by ʇolɐǝz ǝɥʇ qoq

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While there may not be a "right" answer to this question, there are "correct" answers. A histogram is a powerful tool, and when you understand how to use it effectively, it can greatly help your photography. As you mentioned, a histogram is a representation of tonal range and distribution in a photo. The basic mechanics are as such: A histogram represents ...


For myself the easiest way to understand UniWB was the following. Most current digital cameras have twice as much green light sensors as they have reds and blues (referenced as RGBG). Now to achieve neutral gray by changing white balance, usually the red and blue channels need to be amplified more than green. Just a few examples (for Canon 350D): Tungsten:...


To add to jrista's excellent answer, an histogram is god-send in bright situations where your LCD is very hard to read (eg: at noon in a field of snow, for example).


In the old fashioned darkroom we had a tool called the densitometer. It measured the density (how much light is blocked when you shine a light through) of the negative or slide. It was a bulky and expensive device, and of course it required the film to be developed so it wasn't very practical for use in the field. But we could use it in testing to ...


Most camera bodies (afiak) that display an image histogram, presents a histogram that is based on the JPEG representation of the RAW data captured by the camera sensor. If you do your post processing work with RAW images (and you should ;) ), and you use the camera's histogram display as a guide when taking pictures, then the discrepancy between the ...


I'm not a technical photographer and never made much use of the histograms that I've been seeing for the last 5 or 6 years, until this summer. I went to Israel with family this summer, and as the goal of the group was to see a lot of sites, not to be in various places with ideal photographic lighting, I took a lot of photos in midday sun. To make matters ...


The basic thing I use it for is telling at a quick glance if there is enough light. If the histogram is all on the left, it is too dark and at best you will need to do some post-processing tweaks to get a usable photo. If it is all to the right, it will probably be washed out. Note that you can recover somewhat from both of these in post-processing, but you ...


As Alan says, it's a way to get an in-camera histogram that more accurately represents the raw capture. So, the times when you would use it are when you are unsatisfied with the histograms you're getting. The very long and detailed explanation from Guillermo Luijk is here:


When you look at a picture, it can be hard to tell exactly how well the shadows and highlights fill up the range, especially if you are looking at the picture in the display of the camera. The histogram gives you an exact measure for how the image is exposed.

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