Tuesday, October 6, 2015

Photography Definitions:

Pixels- A minute area of illumination on a display screen, one of many from which an image is composed.

Image Resolution- Is the detail an image holds. Higher resolution means more image detail.

Megabyte- Unit of information equal to 220 bytes or, loosely, one million bytes.

Megapixel- A unit of graphic resolution equivalent to one million or (strictly) 1,048,576 (220) pixels.

Gigabyte- A unit of information equal to one billion (109) or, strictly, 230 bytes.

Jpeg- A format for compressing image files.

Raw- A camera raw image file contains minimally processed data from the image sensor of either a digital camera, image scanner, or motion picture film scanner.

TIFF-  TIFF is a computer file format for storing raster graphics images, popular among graphic artists, the publishing industry, and both amateur and professional photographers in general.

PNG- Portable Network Graphics is a file format for image compression that, in time, is expected to replace the Graphics Interchange Format (GIF) that is widely used on today's Internet.

White Balance- White balance is a camera setting that adjusts for lighting in order to make white objects appear white in photos.

Histogram- A histogram is a graphical representation of the pixels exposed in your image.

Aperture- Is the unit of measurement that defines the size of the opening in the lens that can be adjusted to control the amount of light reaching the film or digital sensor.

Shutter Speed- Shutter speed, also known as “exposure time”, stands for the length of time a camera shutter is open to expose light into the camera sensor.

Depth of field- The distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image.

Aperture Priority- Allows the user to choose a specific aperture value while the camera selects a shutter speed to match, thereby ensuring proper exposure.

Shutter Priority- Of or relating to a semiautomatic exposure system in which the photographer presets the shutter speed and the camera selects the aperture.

Bitmap-  A set of bits that represents a graphic image, with each bit or group of bits corresponding to a pixel in the image.

Exposure- The unit of measurement for the total amount of light permitted to reach the electronic sensor during the process of taking a photograph.

Watermarking- a figure or design impressed in some paper during manufacture, visible when the paper is held to the light.

Optical zoom- Changing the focal length of a camera by adjusting the physical zoom lens.

Digital zoom- Digital zoom is a function of a digital camera used to make the image seem more close-up.

Bracketing- the general technique of taking several shots of the same subject using different camera settings.

Light Meter- Includes a computer, either digital or analog, which allows the photographer to determine which shutter speed and f-number should be selected for an optimum exposure.

Image Stabilization- Also known as vibration reduction and anti-shake, is a technology that helps prevent digital photos from becoming blurred.

Noise- random (not present in the object imaged) variation of brightness or color information in images, and is usually an aspect of electronic noise.

Lag Time- Lag time is simply the time between when you press the shutter button and when the camera actually takes the photo.

Hot Shoe- A hot shoe is a mounting point on the top of a camera to attach a flash unit and other compatible accessories.

Fisheye- A hemispherical plano-convex lens for photographing in a full 180° in all directions in front of the camera.

Macro- Extreme close-up photography, usually of very small subjects, in which the size of the subject in the photograph is greater than life size.

Telephoto- A lens constructed so as to produce a relatively large image with a focal length shorter than that required by an ordinary lens.

Wide Angle- Of or relating to a lens having a relatively wide angle of view, generally 45° or more, and a focal length of less than 50 mm.

DSLR- a digital camera combining the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.

Dynamic Range- Dynamic range in photography describes the ratio between the maximum and minimum measurable light intensities (white and black, respectively).

Digital Negative- An imaging specification that provides for long-term storage of digital photographs generated in multiple proprietary formats.

Exposure Compensation-  A technique for adjusting the exposure indicated by a photographic exposure meter, in consideration of factors that may cause the indicated exposure to result in a less-than-optimal image.

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