What is a histogram tool and how can you use it to improve photos?

the histogram is one of the most important and valuable tools that Photoshop gives us when editing, retouching or restoring images is . Due to their value histograms are not limited to  Photoshop. They can be found in lots of other image editing programs as well.   Some of the newer Digital cameras  also come with a  histogram feature that lets you view the exposure of your photos right after you snap them .  It is amazing that for how simple this tool is how anyone would not want to use it to improve their quality of photographs.  So what exactly is a histogram?  A histogram is simply a graph. That may sound boring and you might think how is a graph going to help me with my photo’s, but don’t worry, this is easy stuff. A histogram is a graph that shows us the current tonal range of our image.  “Tonal range”, just means how the  bright values of the image are. A histogram shows  how much of the image is currently pure black (the darkest an image can be), how much of it is currently pure white (the brightest an image can be), and how much of it falls somewhere between black and white. Don’t confuse “black and white” with black and white images (there is a difference), but they work  well with full color photos too since you are dealing with brightness values, not colors

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