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DPChallenge Forums >> Photography Discussion >> Double Exposure
Showing posts 1 - 9 of 9, (reverse)
03/14/2007 10:32:35 AM · #1
I was looking at some photos @ photo.net, and I saw in the details of some photos it was a double exposure for shadows and highlights then merged in photoshop. Is this like HDR? Can some one put the steps on how to expose for shadows and highlights and merge them on a canon 20d?

03/15/2007 12:30:41 AM · #2
maybe they were referring to 2 separate photos, taken at different exposure settings and merged in Photoshop or some other editing program to create a hdr photo. take 2(or more photos) at different exposures, layer them in photoshop and mask...?
03/15/2007 03:04:12 AM · #3
it sounds like HDR and tone mapping, can you link to any samples? do a search in the forums for HDR or tone mapping and there is a lot of threads. You may want to watch the tutorial section as there is supposed to be one coming very soon.

(BTW it really shouldn't matter what camera you are using.)
03/15/2007 08:02:24 AM · #4
double exposure stuff and nice photos in general

Here is a link to some of the photos im talking about. You can check out the details I believe this is where I saw it.

Thanks for the tutorial tip.

03/15/2007 08:34:42 AM · #5
This could be done using HDR, but it can be done manually also using an exposure that shows the details in the highlights as one layer and an exposure that brings out the detail in the shadows as another layer. Then you must use a layer mask on whichever layer is on top to either hide or show the parts you want. If I have a photo that has more shadow areas, I'll put that layer on the top and put the highlight layer on bottom. Then create a mask for the shadow layer (on top) and hide the parts of the photo that have the highlights (using black paintbrush).

HDR does all of this for you and is much faster. Also, to take advantage of HDR, you should really use a tripod and take more than 5 separate exposures.
03/15/2007 08:38:51 AM · #6
some seem like tonemaping or HDR. I dind't see anything that was double exposure though. that term is used when frame is exposed twice. Photomatix is the software I use for tonemaping (they have a plugin for photoshop) and HDR for combining more than one photo to bring out shadows.

To do this with more than one photo you can take one or more photo underexposed and one or more overexposed and one properly exposed. the program combines the best of all of them. this is usually done with landscapes. since many of the ones you have linked have animals in them I assume it was done with one photo which would most likely be the tone mapping plugin.
03/15/2007 09:30:38 AM · #7
The one's in your link are animals. They don't look like HDR was done.

Here is a link to many HDR shots. Some "overdone" but many fine ones.

Real HDR
03/15/2007 09:53:14 AM · #8
Originally posted by Hot_Pixel:

Can some one put the steps on how to expose for shadows and highlights and merge them on a canon 20d?


Double exposure is not possible on a 20D and must be done in post processing.

Two separate (or more) photos are taken, one to expose the shadows correctly and a second to expose the highlights correctly (and others to expose the midtones correctly).

Depending on the number of stops between highlights and shadows you will need more or fewer exposures to merge to ensure a nice gradation from highlights to shadows without blown highlights or blocked up shadows.
03/15/2007 01:19:07 PM · #9
I use "double exposure all the time to do pseudo HDR all the time -- i.e., exposing a scene with the intent of blending a double or triple RAW conversion from a single image file. The key to this technique is giving forthought to what you'll (and what can be done) in post at the time of shooting.

Here's one that had an exposure range going from 1/60sec in the shadows to 1/600sec for the sky. I exposed at a point where as few highlights were blown as possible while still retaining as much detail as possible in the shadows. In this case, 1/160sec. I then converted the RAW image three times in ACR: once for shadows, once for highlights and once with blend for midtones. I manually merged the three conversions in PS CS2 using layer masks and blending techniques I've learned over the years (and there are a thousand ways to do the masking/blending).

' . substr('//www.pbase.com/robotography/image/63614099/small.jpg', strrpos('//www.pbase.com/robotography/image/63614099/small.jpg', '/') + 1) . '

The majority of landscape shots in the accompanying gallery were processed the same way, though some could be done with only "double processing" (2 RAW conversions of the same file). Here's another ...

' . substr('//www.pbase.com/robotography/image/63614097/small.jpg', strrpos('//www.pbase.com/robotography/image/63614097/small.jpg', '/') + 1) . '

Looking at the gallery referenced by the OP (double exposure stuff and nice photos in general ) it appears that is what that photog was doing ... as i see evidence of blending between shadow/highlight areas.
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