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Photo Manipulation: Discuss Multiple Exposure with Digital...Hello, A while ago (before I had my digital), I used my regular camera to create Multiple Exposure pictures. It ...
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Old 05-12-2006, 08:11   #1 (permalink)
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Multiple Exposure with Digital

Hello,


A while ago (before I had my digital), I used my regular camera to create Multiple Exposure pictures. It involved compensating three stops when I used 8 exposures in one frame, the outcome was amazing, I still have big Yellow flower hanging in my daughter's room.

Now I have Digital SLR (Canon Rebel), and was looking for same effect.

I found tutorial which suggest taking 8 pictures with 3 stops compensation and then putting each on different layer, and use screen blending mode to all layers except the bottom one, but its not working well. I use GIMP not Photoshop.

Anyone have experience?
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Old 05-12-2006, 10:06   #2 (permalink)
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Re: Multiple Exposure with Digital

does your camera itself not multi expose for you? I am sure mine has a setting to do that.
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Old 05-12-2006, 10:50   #3 (permalink)
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Re: Multiple Exposure with Digital

No, it does not have this feature, the non digital one could do it.
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Old 05-12-2006, 17:06   #4 (permalink)
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Re: Multiple Exposure with Digital

If you are shooting the same scene, with say someone moving to different positions for each shot, then you need to ensure exposure is same for all shots. I don't know how GIMP works, but in you would have new layers for each different shot, then use the mask tool to mask back the area of shot you want to appear from underneath (eg. person in different position). That way you have a perfectly exposed overall shot.

Hope that helps.
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Old 06-12-2006, 00:14   #5 (permalink)
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Re: Multiple Exposure with Digital

Look at the attached, its tutorial for Photoshop, GIMP is same like PS, it has layers and bending mode, its open source and therefore free.

But the outcome is not what expected, can someone try with photoshop, no need for grand picture just 8 pictures of an object from different angles with 3 stops compensation and all layers aside from bottom one with screen blending mode
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Old 06-12-2006, 00:15   #6 (permalink)
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Re: Multiple Exposure with Digital

Sorry the attachment
Digital Darkroom Instruction
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Old 06-12-2006, 15:33   #7 (permalink)
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Re: Multiple Exposure with Digital

I thought most SLR cameras include bracketing which gives you 3 exposures. If you use 2 or 3 stop bracketing with RAW files that should give you a dynamic range of at least 16 stops once blended. Of course you can take more exposure and blend them. The key thing is that this is only relevant to still subjects and you will need to use a tripod. You should fix the aperture and only vary the exposure time so that the depth of field etc. is the same for each exposure. You can certainly blend these on PhotoShop using layers. For example you can erase through one layer to a layer below or cut out using selections.
A much quicler way is to use blending software by PhotoMatix see HDR photo software & plugin - Tone Mapping, Exposure Blending & HDR Imaging for photography

I have tried the trial professional version and it blended 3 exposures in seconds better than I managed manually (several hours work).
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Old 06-12-2006, 23:39   #8 (permalink)
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Re: Multiple Exposure with Digital

Yes, my SLR give me auto bracketing (3 exposures with +- compensation).

I saw Photomatix, its highly recommended but I will not pay the money (not yet), as all I ma doing is playing, and 100USD for photo play is still expansive.
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Old 07-12-2006, 19:22   #9 (permalink)
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Re: Multiple Exposure with Digital

I am not sure, but it seems to me that we are talking about 2 quite different things here.

One is expanding the dynamic range in an image with signigicant highlights and shadows. That is the tripod, shutter variation to create multiple meterings and then "merging".

The other is to put multiple images in the same frame.

I have not yet done either

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Old 07-12-2006, 20:23   #10 (permalink)
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Re: Multiple Exposure with Digital

Note Photomatix has a trial version , that allows you to play for free
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Old 07-12-2006, 20:37   #11 (permalink)
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Re: Multiple Exposure with Digital

Hmmm! I am confused as to what you are trying to acheive here.
HDR is as it says on the can, High Dynamic Range. This allows you to effectively go beyond the normal EV range of sensor.
Multiple exposures using a film camera were commonly used to give the illusion of, for instance, the same person or object being in two different places in the same shot.
This is very easy to acheive digitally and only requires the use of a tripod and no exposure compensation.
But as I said, without understanding what you are trying to do............
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Old 08-12-2006, 01:14   #12 (permalink)
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Re: Multiple Exposure with Digital

Indeed two separated issues got mixed here, and I enjoyed exploring both.

HDR is new to me and apparently require tools or hard work, so added to my future tasks.

But for multi exposure, I was confused by the tutorial I pasted above, as it asked for exposure compensation and layers blended on screen mode, and the result was not what I was expecting. Once i started using different blending mode it looks better.
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Old 08-12-2006, 16:04   #13 (permalink)
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Re: Multiple Exposure with Digital

The exposure compensation needed depends on how many images you are using but not on that alone. Remember you will be erasing some parts of each layer to allow other parts to show through. A very simple version is this one (my smart and slob selves having an argument :o)):



If you are wanting to make parts look like they overlap, some of the erasure needs to be quite tight and hence the most important factor is that each layer should be evenly lit. I set up and then once I have worked out the best lighting, switch to fully manual so that the camera does not try and change the settings between shots.

You'll be taking them into Photoshop/Gimp/PSP, etc afterwards anyway so any imbalance in the lighting can be easily balanced then.

Cheers,
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