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Thread: Histograms

  1. #1
    Join Date
    Jan 2005
    Location
    Surrey, England
    Posts
    3,210

    Histograms

    Well - I have waited long enough and I still don't really know
    Can anyone explain practically how you use a Histogram - to me it is a meaningless graph of spikes. I would guess one end is the shadow and the other the highlight - but still when I look at them they don't relay anything that tells me anything usefull.
    Sorry to sound stupid - I'm not..Honest!!

    Geoff
    Geoff Chandler. UK/England/Surrey
    NIKON D90 / D80. Nikon 16 - 85 VR, Tamron 28-200,
    Sigma 70-300APO, Tokina 100 AT-X Pro D.
    SB600 flash. Panasonic DMC-TZ25

    http://geof777.multiply.com

  2. #2
    Join Date
    May 2005
    Location
    Silicon Valley, CA, USA
    Posts
    161
    For starters, histograms can serve as an indication of whether an image is correctly exposed. If the histogram appears to be "piled up" at one end of the graph or the other, chances are good that a different exposure would yield a better image. Of course this isn't terribly useful if the image is a silhouette, or otherwise deliberately over/underexposed for effect.

    The histogram is most useful when you are going to print an image. Printers inherently offer less of a dynamic range than CRTs or LCDs, especially with low-cost papers, so you have to make the most of it. Dark shadows tend to "plug up" and highlights go white, losing detail in either case. So you want to stay away from the extremes and go for a range across the middle of the histogram as much as practical. Again, if the image in question doesn't need shadow or highlight detail, this may not matter.

    For detailed explanations of what the histogram can tell you, I highly recommend the "Professional Photoshop" books by Dan Margulis. It seems Dan comes up with a new edition for each release of Photoshop, but the earlier editions are worth keeping and re-reading. I swear his books improved my photography at least as much as the $$$$ I spent on SLRs, lenses, and film.
    A manual-focus slide shooter lost in the world of digicams.

  3. #3
    Join Date
    May 2005
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    27

  4. #4
    Join Date
    Apr 2005
    Location
    Near St. Louis
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    I didn't check out the previous link but here is another on for you that sums it up rather nicely with photographic examples...
    Histograms
    Nikon D90 | Sigma 10-20 HSM | DX 18-105 f3.5-5.6 VR | DX 55-200 VR | 35 f/2.0 D | 50 f/1.4 D | 85mm F/1.8 D | SB-800 x 3 | SU-800
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  5. #5
    Join Date
    Feb 2005
    Location
    Derbyshire, UK
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    Geoff that is a question that has been going round in my mind too. I felt exactly as you did & I'm sure a lot of people will get help from this thread. Thanks guys for the replies just enough information to convince me for one to have a go. It sounds like familiarity & practice are the key as always. I just hope the family don't get too frustrated with the extended time it will no doubt take to take photographs as I get used to histograms.

  6. #6
    Join Date
    May 2005
    Posts
    27
    Phill D, you will be surprised once you get used to it how you ever survived without it before.

    I shoot in M mode on my P&S and just go by the histogram. I have learned not to trust what you see on the LCD's since no two are the same.

    Good luck in your venture you will enjoy it!
    David

  7. #7
    Join Date
    Sep 2004
    Posts
    148
    I believe this site also has a good tutorial regarding histogram use:

    www.luminous-landscape.com

    It should be under the "Understanding series" button.

  8. #8
    Join Date
    Apr 2005
    Location
    Georgia Coast
    Posts
    99
    Quote Originally Posted by Fred
    I believe this site also has a good tutorial regarding histogram use:

    www.luminous-landscape.com

    It should be under the "Understanding series" button.
    Fred,
    Thanks for reminding us about this web site.
    I had the same question a few weeks ago and found this article to be very useful. The entire series is great, easy to understand and very applicable.
    Stacy
    Rebel XT
    Memories may fade from my mind, but a good photograph will speak forever.

  9. #9
    Join Date
    Sep 2004
    Posts
    148
    You're welcome, Stacy. I agree that this site has some very useful information. When I'm stuck with something, I try to remember to go there to see if anything applies.

  10. #10
    Join Date
    Nov 2004
    Location
    Singapore
    Posts
    1,099
    Hi Geoff,

    It's great that you asked - I've just written a short article on how to interpret and use your digital camera's histogram.

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