| Hail: |
Precipitation in the form of balls or irregular lumps of ice produced by liquid precipitation, freezing and being coated by layers of ice as it is lifted and cooled in strong updrafts of thunderstorms.. |
| Halo: |
A ring or arc that encircles the sun or moon. Halos are caused by the refraction of light through the ice crystals in cirrus clouds. |
| Hard: |
Defines a scene, negative or print with high contrast. |
| Haze: |
Atmospheric condition caused by fine particles of dust, smoke or moisture in the air. This causes loss of contrast in an image because of light scattering and general degradation of background image quality |
| Heavy: |
A suffix used in RT callsigns to indicate that the aircraft is a large transport, alerting controllers and following aircraft to the possibility of wake turbulence |
| Helicopter Turbine: |
Helicopter with a turbine engine |
| Histogram: |
A graphic representation of the range of tones from dark to light in a photo. Some digital cameras include a histogram feature that enables a precise check on the exposure of the photo. |
| Holding pattern: |
A racetrack-shaped manoeuvre which keeps aircraft within a specified airspace while awaiting further clearance from air traffic control. |
| Hotel: |
Stands for the letter H in the phonetic alphabet. |
| Hovering in Ground Effect: |
In a Helicopter maintaining a fixed position over a spot on the surface that compresses a cushion of high - density air between the main rotor and the surface and thus increases the lift produced by the main rotor. Normally the main rotor must be within o |
| Hovering Out of Ground Effect: |
In a Helicopter maintaining a fixed position over a spot on the surface at some altitude above the surface at which no additional lift is obtained from ground effect. |
| Hue: |
Name of the color (e.g. red, blue, yellow). |
| Hue color.: |
The attribute of colors that permits them to be classed as red, yellow, green, blue, or an intermediate between any contiguous pair of these colors. |
| Humidity: |
The amount of water vapor in the atmosphere. |
| Hyperfocal point: |
Nearest point to the camera which is considered acceptably sharp when the lens is focused on infinity. When a lens is focused on the hyperfocal point, depth of field extends from a distance halfway between this point and the camera to infinity. |
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