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DPChallenge Forums >> Tips, Tricks, and Q&A >> Single JPEG for HDR result for challenge?
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AuthorThread
 03/22/2012 03:58:36 AM · #1
Hello Everyone,

Am I allowed to use one single JPEG photo to produce multiple exposures using Photoshop for Advanced Editing challenge?

Thanks!

Ang
 03/22/2012 04:46:28 AM · #2
Sure, but if you shoot RAW you can get 3 exposures out of the one image to get a truer variation in exposure, but both are legal since they are derived from one exposure.
 03/22/2012 05:08:50 AM · #3
Actually, there's no reason to use just one image if you're in Advanced Editing, unless shooting conditions preclude it. You can combine up to 10 separate images for Advanced, or you can take one and alter the exposure of it and combine those. Either or works.
For Basic, you cannot do either of these approaches, but instead must do a single image tonemap or use a program like Topaz Adjust on a single exposure. (meaning, you cannot combine multiple exposures of the same image for Basic challenges).

Message edited by author 2012-03-22 05:14:03.
 03/22/2012 06:39:14 AM · #4
Originally posted by spiritualspatula:
Actually, there's no reason to use just one image if you're in Advanced Editing, unless shooting conditions preclude it. You can combine up to 10 separate images for Advanced,


Just a reminder - this is only for HDR purposes. The 10 separate images must all be of the identical scene. Newbies often find this rule confusing.
 03/22/2012 07:06:28 AM · #5
Originally posted by GinaRothfels:
Originally posted by spiritualspatula:
Actually, there's no reason to use just one image if you're in Advanced Editing, unless shooting conditions preclude it. You can combine up to 10 separate images for Advanced,


Just a reminder - this is only for HDR purposes. The 10 separate images must all be of the identical scene. Newbies often find this rule confusing.


Very true. Thanks for clarifying my vagueness.
 03/22/2012 03:03:25 PM · #6
Originally posted by GinaRothfels:
Originally posted by spiritualspatula:
Actually, there's no reason to use just one image if you're in Advanced Editing, unless shooting conditions preclude it. You can combine up to 10 separate images for Advanced,


Just a reminder - this is only for HDR purposes. The 10 separate images must all be of the identical scene. Newbies often find this rule confusing.


and nothing can enter or leave the subsequent frames except for air.

Message edited by author 2012-03-22 15:03:46.
 03/22/2012 03:43:14 PM · #7
Originally posted by mike_311:
Originally posted by GinaRothfels:
Originally posted by spiritualspatula:
Actually, there's no reason to use just one image if you're in Advanced Editing, unless shooting conditions preclude it. You can combine up to 10 separate images for Advanced,


Just a reminder - this is only for HDR purposes. The 10 separate images must all be of the identical scene. Newbies often find this rule confusing.


and nothing can enter or leave the subsequent frames except for air.


Or move within the frame. Strictly speaking, an HDR scene that had the wind blowing grass or clouds moving would be illegal.
 03/22/2012 03:52:02 PM · #8
Originally posted by Spork99:
Originally posted by mike_311:
Originally posted by GinaRothfels:
Originally posted by spiritualspatula:
Actually, there's no reason to use just one image if you're in Advanced Editing, unless shooting conditions preclude it. You can combine up to 10 separate images for Advanced,


Just a reminder - this is only for HDR purposes. The 10 separate images must all be of the identical scene. Newbies often find this rule confusing.


and nothing can enter or leave the subsequent frames except for air.


Or move within the frame. Strictly speaking, an HDR scene that had the wind blowing grass or clouds moving would be illegal.


Though unless it's a distinct object that has moved and not wind-blown-grass/clouds/water/etc., it'd be unlikely to be ruled illegal. Think neutral density filter. You cannot isolate a single sharp moving object from a long exposure, so you cannot take an object from a single frame from a multiple exposure. But the motion-blurred stuff should be just fine.
 03/22/2012 05:12:45 PM · #9
To make clear to those who are puzzled by the fine distinctions of what is and is not legal in a multi shot HDR; the current understanding came out of one of Alex Saberi's amazing nature shots


The swan entered the shot in one frame, and left after, so the resulting image, after much discussion was ruled illegal, since such a major element was not consistently in the multiple frames of the exposures that went into the HDR. The wheeling stars which track through the sky were ruled legal though they moved they were present in all shots (and you can't really do anything about them). It is a fine distinction which had to piss off Alex, but it makes some sense to me in retrospect.

Message edited by author 2012-03-22 20:01:27.
 03/22/2012 11:23:11 PM · #10
OK, thank you very much. I shall shoot RAW then since I can get true variation! :-)

Originally posted by BrennanOB:
Sure, but if you shoot RAW you can get 3 exposures out of the one image to get a truer variation in exposure, but both are legal since they are derived from one exposure.
03/22/2012 11:23:51 PM · #11
Thank you all for the wonderful replies. I appreciate every one of them. Thanks.
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