Postcard Tutorial
I'll be using this picture of the Great Wall of China.
Step 1
Select 1/4 of the picture to the right.
Then go to Menu Filter>>Color>>Gradient. Or just click the gradient button.

Settings:
Color 1 : White, Opacity 0%
Color 2 : Black, Opacity 70%
Direction Left To Right
Step 2
Hide the selection by clicking CTRL-D. Now go to Menu Filter>>Deform>>Trapezoid/Perspective
Settings:
Background : Black
Vertical axis,
Left Distort : 100%
Right Distort : 90%
Step 3
Duplicate the image by going to Image>>Duplicate. Select all and go to Edit>>Clear. Now hide the selection by clicking CTRL-D. You should now have another picture that is white. Now you can add text and do whatever to your picture.
Step 4
After the text is added, select 1/4 of the picture again and repeat the gradient step. But this time the direction is Right to Left. After the gradient is added, repeat the Trapezoid / Perspective step with the settings as:
Left Distort : 90%
Right Distort : 100%
Step 5
Now copy the picture with the text and now click the other picture. Go to Edit>>Paste Special>>Assemble. [screen shot]
Put the assemble clipboard data at right.
My Result







