Digital Photography Glossary
Photography Glossary - U
Understand the terminology of digital photography, digital printing and digital imaging so that you will become a better photographer. Photographic terms such as Ultraviolet, Umbrella, Underexposure, Unsharp Mask, and more.
Ultraviolet (UV) is light along the color spectrum that is beyond the visible blues. UV light has short (high energy) wavelengths, as opposed to infra-red (IR) light which has long wavelengths, and is also invisible to the human eye. Only certain cameras can "read" the lowest end of the UV light wavelength.
An Umbrella is a lighting unit accessory that fits on the lighting unit and reflects the light back onto the subject. An umbrella reduces the intensity of a light source without changing the dynamics of the light.
Click here to learn more: How to Use Lamp Reflectors in Photography
Underexposure occurs when the image sensor (or film frame) did not receive enough exposure time from the light source, such that the subject doesn't register effectively and is usually surrounded in shadows with limited shadow detail.
Click here to learn more: Undestanding Exposure - ISO, Aperture and Shutter Speed Explained
Unsharp Mask is a filter in Adobe Photoshop (and other image processing software) that enables one to adjust the amount of overall sharpness in a digital image.
Click here to learn more: Image Sharpening