Daily Archives: September 5, 2017

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Knowledge and Understanding

Colour Overlay

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What is an Overlay?

In photography terms, an overlay is simply another layer added to your photograph in an editing program like Photoshop. They can be photographed, scanned or even made in a program. Overlays are used for many different reasons, there is no right or wrong way to use an overlay. For example an overlay can be used when creating double exposure shots and they help to create some abstract and surrealistic images.

How to create an overlay?

There are many different ways to create overlays and many different types which could be used. The most basic way, I think, is to insert a shape of some sort and make it any colour of your choice. Place the shape at any part of your picture and adjust the size to fit appropriately, then right click on the shape layer and go to blending options. Then go to blend mode and select the ‘overlay’ mode.

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Exposure Triangle

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The exposure triangle is a common way of associating the three variables that determine the exposure of a photograph, these are: aperture, shutter speed, and ISO. A person must balance all three of these to achieve a desired result as they have a significant impact on how your photos will look and feel. Aperture, affects the depth of field, or how much of an image appears sharp. Shutter speed also affects image sharpness, with slower shutter speeds leading to blurred images and faster shutter speeds resulting in sharper images. The choice of ISO enables you to use the optimum combination of aperture and shutter speed when the amount of light would normally prevent you from doing so. However, increasing the ISO also reduces the quality of your images.

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