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Glossary "H"

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A printed image made up of dots of varying size that give the appearance of a continuous tone image when viewed from an acceptable distance.
Many cameras have a handgrip a part of the camera body which has been shaped to be gripped with a hand. This not only provide a little extra space in the body for batteries to be housed, but often also makes the camera more comfortable to hold. Some cameras have optional grips than can be purchased to improve handling. Buying advice Pick up the camera in the shop to check that it feels good. Ones with bulky grips can make the shutter release position too far away for a small-handed person. Equally, a small grip creates problems for someone with large hands. If the camera isn't comfortable to use, you're more likely to get camera shake.
An image with high contrast and harsh tones.
The part of the computer that stores all the programs and files. Additional hard drives can be added to increase storage space.
Chemical used at the fixing stage to toughen the film's emulsion and make it more resistant to scratches.
Name given to things such as a computer, film scanner, digital back or camera.
Encoded instructions that appear at the beginning of a digital file to let the computer know the specifics to follow. An image file will have header info that lets the computer know the file is, for example, a jpeg.
High dynamic range (HDR) processing is a technique achieved using software that takes the best tones from several exposures and combines them in one HDR image. The dynamic range is the range of brightness levels in a recorded scene from the darkest shadows to the brightest highlights. This is typically measured in f/stops and has always been a problem for film users shooting on colour transparency film, especially on films such as Fuji Velvia. The dynamic range is around six f/stops from the brightest to darkest points. And while colour negative and black & white film users have always had a few stops to play with, even at a maximum of around nine stops most photographic systems struggle with high contrasts scenes. Several software programs offer the possibility of combining differently exposed shots to one high dynamic range (HDR) image. Also see "High Dynamic Range explained technique".
A high key image mostly consists of highlights and midtones, is generally bright and even, and delicately toned, often with pastel and/or white shades.
A digital photo that contains enough pixels per inch to suit the media it will be displayed on. If it's only being viewed on a PC monitor 72dpi is fine (although not high resolution) while an image being printed in a magazine has to be 300dpi.
The brightest or lightest parts of a photograph.
A chart with a vertical scale showing the tonal values of a digital photo.
A flicker-free, continuous light source for use with digital cameras that have a scanning exposure system.
A technique that's also known as pull processing because you reduce the developing time of a film that received increased exposure in the camera.
An attachment for studio flash that looks like a honeycomb mesh and is used to obtain a hard lighting effect with distinct shadows.
A company that looks after web site data, and offers data connections to the rest of the Internet, usually from its own secure server computer.
An accessory shoe on a camera that has electrical contacts to trigger and synchronise a flashgun when the camera's shutter fires. More sophisticated cameras have several connection pins for advanced communication between the camera and flash. As well as setting the camera's correct shutter speed, these dedicated pins can also control exposure and focusing modes.
The programming code used to create Web pages that can be written using a simple text processor if you understand the basics of HTML. The web browser translates the code back to text and images. Most web site builders create their pages using a web design program, such as Go Live or Dreamweaver, that writes the code automatically as you lay out the pages.
The colour of the subject.
The distance to the nearest point in the photograph that appears sharp when the lens is focused on infinity.
Common name for a fixing bath that's made with sodium thiosulphite salts which used to be known as hyposulphite of soda.