What is Histogram?
A Histogram shows the tonal range of a photo by showing how pixels are distributed in Shadows (LHS), Midtones (Middle) and Highligts (RHS) areas of an image.
Go to Windows > Histograms
To get to the Histogram Panel if not displaying in Photoshop Interface.
How to Read the Histogram in Photoshop?
A – Over Exposed Image: Most Pixels are concentrated over the Shadow Area of an image i.e. Right Hand Side of the Graph.
B – Properly Exposed Image: Pixels are distributed evenly on all areas of the graph. While editing an image for exposure this should be the ideal look of the Histogram.
A – Under Exposed Image: Most Pixels are concentrated over the Highlight Area of an image i.e. Left Hand Side of the Graph.
Watch the below Free Photoshop Tutorial by Phlearn to Learn – How to Read and Use Histogram Graph in Photoshop
It can be used to correct exposure, Color, and evaluate missing information. This episode explains how to read the histogram and how to fix common issues using ‘Levels’ Adjustment Layers.
How to Use the Histogram in Your Camera
The histogram in Photoshop mirrors the histogram on a modern DSLR. Because a histogram displays Color and Light information, it is very useful for correcting exposure. A common problem photographers Face is over-exposure or under-exposure. An image that is either over-exposed or under-exposed will result in a lack of information in the Highlights or Shadows. Images that are over-exposed are commonly referred to as ‘blown out’.
Looking at the image of an LCD, it can be difficult to properly see the exposure of an image. The Histogram displays exposure information, and when properly used can aid in creating a proper Exposure without ‘blown out’ Highlights or completely black Shadows.
Levels and Histogram
The histogram is a great Tool for understanding Exposure and color in an image, but it won’t change exposure values in an image – that is where ‘Levels’ come in. Levels are used to change the white point, black point and mid-tones of an image.
For instance, if and image doesn’t contain true blacks and the Histogram is shifted to the right, increasing the black Levels in the image will compensate for the lack of blacks and correct the exposure. When adjusting exposure it is always best to use a RAW 16-bit image, rather than an 8-bit Jpeg.
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