What is a Histogram

Histograms are a topic that we could (and probably should) spend a lot of time talking about but let me give you a very brief answer to get you through in the short term.

Histograms are a very useful tool that many cameras offer their users to help them get a quick summary of the tonal range present in any given image.

It graphs the tones in your image from black (on the left) to white (on the right).

The higher the graph at any given point the more pixels of that tone that are present in an image.

So a histogram with lots of dark pixels will be skewed to the left and one with lots of lighter tones will be skewed to the right.

The beauty of a histogram is that the small LCD display on your camera is not really big enough to give you an great review of a picture and you can often get home to find that you’ve over or under exposed an image. Checking the histogram can tell you this while you’re in a position to be able to adjust your settings and take another shot.

Is there such a thing as a ‘good’ histogram?

As with most aspects of photography, beauty is in the eye of the beholder and there’s always a lot of room for personal taste and different ways of expressing yourself as a photographer.

There is no such thing as the ‘perfect’ histogram – different subjects and photographic styles will produce different results. For example taking a silhouette shot might produce a histogram with peaks at both ends of the spectrum and nothing much in the middle of the graph. Taking a shot of someone at the snow will obviously have a histogram with significant peaks on the right hand side…. etc

 Having said this (and to generalize) – in most cases you’ll probably want a fairly balanced shot with a nice spread of tones. Most well exposed shots tend to peak somewhere in the middle and taper off towards the edges.

Using Histograms While Shooting

So now you know what a histogram is – grab your digital camera’s manual and work out how to switch it on in playback mode. This will enable you to see both the picture and the histogram when reviewing shots after taking them.

Keep an eye out for histograms with dramatic spikes to the extreme ends of either side of the spectrum. This indicates that you have a lot of pixels that are either pure black or pure white. While this might be what you’re after remember that those sections of the image probably have very little detail – this is a hint that your image could be either over or under exposed.

The histogram is really just a tool to give you more information about an image and to help you get the effect that you want. Having your camera set to show you histograms during the view process will tell you how your image is exposed. Learning to read them will help you to work out whether you’re exposing a shot as you had hoped.

charlottebell

EDUCATION 2010 Student Tony Corbell. 2011 PPA Photography School, Dallas TX 2010 Student Kirk Tuck, Austin, TX 2000- Marketing consultant for The Rug Hook Project of MX 2004- Organizer of Travis Heights Art Show 2004 Student Dan Burkholder, Platinum printing and digital photography 2004 Student Tom Knapp, printmaking 2004 Student of Lander Rodriguiz, photoshop 2003 Author of “Tears from the Crown of Thorns” 2003 Student of Jo Brenzo Master photographer 2002 Student of Jill Skupin Bromoil photography 2002 Student of Ray Carafano Holga Camera photography 2001 Student of Lisa Mackie, NY, NY Printmaking 2001 Student of Jim Johnston San Miguel de Allende, Mexico Printmaking 1998 Instituto Allende, San Miguel de Allende Photography 1997 Instituto Allende, SMA Photography 1995&96 Elizabeth Ney Sculpture School Sculpture 1996 Boulder Sculpture Academy Sculpture 1995 Daugherty Art Center Photography 1994 Instituto Allende. San Miguel de Allende Photography 1969 University of Minnesota BS Psychology, minor Art

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