Terms starting with U
7 terms
Ultraviolet Photography
Motion, Video & Creative Techniques
nm
Photography using ultraviolet light, either reflected from a subject or as induced visible fluorescence.
Umbrella
Lighting & Flash
cm
A collapsible reflective or translucent modifier that spreads light quickly and cheaply over a wide area.
Underexposure
Exposure & Metering
stops (EV)
An exposure that records less light than the scene needs, producing dark, noisy shadows and muddy colour.
Underwater Photography
Genres, Movements & Theory
m (depth)
Photography made beneath the surface of water, using housings and dedicated lighting.
Unsharp Mask
Post-Processing & Retouching
amount, radius, threshold
A sharpening method that subtracts a blurred copy of the image from the original to find and enhance edges.
Sharpened = Original + Amount × (Original − Blurred)
Upscaling
Post-Processing & Retouching
× or MP
Increasing an image's pixel dimensions beyond those captured, either by interpolation or by machine-learning reconstruction.
UV Filter
Optics, Lenses & Filters
A clear filter that blocks ultraviolet light, now used mainly as physical protection for the front element.