Drag these sliders to the edge of the histogram. This action allows you to set a new Black and White Point. Usually, it also creates a nice contrast. TIP: Hold down the Alt key while doing this to see at what point you lose information in the highlights or shadows. Select the white eyedropper to let Photoshop know which area in the photo should be true white.
You can do the same with the black. The grey eyedropper allows you to set a grey point. Or, even more straightforward, use the Auto button, and Photoshop will set the Levels for you. There are two ways to adjust the Levels tool in Photoshop. Add a Levels adjustment layer in the Layers Panel. By matching levels in Photoshop, you adjust the brightness of two photos so that they look the same.
You can do this with Levels or Curves. With Photoshop Curves, you decide what range of tones you change, whereas Levels only allows you to change all tonal values proportionally. In the Levels function, zero represents black and if you have pixels that are at zero, that means there is no detail, they are totally black.
The right hand side at represents total white. If you have pixels at that means they are totally white, with no detail. If the shape of your histogram is leaning to the left hand side, that means you have a lot of dark pixels in your image and your image is possibly underexposed.
If the histogram is more on the right hand side that means you have a lot of bright highlights in your image and it is possibly overexposed. The middle slider is the mid-tone or gamma adjustment. All the pixels that are not highlights or shadows, fall into this category. When you open the Levels tool, very often your first instinct is to push the sliders into a position that makes the image look brighter.
That can work, but I suggest that you do the following: Before you make any adjustments, take a look at your image and see if you can pick up a colour cast. This is a tint or colour that affects the whole image, and is often unwanted. For example, if you have a wedding photo of a bride shot on an overcast day and while everything looks okay, there may be a slight blue hue in the image from the overcast light. This means that her dress looks a little blue instead of white. In a case like this, a colour cast is something you want to get rid of.
If however you have shot a summer sunset and the whole scene is bathed in warm orange light, this could also be seen as a colour cast, but in that case you would probably not want change it. One way to find colour casts in your images is to look at an area of the image that should be white and see if it has a tint. A colour cast will vary depending on the light you shot under; it could be green, magenta, blue, yellow, orange, or anything in between.
You can use the Levels tool on any image that needs the colour or contrast corrected. If you have an image that needs to have the colour cast corrected, like my shot of the Star Wars Stormtrooper does, then do the following:. If your image has a colour cast the example image does, as there is a slight blue colour because it was overcast weather that day , follow these steps.
If you do have a colour cast in your image, then do the following:. Bring the white and black sliders to the point where the graph starts moving upward. He enjoys reading Fstoppers. He yearns to be a Civil War buff but has yet to finish the Ken Burns series.
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