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Ag Com Chapter 9
Ag Com Chapter 9 Digital Photography and Photographic Editing
| Term | Definition |
|---|---|
| Photography | literally means "drawing or writing with light"; a process of creating images |
| Pixel | picture element |
| Megapixel | one million pixels |
| Pixels per inch | measure of an image's resolution |
| JPG | file format developed by the Joint Photographic experts Group; all Web browsers and e-mail programs can display a JPG image. JPGs are smaller in file size than other formats. |
| TIFF | stands for tagged image file format. These files are much larger the JPGs because TIFFs do not compress files very much. cannot be displayed on some Web browsers. |
| Raw | file format specified by each camera manufacturer; records data straight from the camera's sensor, just the way it looks on the sensor, onto the camera's data card. The files are uncompressed, meaning they are larger than JPG files. |
| ISO | stands for International Standards Organization; scale for measuring light sensitivity |
| Color temperature | different color qualities of light; light sources contain different amounts of red, green and blue light |
| White balance | tells the camera what combination of red, green, and blue light it should perceive as white, given a particular lighting condition |
| Composition | organizing the subject - the person or object of the photograph- through the viewfinder of the camera |
| Rule of thirds | basic principle of video and photographic composition in which you imagine dividing an image into thirds horizontally and vertically so that you have nine parts ;you position the main subject elements where the diving lines intersect |
| Depth of field | the portion of the scene in focus in the camera; can be long or short |
| Aperture | the "iris" of the camera; the opening in the lens through which light passes to the camera sensor. controls the amount of light allowed into the camera |
| Caption | provides written information underneath a photograph that is necessary for the reader to understand the photograph; also known as a cutline |
| Resolution | a measurement of how closely packed together the pixels are in an image; usually measured as pixels per inch |
| Resampling | changing a picture's pixel dimensions by adding or subtracting pixels from an original image |
| RGB | stands for "red, green, blue"; the color format used by televisions and computer monitors. If a photograph's final destination is the Web or a television monitor, the final color format needs to be RGB. |
| CMYK | the inks used for printed documents |
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3turnshome79
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