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FORUMS Cameras, Lenses & Accessories Small Compact Digitals by Canon 
Thread started 24 Aug 2006 (Thursday) 11:22
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Image brightness in A620

 
Jon
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Aug 24, 2006 11:22 |  #1

yiggy999 wrote:
Jon,

You seem to have an extensive bit of knowledge concerning the A620 so I thought I would ask about a problem I am having.

It seems that when I take most pictures on the A620 it will look beautiful on the display, but after transfering it to my computer, the image is significantly darker.

I don't believe it is the monitor settings because it actually prints out darker as well. If I go in and play with the shot in PS I can bring it back to something usable.

Do you know why I might be seeing this shift?

Typically I am using the AUTO settings.

Thanks for any guidance you can provide.

Scott

Got this as a PM - remember, folks, if you have a question someone else might be wondering the same thing.

Your camera's LCD is not intended for critical viewing of your photos - it's set up so you can see the picture even in generally bright conditions.

If you want to judge your exposure, turn on the detailed information view (from where you've got the picture in the display, press "Display" twice; the first time you'll see minimal shooting information; the second you'll see a histogram displaying the light-dark distribution of tones in your photo). Use the histogram to judge your exposure, not the picture. A good histogram for a typical scene should cover the whole range of the graph, from dead black on the left to bright white on the right. If you're missing one or the other of those, it won't reach all the way, but in general you want it to be centered on the graph.


Jon
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TMR ­ Design
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Aug 24, 2006 11:46 |  #2

Hi Jon,

I just tried what you are saying and I am not sure I understand what I should be looking for in a 'perfect' exposure setting.

I tried many exposures and then also tried the camera in Program and Auto to see what differences there might be.

I can't find one picture, Manual or Auto that covers the entire graph from left to right.
Can you perhaps clarify exactly what I should be looking for?
The question that comes to mind is ..... based on the histogram, does that mean I should be making particular adjustments? If the exposure looks good and the end result looks good then should I have done anything?

I know that the same picture can be taken with many different settings and all could look good but I do want to understand what is technically the best picture and then make artistic decisions after that.

Thanks.


Robert
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Jon
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Aug 24, 2006 12:04 |  #3

If your scene has bright white and deep black in it, the histogram should cover the whole bar; if you don't have any deep blacks, it won't reach as far to the left; if you don't have any bright whites it won't reach to the right-hand edge. If the graph is bunched up to one side or the other, try adjusting your exposure. A graph that's mashed up to the left is probably underexposed; if it's way over to the right you're probably overexposed. Of course your typical black cat in a coal bin or polar bear in a snowstorm will be bunched up despite everything you try.

Notice the attached shot (20D tricked out and a friend's SD something) is bunched to the left, and has a large dark background, but the whites are still good, so it extends all the way to the right. I could have opened up a little more and blown the whites a tad, but given that it was with an A80 and built-in flash, and I was really only interested in the juxtaposition of the two cameras that wasn't worth trying for.


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TMR ­ Design
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Aug 24, 2006 13:41 as a reply to  @ Jon's post |  #4

Ahhh, that makes sense now. Thank you.


Robert
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Image brightness in A620
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