| Hyperlink | A link that allows the viewer of a page to navigate or ‘jump’ to another location on the same page or on a different page |
| Hyper Focal Distance | The distance setting (of a lens) that gives the greatest possible range of distances at which objects appear to be in focus. |
| Hydrophone | Underwater microphone |
| hunting | the lens can continually seek focus, but does not lock on, usually due to low light or insufficient contrast |
| Hue | The name of a color, e.g. red, green or blue |
| HTML | Hyper Text Markup Language. The code that is used to describe the contents and appearance of a web page |
| HSB | This mode uses a color’s hue, saturation, and brightness to define it. Hue is defined by its location on the color wheel and is |
| HQ | High-quality |
| Housing | A casing or box with waterproof seals designed to contain a camera or other equipment in such a way that it can be used underwater. |
| HotShoe | A camera accessory shoe with electrical connections for a flash unit on top of a camera. |
| Hosepiping | The tendency to make unnecessary movements |
| hosepipe | shoot everything in sight! |
| History Palette | Shows the list of steps taken to create the image that you are currently working on. The History palette helps you correct errors (by storing what you’ve done to a file previously) and allows you to return to a point before a particular edit was made simply by clicking on the appropriate step. |
| History Brush | A tool in Photoshop with which a previous state or history can be painted |
| Histogram | A graph of brightness along the horizontal axis (black to white) and the number of pixels at each brightness level on the vertical axis. |
| Highlight | Area of subject receiving highest exposure value |
| High Dynamic Range | A picture type that is capable of storing 32 bits per color channel. This produces a photo with a much bigger possible brightness range than found in 16 –or 18-bit per channel photos. Photoshop creates HDR images with the merge to HDR feature |
| HID | High intensity discharge lights |
| Hi8 | Highband Video 8 |
| Hertz | Hertz is the unit of frequency, and is synonymous with 'cycles per second' (c/s). |
| Helical Scanning | All modern videotape recorders use helical scanning, and the technique is also used to write CDquality audio on to tape in DAT (digital audiotape) machines. |
| healing brush | this tool lets you correct imperfections, causing them to disappear into the surrounding image. |
| Headroom | The space between the top of the subject and the top of the picture |
| HDR | High Dynamic Range image |
| Halftoning | To create the illusion of continuous tones when printed, images are broken down into a series of dots. This process is called halftoning. Varying the sizes of the dots in a halftone screen creates the optical illusion of variations of gray or continuous color in the image. |
| Halftones | Halftones are dots of a specific shape, such as an ellipse or a circle. Halftones dictate how much of each color goes on the material at press time. Varying how large or small the dots are determines the actual color printed |
| Halftone Pattern | Simulates the effect of a halftone screen while maintaining the continuous range of tones. |
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