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P021
P021 Digital Imaging Fundations
| Term | Definition |
|---|---|
| BITMAP | A graphic image that consists of a GRID of tiny squares used for continuous tone photographs. |
| PIXEL | A single point in a bitmap image, the smallest portion of an image that can be displayed or printed. |
| RASTER | Another term for BITMAP image. |
| VECTOR FILL | A fill is a color, pattern, or gradient inside an object or shape in a vector image. |
| VECTOR IMAGE | Images that are drawn with lines (paths) curves and points based on math equations. |
| VECTOR OUTLINE | Strokes, or drawn lines, shapes and paths which make up the skeleton upon which the vector image is made. |
| COLOR BIT DEPTH | The measure of how much color information is available to display or print each pixel in an image. |
| COLOR CHANNEL | Grayscale layers of an image that act as a color filter for each primary color in the image. |
| COLOR MODE | The Photoshop setting that determines the colors used to display or print an image. |
| COLOR SPACE | A map of all the available colors (gamut) on a particular device. |
| DUOTONE | A process that uses two contrasting colors for highlights and middle tones in a grayscale image. |
| GAMUT | The complete set of colors that can be reproduced in a color mode. |
| OUT OF GAMUT | When certain colors cannot be reproduced within a particular color mode. |
| SEPIA TONE | A duotone with a brownish tone and black effect seen in photos from the original 19th and 20th century. |
| ALPHA CHANNEL | An embedded color channel used for saving selections as a mask to create a transparent area allowing composite images. |
| COMPRESSION ARTIFACTS | Distortions such as small dots or halos around high-contrast edges in an image caused by excessive compression. |
| FILE FORMAT | A particular method to encode digital information for storage in a computer file. |
| IMAGE FILE COMPRESSION Is | a method of using math algorithms to decrease storage size and download speed on high resolution image files. |
| LOSSLESS COMPRESSION | A compression method that reduces file size with no loss in image quality, although compression ratios are generally weak. |
| LOSSY COMPRESSION | A compression method that takes advantage of the limitations of the human eye and discards information that cannot be seen. |
| TRANSPARENCY | An image that has an invisible background around it allowing a foreground object to show without a rectangle area surrounding it. |
| IMAGE RESOLUTION | The number of pixels packed into a linear inch of a printed image. |
| IMAGE SIZE | Describes the width and height of an image in pixels, and the total pixel count. |
| PPI - PIXELS PER INCH | A measurement of the pixel density of computer displays, and digital cameras. |
| SPI- SAMPLES PER INCH | A measurement of the resoluation of an image scanner. |
| DPI - DOTS PER INCH | A measure of the resolution of a printer. |
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