You will need the High Pass filter.
Well, I've looked at photoshop tutorials to HDR effects, and we don't have all the effects photoshop has, but I've managed to experiment enough to come up with a recipe for an extreme HDR effect.
I'm going to go through this step by step, for beginners
Once you have an image, duplicate the base layer (see buttons at bottom of layer dialog)
Double-click the top layer to edit the details of it
Name it, "Overlay", and set the color blend mode to "Overlay"
Your layer stack should look like this:
Make your layer Black and White
Apply a Gaussian blur
Set it to a level high enough that your image looks kind of spray-painted, like this:
Remember that number
Invert the colors
Your image should now look like this (compared to its original self)
Make a new layer & move it to the top
You can use the up arrow on the layer dialog to move it up
Rename the layer to "Color Burn" and set the layer blend mode to "Color Burn"
For this step, you will need the High Pass filter.
Set the radius at about half of the radius you set the blur to earlier
Select the background layer
Adjust the Saturation and Lightness
Set it them to whatever looks best to you
Merge the middle layer with the bottom one by selecting it and pushing "merge down"
Do the same with the last layer
Adjust whatever there needs to be more or less of. Brightness, Contrast, Saturation, White balance, or whatever other filters you have in store will do for it.
Disclaimer: Your image may not look great, as HDR effects are not for every image, but it will work very well for the right photo. I encourage you to experiment between steps and try new things to get it work right for you.
Edited by ssaamm, 14 February 2011 - 02:01 PM.