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| Pixels Per Inch (ppi) or Pixels Per Centimeter | The new image size can be set in pixels, inches, or centimeters, among others. You can set the width and height independently. When setting the resolution of an image, you specify the number opf pixels per inch or pixels percentimeter, that are printed on a page. |
| Color Mode or Color Method | Determines the number of colors and combinations of colors used to display and print the image. Includes RGB, CMYK, LAB, Indexed, and Grayscale, among others. |
| Color Model or Color Space | Each color mode uses a numerical method called a color model, or color space to discribe the color. |
| RGB or 24-bit color | (Red, Green, Blue) is considered an additive color mode because its colors are created by adding together different wavelengths of light in various intensities. Also called 24-bit color, RGB color mode is used typically for images that are reproduced on monitors, projectors, slides, transparencies, and the Web. |
| CMYK or Four-Color Process | (Cyan, Magenta, Yellow, Black) is considered a subtractive color mode because its colors are created when light strikes an object or image and the wavelengths are absorbed. Also called the four-color process, the CMYK color mode is used by most desktop printers and commercial printing businesses. |
| Gamut or color gamut | Is the range of colors that can be displayed or printed. |
| Out of Gamut | Because the gamut of color that can be reproduced with ink is smaller than what we see with our eyes, any color that cannot be printed is referred to as out of gamut. |
| Bit Depth, Pixel Depth or Color Depth | Also called pixel depth or color depth, measures how much color information is available for displaying or printing each pixel in an image. |
| Bit | Stands for binary light. A bit depth of eight means that Photoshop assigns eight binary settings for each color. |
| Color Management System (CMS) | Translates colors from the color space of one device into a device-independent color spac.e |
| Color Mapping or Gamut Mapping | The process of translating colors from the color space of one devices into a device-independent color space. |
| Color Panel | Displays numeric color values for the current foreground and background colors. |
| Foreground color | Used to paint and fill selections and create text. |
| Background color | Commonly is used with fills and masks |
| Gradient or Gradient Fill | A graphic effect consisting of a smooth blend, change, or transition from one color to another. |
| Solid Gradient | Creates a solid color spectrum transition through the gradient. |
| Noise Gradient | Contains randomly distributed color specks within the range of colors that you specify. |
| Smoothness setting | A percentage determining the smoothness of the transition between color bands. |
| Eyedropper Tool | Samples an existing color in a graphic or panel to assign a new foreground or background color. |
| Stroke | An outline on the current layer using a color, gradient, or pattern. |
