Haze

Atmospheric condition characterized by fine particles of dust, smoke or moisture in the air, causing loss of contrast in an image because of light scattering.

High Eye point

Applied to a viewfinder that allows a user to see the entire frame in the viewfinder from a close distance from the eyepiece, for eyeglass-wearing photographers.

High Key

High contrast with mostly highlights and little shadow detail.

Highlights

The bright to white parts of an image.

Histogram

A representation of a frequency distribution by means of rectangles whose widths represent class intervals and whose areas are proportional to the corresponding frequencies. A graph defining the contrast and dynamic range of an image.

Hot Shoe

Accessory holder usually built on top of the camera to mount a flash. It has the necessary electric contacts to communicate with a dedicated speedlight.

Hue Color.

Gradation of color. Also, 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.

Hyperfocal Distance

The closest point at which a camera can be focused where the depth of field includes infinity, starting at half the hyperfocal distance.