The one and only pre-requisite is to have Adobe Photoshop CS2 or above, due to its in-built automated HDR merging function.
Step 1: Automated HDR Merger
Open Photoshop, go to File > Automate > Merge to HDR. A window will open to request you to load the photos you would want to merge.
Please remember to check the Attempt to Automatically Align Source Images option. This is the annoying part because Photoshop does not check this option by default, so if you missed it, you’ll have to wait for a long time (since Photoshop’s HDR merging takes a significantly longer time than Photomatix) before being given the option to start again.
After you click OK, the whole process really get automated, but you’ll have to wait. Photoshop will load all the photos, align them meticulously and then merge into one HDR.
Step 2: Select Photos to be Included
A window will open, and you can see the whole list of photos you’ve asked Photoshop to merge for you. Normally the results will appear just nice, but when the resultant HDR looks too white or too dark, you’ll have to exclude some photos. This can be done on the sidebar on the left, where you can tick to include and untick to exclude certain photos.
After clicking OK, it’ll take even more time for Photoshop to get things done 
this is annoying but too bad, you don’t really have the option to stop it (and it takes up quite a lot of resources!). A preview will appear after it’s done:
Step 3: More Tweaking
The resultant HDR is a 32-bit image, but it is made to look normal on your screen. However, you’ll realise that none of the photo manipulation tools are going to work on it (like filters, auto colour and etc). You’ll have to convert it to a 16-bit mode first (not to 8-bit mode since you do not want to lose details yet!).
Upon converting to 16-bit mode, a HDR Conversion dialogue box will open and provides you with several options. Since I have not experimented all the options thoroughly, I’ll stick to the Exposure and Gamma option.
After this you’ll be able to manipulate your photos just as described in the previous Photomatix tutorial section. Oh, don’t forget to save! 
Here is the final product:
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14 responses to HDR Merging & Tweaking Tutorial
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February 24th, 2008 at 6:25 pm
Wow!! Another tutorial!!! I love it!!!
Check out Adam Danial’s last blog post: 2nd post for 2008 ??
February 24th, 2008 at 8:58 pm
Hey, teddY. It’s a great tutorial. Where can I get the Photomatrix. I wanna try it too. But it takes many steps. I think the photoshop one is better than the Photomatrix
February 24th, 2008 at 9:23 pm
Adam: Thank you. You can go to HDRSoft to get Photomatrix as a free trial version, but be warned that HDRs larger than 640*480 will get a Photomatix watermark embedded in it. Although the Photomatix tutorial is a little bit more complex, it gives you the best results.
February 25th, 2008 at 12:19 pm
i always wanted to try HDR..
heard so much abt it!!!…
thx ted!!!…
looks awesome!!!
Check out eddy’s last blog post: don.be
February 25th, 2008 at 12:44 pm
I have been meaning to try making some HDRs. I think your tutorial came at the right time! Thanks!
Check out Id’s last blog post: You Don’t Open It; You Turn It On.
February 25th, 2008 at 10:44 pm
eddy: Thank you!
Id: Hey Id thanks for dropping by! Hope this tutorial is of good use to you, heh.
February 26th, 2008 at 3:01 am
hey, thanks for the tutorial and resources. I’ve downloaded photomatix, but like you, i probably will do all the final tweaking in photoshop. Thanks for making it all simple. can’t wait to start generating some!
Check out letti’s last blog post: Chili, Cake & Pink Flamingos
February 26th, 2008 at 9:08 pm
letti: You’re welcome! And oh you’ve downloaded Photomatix! Sounds like you’ll be going to have a lot of fun with HDR
anyway yeap Photoshop is better at photo/image manipulation and touchup than photomatix. Basically Photomatix is a HDR generating machine 
that’s all.
Grace (at Neonscent): Thanks for linking!
February 28th, 2008 at 5:35 pm
I guess it’s time to get photomatix. xD xD!!
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March 1st, 2008 at 9:10 pm
teddy.. u made the most “learning-friendly”
i know i told u that i love your tutorial many times
but i cant stop myself to tell u again n again!
love your tutorial! keep it on!
Check out lunaticgal’s last blog post: Canot find the song you want?
March 2nd, 2008 at 2:43 pm
ingSiang: If you want to make your own HDRs, Photomatix is one of the best software to use
heheh.
lunaticgal: Thanks for the compliment, haha! Usually when I write tutorials I’ll try my best to make it understandable to those who have little working experience with photoshop
anyway using too complicated terms will also throw people off, haha!
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February 26th, 2008 at 8:25 am
[...] Launches Morph Concept Phone- A sleek, morphing phone from Nokia at Brown Baron’s blog. HDR Merging & Tweaking Tutorial- teddY teaches you how to merge + tweak on Photomatix and Adobe Photoshop. Very detailed; nice [...]
March 14th, 2008 at 10:06 am
[...] have auto exposure bracketing. If you want to know more about creating your own HDR, you can visit my tutorial (or Google it if you prefer [...]
July 1st, 2008 at 1:56 pm
[...] Published a HDR tutorial - the best tutorials I’ve written so far, IMHO. [...]