User Tag List

Thanks useful information Thanks useful information:  11
Results 1 to 7 of 7

Thread: interpretting the graphs

  1. #1
    Member
    Join Date
    27 Jan 2011
    Location
    north west
    Posts
    113
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    interpretting the graphs

    when reviewing photos through the lcd screen, if you hit the info buttton (canon) there are 3 graphs that pop up, one in blue, red and green, also another graph. can someone tell me how to interpret these graphs, and what exactly i should be looking for.

  2. #2
    Member
    Join Date
    12 Feb 2008
    Location
    Brisbane
    Posts
    7,831
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    what you are looking at there are called histrograms (just look that up on wikipedia) but what they are basically showing you is how the particular colour channel is spread from underexposure (left side) through to overexposure (right side)

    They are quite important to understand as it they can really help you understand how you are exposing and capturing all the colours and tonal range of any particular scene.
    Darren
    Gear : Nikon Goodness
    Website : http://www.peakactionimages.com
    Please support Precious Hearts
    Constructive Critique of my images always appreciated

  3. #3
    Member
    Threadstarter

    Join Date
    27 Jan 2011
    Location
    north west
    Posts
    113
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ok so i wikipedia'd histogram, and it didnt really help much, but i found this page on it at http://www.cambridgeincolour.com/tut...istograms1.htm, it is a very comprehensive explanation, and ive learned a lot, so for anyone else asking what exactly those graphs are, check it out.

  4. #4
    Member
    Join Date
    04 Jan 2011
    Location
    Brisbane
    Posts
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks heaps for that link bxaftw. I'm brand spankin new to all of this and I've often wondered the same. That is a really helpful link!

  5. #5
    Member
    Join Date
    14 Feb 2010
    Location
    Leura
    Posts
    136
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    There is loads of infomation a lot of it very technical on histograms.
    Dont get too coaught up in the technicsal bits. Basically, you want a big pile in the middle and a little bit at each end.
    But... dont be afraid to push it off to each end if the subject warrants it, (night, snow).
    Togs are what my son wears to go swimming.

  6. #6
    Administrator ricktas's Avatar
    Join Date
    24 Jun 2007
    Location
    Hobart
    Posts
    15,643
    Mentioned
    10 Post(s)
    Tagged
    1 Thread(s)
    This is probably the easiest tutorial on histograms for beginners, it lets them get their heads around the concept very well : http://www.luminous-landscape.com/tu...stograms.shtml
    "It is one thing to make a picture of what a person looks like, it is another thing to make a portrait of who they are" - Paul Caponigro

    Constructive Critique of my photographs is always appreciated
    Nikon, etc!

    RICK
    My Photography

  7. #7
    Member
    Join Date
    02 Oct 2010
    Location
    Tyabb
    Posts
    191
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the reference to the article on histograms Rick.

    I found it very interesting and comforting in a way.

    As i read the begining, the author used some words such as dynamic range and histogram and this led me to believe that the author would define them and relate it to using the camera, but this did not happen. These are concepts which i have used and taught for about 25years now, but not related to cameras. I also wondered about his first image using a cpl filter with the sun so strongly on the right side of the photo.

    The author's explanation of Dynamic range makes the whole article a bit confusing and their attempt to relate it to more practical matters made me wonder how it related to taking photographs. Could i suggest that anyone reading this starts from the second sentance of 'The histogram'. Afterall that is the heading of the article.

    I am not being negative about this article because I read through the whole article and the experience of the photographer shines through beautifully. His commment that the histogram 'simply shows the way things are' and that he demonstrates some nice photos with skewed histograms to the right and to the left shows that the histogram does not tell you if the photo is good or bad and that maybe? he is not acting on the histogram given the emphasis he places on it in the first part of the article.
    In fact in his 'examples' section, he has turned his attention to the image details as his way of analysing the image and then relating the histogram to what he 'sees'.
    Therefore his analysis in this section goes agaist his argument about the importance of histograms.
    I could keep making editorial comments but I will say the following

    The photographer's experience in taking photos certainly shines through and I wish I could develop his talent for image.
    His consideration of what you want to get out of a photo in terms of exposure is certainly worth considering. 'Hi key', 18% greyscale or other exposures are all valid methods.

    I think the biggest message for a beginer is to look at your photo and see if the image gives you a pleasing feeling. If not, then consider the histogram, composition etc as tools to imporove your image. I wish i could!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •