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Old Mar 6, 2006, 3:50 PM   #1
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Several months ago I posted a photo that consisted of 2 merged frames, one light and one dark, that extended the dynamic range of my digicam (fuji S5100).

Today I took the resulting image and was playing around with GIMP (I only have photoshop elements 1.0).

I did the following and notice a nice effect:

1. Dup layer

2. Selected only the RGB color layers and deselected the alpha

3. I went to filters -> color -> "color to alpha..."

4. I choose darken only at about 10%

The result is that I seem to have further extended the dynamic range off the image, particularly on the water. It is subtle but noticable.

Below is a before and after image. Do you thing that the second is an improvement over the first?


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Old Mar 6, 2006, 3:50 PM   #2
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And the after image:
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Old Mar 6, 2006, 3:58 PM   #3
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I might be able to ascertain a small difference but to me it's so negligible as to be unnecessary, at least at web dimensions. I imagine it would be worth doing on a large print though.
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Old Mar 6, 2006, 3:59 PM   #4
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I realize the result is slight and that these are resized images which are harder to tell the difference. If you load them in an editor as layers and switch between them you can see the difference better.
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Old Mar 6, 2006, 4:01 PM   #5
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I don't have time right now but perhaps I'll do a little more exterme version for the web. I gotta leave now though.
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Old Mar 6, 2006, 7:34 PM   #6
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it seems to have warmed up the picture a little bit, but as you say, noticing any differences in the DR is nigh impossible at this resolution and size.. i will take your word for it on the original
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Old Mar 6, 2006, 9:56 PM   #7
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it sounds like a lot of work.

a bit of shadow/highlight's work, a bit of contrast and a saturation boost and this is

what i was able to do with your original.

btw, beautiful shot!

all i did was add a bit of vibrance to an already fantastic capture..


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Old Mar 7, 2006, 7:43 AM   #8
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It's funny how when we take a great shot we keep playing with it to see if we can tweak it even better.

This highlight detail increase in the water issubtle but noticible. Using the method mentioned in the beginning of this post seemed to have minimal effect on the non-water portion of the image (there is a slight warming though as hards pointed out and also a little darkening of the foliage towards the bottom of the image). Nevertheless, I found the results interesting.

Here are some 100% crops with the above method I used:

Before:



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Old Mar 7, 2006, 7:44 AM   #9
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After:


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Old Mar 7, 2006, 7:45 AM   #10
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Before:
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