible, please describe the procedures in details.
Thanks in advance.
nytAsked:
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nils pipenbrinckConnect With a Mentor Commented:
That's easy:

First you load the two images. Then you duplicate the layer of the second image into the first one.

You can also copy the image, switch to the other picture, create a new layer and paste into it.

If you have done this your Picture has two layers.. one for the first, and one for the second image.

Now you do the crossfade between the two:

You go into the masking mode.. That's the right button under the color-picker in the tools window. In this mode you don't draw any pixels anymore but you draw a selection.

Select the gradient tool and make a nice black to white gradient from the left to the right. Your Image will get a red tint in the places where the gradient becomes black. This is ok.

You now switch back from masking mode to normal mode (using the left button under the color-picler in the  tools window). You should now see a selection which selects either the left or the right half of the image.

Now you only have to press "del" to remove the selected parts. Since the  selection is equal to the gradient you've drawn it will remove more  of layer 1 where the gradient is darker..

That's the way to do crossfades.

btw: I usually also add some ripples and some noise to the gradient. This gives a nicer look.

Hope this helped,
  Nils
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nytAuthor Commented:
Thank you very much, it works perfect!
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