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Thread started 14 Apr 2008 (Monday) 21:11
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Need advice for exposure

 
beepclick
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Apr 14, 2008 21:11 |  #1

This shot seems hazy and rather weak in terms of color/saturation. I didn't have time to take multiple shots with different settings.

Any suggestions on how to improve this exposure would be welcome.

thanks.

IMAGE: http://i31.photobucket.com/albums/c358/vectorcafe/SHOREBIRD.jpg

The histo
IMAGE: http://i31.photobucket.com/albums/c358/vectorcafe/SHOREBIRD-HISTO.jpg

And the exif:
Camera Model Canon EOS DIGITAL REBEL XTi
Shooting Date/Time 4/14/2008 6:00:25 PM
Shooting Mode Aperture-Priority AE
Tv( Shutter Speed ) 1/250
Av( Aperture Value ) 6.3
Metering Mode Evaluative Metering
Exposure Compensation 0
ISO Speed 200
Lens EF70-300mm f/4-5.6 IS USM
Focal Length 300.0 mm
Image Size 3888x2592
Image Quality Fine
Flash Off
White Balance Mode Daylight
AF Mode AI Focus AF
Picture Style User Defined 3(Standard)
Sharpness 3
Contrast 0
Saturation 0
Color tone 0
Color Space sRGB
Noise Reduction Auto


I think I read that the histogram is supposed to be weighted to the right side, with the middle to the left side about half as high up on the charts.

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poloman
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Apr 14, 2008 21:39 |  #2

It is underexposed.
I would lighten it and give it a going over in levels and curves.
Boost saturation to taste.
See if a high pass sharpen helps or creates too much noise.
If you enable image editing, I will give it a quick shot. :)
It is a really neat image.


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beepclick
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Apr 14, 2008 21:46 |  #3

poloman wrote in post #5330378 (external link)
It is underexposed.
I would lighten it and give it a going over in levels and curves.
Boost saturation to taste.
See if a high pass sharpen helps or creates too much noise.
If you enable image editing, I will give it a quick shot. :)
It is a really neat image.

That would be great. Let me see if I can turn Image Edit on.\

OK, poloman, Image Edit turned on.


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poloman
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Apr 14, 2008 22:01 |  #4

Here you go....


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beepclick
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Apr 14, 2008 22:11 as a reply to  @ poloman's post |  #5

That looks much better. If you have time, what tools did you use for that?
I tried sliding the Levels controls a little in photoshop but it just seemed to get more overexposed.

thanks a lot, poloman.


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poloman
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Apr 14, 2008 22:18 |  #6

In levels, slide the right slider until it is just under the right hand side of the histogram. Move the center slider to 1.08.
Adjust saturation a little to the right.
Make a duplicate layer...Choose filter, high pass. Set the control in the box for 2.7. Set the layer designation to hard light. Adjust the opacity to 48%.
Flatten layers.
Dodge a bit around the eye to make it show up.
That's it...hope it helps. :)


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beepclick
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Apr 14, 2008 22:24 |  #7

poloman wrote in post #5330613 (external link)
In levels, slide the right slider until it is just under the right hand side of the histogram. Move the center slider to 1.08.
Adjust saturation a little to the right.
Make a duplicate layer...Choose filter, high pass. Set the control in the box for 2.7. Set the layer designation to hard light. Adjust the opacity to 48%.
Flatten layers.
Dodge a bit around the eye to make it show up.
That's it...hope it helps. :)

Good stuff. I hadn't heard of using hard light setting for high pass, mostly overlay or soft light. Not up to speed on the dodge tool, but can look it up.
I didn't know to use the center slider in Levels, either.

Much appreciated.


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PhotosGuy
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Apr 15, 2008 08:16 |  #8

I didn't have time to take multiple shots with different settings.

Try this next time & take all your shots at the right setting:
Need an exposure crutch?
More on how the subject affects the exposure in Post # 47


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Have you thought about making your own book? // Need an exposure crutch?
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poloman
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Apr 15, 2008 08:17 |  #9

The dodge tool looks like a small dark magnifying glass on the tool bar. Set opacity to about 15% and use a soft edged brush. This will lighten whatever you brush it across. This is very helpful for use on pupils, eyelids and teeth.
High pass with hard light will give you the sharpest result. Use the other settings (overlay or soft light) for a softer look.
Glad I could help. :)


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beepclick
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Apr 15, 2008 10:37 |  #10

PhotosGuy wrote in post #5332668 (external link)
Try this next time & take all your shots at the right setting:
Need an exposure crutch?
More on how the subject affects the exposure in Post # 47

Man, that's a little confusing (and I'm not that dumb - Mensa member).

I went out on the balcony with the xti, in M mode, and adjusted shutter speed until the needle was centered - so that's something new learned today (thanks, PhotosGuy).

If I meter off the palm of my hand as suggested in one of your links, does that exposure setting stay set for multiple shots, or do I meter off my hand for every shot?

I need to study the exposure links you provided, the Sunny-16 and all that stuff. Time is limited here on vacation, will have to wait until I return.


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beepclick
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Apr 15, 2008 10:56 as a reply to  @ beepclick's post |  #11

ok, I took a shot of the pool. first image. then i tried to meter of my hand, the 70-300 wouldn't lock, so I metered off the stone walkway in the shade, 2nd image. then I held the shutter halfway to meter off the stone walkway (2nd image) and moved the camera to focus on the pool. the exposure light on the far right was blinking and I couldn't take the shot.

So how do I meter off the stone walkway and then make a picture of the pool if the camera won't do it?

here's the pool

IMAGE: http://i31.photobucket.com/albums/c358/vectorcafe/POOL.jpg
pool exif
Camera Model Canon EOS DIGITAL REBEL XTi
Shooting Date/Time 4/15/2008 10:45:14 AM
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/320
Av( Aperture Value ) 8.0
Metering Mode Evaluative Metering
ISO Speed 100
Lens EF70-300mm f/4-5.6 IS USM
Focal Length 70.0 mm
Image Size 3888x2592
Image Quality Fine
Flash Off
White Balance Mode Daylight

the walkway
IMAGE: http://i31.photobucket.com/albums/c358/vectorcafe/WALK.jpg
walkway exif
Camera Model Canon EOS DIGITAL REBEL XTi
Shooting Date/Time 4/15/2008 10:46:09 AM
Shooting Mode Aperture-Priority AE
Tv( Shutter Speed ) 1/320
Av( Aperture Value ) 5.6
Metering Mode Evaluative Metering
Exposure Compensation 0
ISO Speed 100
Lens EF70-300mm f/4-5.6 IS USM
Focal Length 70.0 mm
Image Size 3888x2592
Image Quality Fine
Flash Off
White Balance Mode Daylight

So, after I took the shot of the walkway, resulting in the exif right above, and then focused on the walkway again to meter and swung the viewfinder up to the pool area, the camera, which was prepared to expose the shady walkway, was telling me that exposure was not acceptable for the pool (telling me by the exposurelight on the far right in the viewfinder blinking)?

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beepclick
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Apr 15, 2008 11:15 as a reply to  @ beepclick's post |  #12

OK, tried the "Sunny 16" method in M mode.
Not too bad, except I didn't realize I was in Manual Focus mode, so all out of focus. But it appears the 1/ISO shutter @ f/16 might be a good approach for a beginner like myself.

exif same for all 3

IMAGE: http://i31.photobucket.com/albums/c358/vectorcafe/pool-16.jpg
IMAGE: http://i31.photobucket.com/albums/c358/vectorcafe/sunny-16-two.jpg

IMAGE: http://i31.photobucket.com/albums/c358/vectorcafe/sunny-6-three.jpg

--Before someone shouts out "very out of focus" I was in manual focus mode (by accident)

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beepclick
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Apr 15, 2008 11:26 as a reply to  @ beepclick's post |  #13

Ok. Thought I would take the same image in Full Auto mode to see what the camera decided. The Digic II narrowed the aperture, increased the shutter and ISO, for a result pretty similar to the Sunny-16 result in M mode.

IMAGE: http://i31.photobucket.com/albums/c358/vectorcafe/pool-Auto-mode.jpg

Camera Model Canon EOS DIGITAL REBEL XTi
Shooting Date/Time 4/15/2008 11:20:04 AM
Shooting Mode Auto
Tv( Shutter Speed ) 1/500
Av( Aperture Value ) 14.0
Metering Mode Evaluative Metering
Exposure Compensation 0
ISO Speed 250
Lens EF70-300mm f/4-5.6 IS USM
Focal Length 70.0 mm
Image Size 3888x2592
Image Quality Fine
Flash Off
White Balance Mode Auto
AF Mode AI Focus AF
Picture Style Standard

So, for me for the next couple days here in sunny Florida, do I gain anything by using M mode or Full Auto if the results are similar?

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poloman
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Apr 15, 2008 11:39 |  #14

You will have trouble with the camera's metering when you are shooting a subject that is very white or very black. The camera wants to see everything as 18% gray so it will underexpose a white subject and overexpose a black one. You can compensate for this by using + or - exposure compensation. Shooting in manual will give you the most consistent performance as long as the light is consistent. If your subject is backlit you will want to use + exposure compensation to brighten the subject enough to be clear. The palm of the hand trick is a way of simulating an 18% gray card and setting the exposure based on the light hitting your hand. When you use this method, you will want to get the light hitting your hand as it would the subject. Experiment...........t​here are no instant solutions. Everyone can take pictures. Can everyone do it well?


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Cody21
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Apr 15, 2008 12:14 |  #15

Let me throw my 2 cents in here : I actually liked your 1st pool shot better than the 2nd one. It just has more color balance to it - the 2nd one looking like your meter got fooled and didnt expose it properly. However, you're on vacation - so whether you wish to spend time experimenting and learning in lieu off just 'vacationing' is what you're up against. Mabe you should just stick to FULL AUTO for the "must have" memories? Then spend some time going ALL MANUAL ? For all MANUAL, you should be "chimping" (checking your histogram) after your shot -- just to see if things are to far LEFT or RIGHT (you want the exposure mostly towards the right - just don't hug it too tight.)

But in general, my experience has been that FULL AUTO gets very undesirable results if/when the meter assumes incorrectly; resulting in UNDER/OVER exposed images. Which metering mode you have set will ALSO have an effect on this. And lastly, if you shoot in RAW mode, you'll have much more flexibility to "adjust" the images in PP when you get them home.

I went RAW and won't look back ... YMMV

Have fun!


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