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11/18/2006 09:31:40 PM · #1 |
| when creating an hdr image I know it's best to use multiple images from different exposueres, but can't you just use one image by just changing the exposure, and if so how would I go about doing this? |
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11/18/2006 09:34:41 PM · #2 |
Originally posted by hailstorm86:
when creating an hdr image I know it's best to use multiple images from different exposueres, but can't you just use one image by just changing the exposure, and if so how would I go about doing this? |
changing the exposure compensation in RAW.
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11/18/2006 09:35:56 PM · #3 |
| I haven't done HDR, but from what I understand, you can use the same image multiple times by changing the exposure compensation rating in your RAW editor, and saving each one. |
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11/18/2006 10:13:45 PM · #4 |
| I just shot some pictures in Raw and have no idea how to get them into PS. Can some one please help?? |
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11/18/2006 10:17:24 PM · #5 |
Originally posted by hailstorm86:
when creating an hdr image I know it's best to use multiple images from different exposueres, but can't you just use one image by just changing the exposure, and if so how would I go about doing this? |
One image has a set dynamic range. Only so much information is captured from the darks to the lights. You can tinker with those areas all you like, but you are still dealing with the same Dynamic Range.
High dynamic range uses multiple exposures. Thus you are using an expanded range of dynamics because when combined together you might have a final image that covers, using fictious numbers, a total range of 18 stops rather than 7.
So no, you can not do HDR of one exposure. |
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11/18/2006 10:22:06 PM · #6 |
Originally posted by kelli_K:
I just shot some pictures in Raw and have no idea how to get them into PS. Can some one please help?? |
you should just be able to open the files like any other file. If you can't do that then you need to download a file from the Adobe website that enables PS to read the raw format. Very easy to do...I just did it myself but I cannot remember how I did it.
Just found the thread that helped me do this...link
Message edited by author 2006-11-18 22:24:43. |
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11/18/2006 10:24:43 PM · #7 |
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11/18/2006 10:32:00 PM · #8 |
You can process a single RAW file multiple times with different exposures and then combine them. That's what I did with this shot, in order to get the windows and the interior.
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11/18/2006 10:44:13 PM · #9 |
Thank you. I just downloaded Rawshooter...now to see if I can open my pics.
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11/18/2006 11:16:14 PM · #10 |
Originally posted by routerguy666:
Originally posted by hailstorm86:
when creating an hdr image I know it's best to use multiple images from different exposueres, but can't you just use one image by just changing the exposure, and if so how would I go about doing this? |
One image has a set dynamic range. Only so much information is captured from the darks to the lights. You can tinker with those areas all you like, but you are still dealing with the same Dynamic Range.
High dynamic range uses multiple exposures. Thus you are using an expanded range of dynamics because when combined together you might have a final image that covers, using fictious numbers, a total range of 18 stops rather than 7.
So no, you can not do HDR of one exposure. |
You are right that one RAW image contains only so much dynamic range, however, that RAW file is a 12 bit image file. When you convert that file to jpeg (or whatever format you choose), you drop to 8 bits. That is where you lose dynamic range that is in the RAW image, but not in the output file. By processing a RAW file you pick which 8 bit you take into that output file. So, by processing a RAW file 2 or more different ways and combining them with HDR processing, you can indeed recover some or all of that "lost" dynamic range.
Message edited by author 2006-11-18 23:17:17. |
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11/18/2006 11:41:39 PM · #11 |
| None of which is relevant to creating an HDR image. |
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11/18/2006 11:43:15 PM · #12 |
I'm aware of what Bear is into. Whatever you'd like to call it, it's not HDR. Each of those photos exhibits the same dynamic range as the others. Brightening one region of an image does not mean you just magically captured wavelengths of light that weren't already there. |
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11/19/2006 12:09:16 AM · #13 |
Originally posted by routerguy666:
None of which is relevant to creating an HDR image. |
Hmmm, well, maybe that's your narrow definition of HDR.
Why don't you enlighen us with your vast expertise and impressive results on the matter?
Message edited by author 2006-11-19 00:12:24. |
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11/19/2006 12:19:19 AM · #14 |
Originally posted by routerguy666:
I'm aware of what Bear is into. Whatever you'd like to call it, it's not HDR. Each of those photos exhibits the same dynamic range as the others. Brightening one region of an image does not mean you just magically captured wavelengths of light that weren't already there. |
Bear doesn't call it HDR, he calls it Tone Mapping. Bear is looking for ways to emulate HDR photography in DPC-legal images. When you create a "true" HDR image from several exposures, the first step (combining the exposures) produces and HDR image that is far beyond the capability of the screen to display, and it looks like crap. Tone Mapping is the finishing step you apply to an HDR image to map its tonalities to the display medium.
You can apply tone mapping to a single, darker image in 16-bit TIFF and greatly enhance the rendition of the displayed image. That's what I did with the elephants. Basically, it doesn't do anything you can't do with curves, shadow/highlight. etc, but it's a more straightforward process; it all happens in a single interface, and it's pretty clean.
R. |
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11/19/2006 12:47:11 AM · #15 |
Originally posted by Spazmo99:
Originally posted by routerguy666:
None of which is relevant to creating an HDR image. |
Hmmm, well, maybe that's your narrow definition of HDR.
Why don't you enlighen us with your vast expertise and impressive results on the matter? |
While it is all the rage on DPC to promote mindthink where every term and phrase is open to countless definitions generally based on how favorable they are to the person being affeced by them, that does not mean that in the real world certain terms do not have concrete definitions.
You are presumably capable of reading. Go read the technical details of HDR for yourself. If you still think it's a matter of playing with curves on a single exposure - grand. |
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11/19/2006 09:20:23 AM · #16 |
wow guys - let's not be all pissy here.
It's just a discussion and in the scheme of things, 10 years from now will it really matter? Sheeeeesh. |
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11/19/2006 11:22:52 AM · #17 |
no because our camaras will have a built in option to expand dynamic range to 15 stops of light ;}
actually sigma is already working on this...
Originally posted by Jutilda:
wow guys - let's not be all pissy here.
It's just a discussion and in the scheme of things, 10 years from now will it really matter? Sheeeeesh. |
Message edited by author 2006-11-19 11:23:44.
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