In this final part (phew~) you'll learn how to enhance nightshots using similar techniques. Only one image is required, although you can have more of them and stack them on top of each other.
Step 1 - Load Images
Step 2 - You'll Get This
Step 3 - Create Layer From Background
Right click on the locked background layer and select Layer From Background… a mobile layer will be created.
Step 4 - Duplicate Layer
Select the layer and right click on it. Select Duplicate Layer… to create a copy of the same layer.
Step 5 - Change the Blending Options
Select the new layer, most probably named Layer 0 Copy, and change it's Blending Mode to Screen.
Step 6 - Duplicate the New Layer
Select the Layer 0 Copy, right click it and then select Duplicated Layer… to create new copies of the layer with their blending options already set to Screen. This saves you the effort to changing the blending mode of each layers individually. The reason why the bottommost layer's blending option is not set to screen because it doesn't matter. Only the layers above it needed to be changed to screen. Duplicate the layers until you've seen the desired result. For me, I've duplicated the new layer 3 times, so I have 4 layers in total. Can you see that the brightness of the image is enhanced? Here is the final image with some touch ups done (to remove noise):
And here is the demo file for the last part (13.71mb):
Hope you all find this tutorial useful! 
All kind of comments are welcomed! Have a great week ahead everyone! Hoozah!
6 responses to Multiple Exposure Tutorial
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May 28th, 2007 at 9:04 pm
Thank you for the tutorial. Loves it !
May 29th, 2007 at 12:52 am
what can i say, amazing work!
May 31st, 2007 at 10:07 pm
hey dude, gosh i owe you at least two unreturned comments. lol. yet again, another awesome tutorial. i was looking through your other posts as well, saw the one with the ice cream pics, yummmmmyyy lol. i always go for the chocochip mint xp
June 1st, 2007 at 10:14 am
Those are very good tutorials! Especially the enhancing nighttime photos one. Keep up the good work!
June 1st, 2007 at 10:28 am
teddy, do you have PS CS3? Any idea whats the difference between CS 2 and CS 3? Cos i just got CS 3 but i havent got the time to explore…
June 3rd, 2007 at 9:13 pm
Nicholas: You’re welcome! Hope it is of good use to you!
letti: Thanks for the sweet compliment! Haha
Rei: Awww don’t say that. You don’t owe me any comments, since the comments are made upon my own free will
haha! Anyways I love chocolate mint too! Maybe because of the mint 
it’s refreshing!
Grace: Thank you! Hope the tutorial is useful to you
yanni: I think the only major difference is the addition of better functions as we move from Adobe Photoshop CS to CS3. I don’t think they changed the user interface a lot, but I heard that CS3 has a lot more functionality than CS2. One of the major highlights, if not mistaken, is the improvement of Adobe Bridge and support for Raw Images, which both I don’t use
LOL!