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Histograms
I have a D80, & am really enjoying both the camera & learning all I can about digital photography. I've been studying up on Histograms & think I'm getting the hang of it. just 1 question though. What does it mean when your histogram is starting & finishing at the right points, but it doesn't go up very high? As in it is a reasonably low hump? I read something about contrast, but I'm not sure. Does it matter? Does it mean shortcomings in the image? Or does it just reflect the lack of colours in the image?? Any input would be appreciated.............. Thanks............ Pete:)..

Comments (7)

Sneaky1 wrote:.

What doesit mean when your histogram is starting & finishing at the rightpoints, but it doesn't go up very high? As in it is a reasonably lowhump? I read something about contrast, but I'm not sure. Does itmatter? Does it mean shortcomings in the image? Or does it justreflect the lack of colours in the image??.

It's not the 'low hump' that is significant, it's the absence of big peaks. It simply means that there are are no brightness levels which occur especially frequently in the image. So no large areas of uniform green grass, or blue sky, or white dress - it could be characteristic of a more visually complex image maybe. It doesn't mean lack of colours - a brightness (luminance) histogram tells you nothing about how colourful an image is. No, it doesn't mean shortcomings in the image..

At a basic level, the histogram is simply a guide to correct exposure. Beyond that you need to be looking at your image, not the histogram!..

Comment #1

If you are posting a duplicate question in more than one forum, you can also post a link to it..

This way you have one thread but more than one post listing. It keeps things together and posters don't have to repeat the same comments.Just copy and past the url into the link and tell people it is a duplicate.Ed..

Comment #2

Sorry, I posted the first one in Nikon forum but then thought it may be too basic a question for such a forum. My apologies, thanks for telling me the correct way.............Pete....:)..

Comment #3

...in the way they handle the vertical-axis of the histogram chart. The horizontal-axis is a constant (values from 0 on the left to 255 on the right). But the vertical-axis is a count of the number of instances of a specific brightness value. It has no absloute value. It is a relative value. Cameras typically "normalize" the curves somewhat, but how and when they do this is a mystery..

Bottom Line: the height of the curve is not as important as the SHAPE of the curve. Also, not all "good" pix will have a normal distribution of values..

Charlie DavisNikon 5700, Sony R1, Nikon D300HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/'Experience: Discovering that a claw hammer will bend nails.Epiphany: Discovering that a claw hammer is two tools...'..

Comment #4

Take a look at this explaination from The Luminous Landscape:.

Http://www.llvj.com/...ls/understanding-series/understanding-histograms.shtml.

By Michael Reichmann.http://www.llvj.com/about/critic.shtml.

I find his style suits me, some people love him and some (by reading these forums) don't, but I think he's great and I've learnt a lot by reading through his site. Now that I have read just about everything on his site I have simply bookmared his Whats New page and go to that every day or so to see what is new..

Michael is into landscapes mostly, but even though I'm into portrait and people photography, I find the site very useful..

Michael is primarily a Canon user but he has also just added a lot of Nikon lenses to his kit along with I think a Nikon D3 and D300..

Best of luck...

Comment #5

Nztony wrote:.

Take a look at this explaination from The Luminous Landscape:.

Http://www.llvj.com/...ls/understanding-series/understanding-histograms.shtml.

I like that one too. Here's another one to read afterward, slightly more technical but bookmark it and look back at it (and the other turorials on their site) occasionally:.

Http://www.cambridgeincolour.com/tutorials/histograms1.htm..

Comment #6

Thanks mate, thats a good one, more informative than others i've read. Thanx to all............... Pete......:)..

Comment #7

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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