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| Adjustment layer | a layer to which you can apply color and other adjustments for the purpose of modifying all layers below the layer |
| Automatic correction | a color or tone correction in which Photoshop detects image information and determines the correction levels to apply |
| Brightness | the overall lightness or darkness of an image |
| Color balance | the overall color cast or mixture of colors in an image |
| Contrast | the amount of difference between the darkest and lightest pixels in an image |
| Highlight | a light area in an image where light has bounced off a high spot in the subject or object being photographed |
| Hue | a pixelÕs actual color |
| Levels | feature that enables you to adjust color balance for individual color channels or the whole image by working proportionally with the distribution between pixels |
| Midtones | tone values in an image that fall between highlight and shadow tones |
| Saturation | the amount of a particular hue applied to the pixel |
| Shadow | a dark area in a photo where less light struck the subject or object being photographed |
| Red eye | an image flaw caused by flash bouncing off the retina of a subjectÕs eye when a photo is shot |
| Backlit | refers to an image where the light source was behind the subject |
| Exposure | refers to the amount of light admitted into the camera to strike the film or sensor to record the photo |
| Overexposed | photo where too much light entered the camera yielding a picture with heavy shadows that can obscure detail |
| Photo filter | an additional optical lens or cover added to a camera lens to introduce a tint that compensates for lighting conditions or creates a special effect like a starburst |
| Underexposed | photo where too little light entered the camera giving the picture a flat dull slightly dark appearance |
