Digital Imaging Vocabulary Study Guide
2011 - 12
Aperture
The size of the lens opening which is measured in f-stops.
Aspect Ratio
The ratio of the width of an image to its height.
Background
The scene behind the subject in a photograph
BackLight
Lighting in a photograph that comes from behind the subject.
Blending Mode
How two Layers are blended into each other in Photoshop.
Blooming
Streaks or halos around bright areas of an image that are caused by gross overexposure.
Bracketing
to shoot frames at exposure levels above and below the correct exposure.
Burst Mode
Burst mode is a camera feature that allows you to take a set amount of pictures in a short time.
Canvas Size
The height and width dimensions of the area in which your image is created.
CF Card
A popular card that uses flash memory to store data in a very small card.
Close-Up
A shot in which the subject is tightly framed and shown at a relatively large scale.
CMOS
One of the two main image capture devices found in digital cameras
CYMK
A color model based on cyan, magenta, yellow, and "key" (or black).
COLOR
The sensation by the effect of light waves striking the retina of the eye.
Color Balance
Balancing the color in a photograph based on the type of light in a scene.
Color Select
A way to select or isolate one single color in an image.
Color Temperature
A term used to describe the overall color of an image, whether ‘warm’ or ‘cold.’
Composition
The placement or arrangement of visual elements in a work of art or a photo.
Compression
Reducing the file size and quality of an image to an acceptable level.
Contact Sheet
A collection of multiple small images printed on a single sheet for proofing.
Contrast
The relative difference between the light and dark areas of an image.
Crop
To cut out or trim unneeded portions of an image using.
Curves
A function found in photo editing software that adjusts the tone of an image.
Depth of Field
The distance in front of and behind the subject that is in focus.
Defuse
A term used to soften or spread light with umbrellas, soft-boxes or other ‘modifyers.’
Digital Zoom
Using a lens to digitally zoom in or magnify a scene, usually with a low of resolution.
Digital Single-Lens Reflex
A DSLR camera uses a system of mirrors to look directly through interchangeable lenses.
Exposure
Exposure is how the camera adjusts the shutter speed and aperture to ensure the right amount of light reaches the sensor.
F-stop
The measurement of the aperture setting in a camera lens.
Feather
Softening the edge of a selection by making it gradually fade out until it becomes transparent.
File Compression
 The compression of data in a file, usually to reduce file size.
File Type
Type to enter text
The kind of data stored in a file.
Filter
A particular effect that can be applied to an image or part of an image.
Fisheye
A very wide angle lens with a field of vision covering up to 180 degrees.
Flash
A device that produces a short ‘flash’ of light to help illuminate a scene.
Focal Length
The distance between the center of a lens or mirror and its focus.
Foreground
The part of a scene in front of the main subject.
Full Bleed
When any image or element on a page extends to the end of the page.
Gigabyte
A measure of storage capacity equal to 1 billion bytes.
Gradient
Rate of change in density with exposure, pixel intensity, and image processing.
Gray Scale
A range of gray shades from white to black.
High Dynamic Range
HDR is an increase in the range between the lightest and darkest areas of an image.
Histogram
A graphic representation showing how possible levels of brightness are distributed in an image.
Hot Light
Traditional tungsten lights that are always on at full power.
Hot Shoe
A bracket on a camera body that provides support for a flash attachment.
Hue
The name of any color as found in its pure state in the spectrum.
Image Sensor
A device that converts an optical image to an electric signal.
Image Size
The actual size of the image and not the printable canvas size.
ISO
The sensitivity of the image sensor to light.
Joint Photographic Experts Group
A standard file format for the compression of digital color images.
Key Light
The main light that illuminates the subject.
Layer
Images or effects overlaid on top of one another.
LCD Screen
A flat screen available on digital cameras which displays an image using liquid crystal molecules.
Levels
A tool that adjusts the brightness levels of a photo using three main components: a black point, white point and midtone.
Light Meter
A device used to measure the amount of light and determine the proper exposure for a photograph.
Macro
A close-up photograph, usually of a small object.
Main light
The primary light source illuminating the subject (also known as Key Light).
Mask
A simple way to hide parts of a layer.
Megapixel
A unit of image sensing capacity in a digital camera.
Noise
Colored dots or specks in an image caused by high ISO or low light.
Optical Zoom
A lens that magnifies the subject before recording the image on a digital sensor.
Overexposure
An image that appears too light because of too much light reaching the sensor.
Panning
Horizontal movement or rotation of a still camera or video camera.
Perspective
The relationship of objects in a photograph.
Photoshop
An image manipulation program developed by Adobe Systems, Inc.
Pixel
The smallest unit of a raster image.
Pixelization
Visible pixels in a digital image.
Portable Network Graphics
A compressed image file format similar to jpeg, maintaining transparency.
Post-Processing
Editing an image with software after the initial photography.
Prefocus
Setting the focus of the lens to a point in the scene where you expect the action to take place.
Prime Lens
A lens whose focal length is fixed.
Photoshop Document
The native file format created in Photoshop.
Raster Graphic
A pixel based graphic with a fixed resolution.
RAW
An uncompressed file captured from a digital camera.
Resolution
The number of pixels in an image.
RGB
The color range for computers made of red, green, and blue light.
Rule Of Thirds
Dividing the frame into 9 imaginary sections inorder to create reference points to anchor the subject.
Saturation
The strength of a color in an image.
Scanner
A device that captures images from prints for computer editing and display.
SD Card
A small flash memory card designed to provide highcapacity memory in a small size.
Selection
An area of the image that is ‘selected’ to manipulate in software.
Shape
Areas which define objects in a space.
Shutter
A mechanical device for opening and closing the aperture of a lens during exposure.
Shutter Priority
A camera setting where you set the shutter speed and the camera determines the aperture.
Shutter Speed
The effective length of time a camera’s shutter is open during an exposure.
Strobe
A light source that discharges a controllable amount of light.
Telephoto Lens
A lens that has a narrow angle of view and long focal length.
Texture
The surface detail of objects with in a photograph.
Thumbnail
A small image representing a larger graphic, document, or image.
Tagged Image File Format
An image file format with less compresion then png or jpeg.
Tilt-Shift
Using lenses or layer masks to manipulate the focal area.
Tone
The degree of lightness or darkness in an image or print.
Through the Lens
TTL metering is a cameras capability of measuring light levels in a scene through their lenses.
Underexposure
Inadequate exsposure to light causing the image to be too dark.
Value
The degree of lightness or darkness in a photograph.
Vector Graphic
An image created as lines rather then pixels that can be scaled w/out loss of resolution.
View Finder
What a photographer looks through to compose, and in many cases to focus a photograph.
Vignette
An image with an edge that gradually fades to black or white.
White Balance
The ability to adjust colors based on white as a reference color.
Wide Angle Lens
A lens with a short focal length and a large angle of view.
Wide Angle Lens
A lens with a short focal length and wide angle of view.
Zoom
To enlarge part of an image or scene.
Zoom Lens
A lens with a variable focal length.