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08/29/2007 08:16:06 PM · #1 |
| Does anyone have a good HDR tutorial. I've been trying to do HDR images but it just hasn't been working out for me. |
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08/30/2007 11:06:02 AM · #2 |
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08/30/2007 11:11:36 AM · #3 |
check the LEARN menu item, pretty sure there are a few in there showing different ways to do it.
edit to add...you might be actually needing TONE MAPPING.
Message edited by author 2007-08-30 11:12:25. |
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08/31/2007 01:31:33 PM · #4 |
I'd love to know what the exact difference is between Tone Mapping and HDR.
is it that HDR is composing one image from multiple images (or multiple variants of the same image thanks to RAW) while Tone mapping is done with a single image?
Anyhow, I use this method. Go to channels, select all channels. Or just one if you feel like it. Control Click on the box to load that as a selection or hit the dotted circle at the bottom.
Go to your levels or curves layer or whatever and discard the default white mask, then simply load a new mask. Now you hit control-I and invert the selection. Wa LA, you just used the inverse of your image to tell PS where the highlights/shadow areas are... now if you want to boost things up with your levels layer or curves or Bright/Contr go ahead.
To Tweak the mask, click on the mask, go to image>adjustments>brightness contrast.
Then play with DECREASING the contrast and both increasing and decreasing the brightness. This will change the way that the layer affects everything. Now if you have some things in the pic that are supposed to be black, you are going to need to throw a brush around. I didn't find that this was really difficult to do with a big brush and some pretty loose strokes in the images I was doing it in today.
I've used this method quite a bit in the last couple of months and it usually gives excellent results. I used it about 30 times today in fact. I got quite a bit more leeway out of some pictures that were BADLY underexposed thanks to people mucking about with the lights while I was shooting.
It does leave some questions for me as to how to do things because I am not a photoshop expert, just sharing what works for me.
Enjoy!
Oh yeah ETA: this is a very quick and very dirty way of doing this. If you want to spend an hour on a picture because it means something and you have a RAW, then by all means, do it the right way. I will eventually start dabbling with this too, but I've got to get organized for the next semester yet.
Cheers.
Message edited by author 2007-08-31 13:32:40. |
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08/31/2007 01:56:33 PM · #5 |
Originally posted by eschelar:
I'd love to know what the exact difference is between Tone Mapping and HDR. |
Tone mapping is a component of the HDR workflow. In Photomatix it is called tone mapping, in CS2/3 it is called shadow/highlight.
The way true HDR works is that whichever program you are using combines several images (as many as you like) into a single image with a vastly increased tonal range. This is a 32-bit image and it looks like hell because your screen can't display the total tonal range. Then you do the tone mapping to "convert" that extended-range image into something that works in 16-bit on a computer screen. So you can't HAVE HDR without some variant of tone mapping at work.
When working from a single RAW file, photomatix generates an expanded-range, "pseudo HDR" image, and you tone map that.
You can also use tone mapping on ANY single image if you wish. Think of it as CS2's shadow/highlight adjustment. It's basically the same thing.
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Regarding your masking technique, photoshop is set up to do the same thing for you with a very sophisticated feathered highlight mask you can generate with cntrl-alt-tilde (~ is tilde). Cntrl-shift-I will, of course, give you the inverse for a shadow mask.
On your image, hit cntrl-alt-tilde and then cntrl-j to get a new layer of only the selected area. Then go back to base layer, cntrl-alt-tilde, cntrl-shift-I, cntrl-j to get a new layer with the shadow selection on it.
Set the shadow layer to "screen" mode and the4 highlight layer to "multiply" mode, and adjust the relative opacity of the two layers to suit.
R.
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09/01/2007 10:35:29 AM · #6 |
| Thanks for the clarification! Will get this into my workflow ASAP. |
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