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# Understanding resolution digital_cameras

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• The arrow is a link to the last slide, which is a picture of a lily. A portion of the center of the lily is enlarged in the top right corner to show the pixels.
• Question: What happens if the image resolution is higher than the monitor resolution? Answer: You will not be able to view the image at its best qualityQuestion: What if the printer resolution is lower than the image resolution? Answer: Your printed image won’t be the optimum quality. To get the optimum quality you will have to have it printed professionally.
• ### Understanding resolution digital_cameras

1. 1. Understanding Resolution & Digital Cameras Ann Ware Bald Knob High School 1
2. 2. Resolution  Understanding digital cameras requires that we know how resolution works.  Resolution is determined by how many pixels (picture elements) or dpi (dots per inch) are available.  The image you see is simply a grid of small squares or circles filled in with color. The more squares or circles—the sharper the image. 2
3. 3. Measuring Resolution  Resolution is measured by the number of horizontal pixels times the number of vertical pixels ◦ Example: 3072 x 2304 3
4. 4. Megapixels  The quality of a picture is measured by its resolution—how many pixels it has; the current measurement is megapixels  A megapixel is a grid containing one million pixels (one million squares of color)—technically, that is an image with a resolution of 1024x1024 pixels 4
5. 5. Resolution  With computer graphics, there are three different resolutions to consider: ◦ the image’s resolution (pixels) ◦ the monitor’s resolution (pixels) ◦ the printer’s resolution (dpi) 5
6. 6. Image Resolution  The image’s resolution is measured in pixels.  Most cameras allow you to change the resolution before you take the picture.  The higher the resolution—the clearer the image— the bigger the file size. 6
7. 7. Monitor Resolution  Monitor resolution is measured in horizontal and vertical pixels ◦ Example: 800 x 600  If an image is taken at 1024x768, but your monitor can only display 800x600—that’s as good as it gets! 7
8. 8. Printer Resolution  Printer resolution is measured in dpi—dots per inch.  The quality of the printed image is going to be determined by both the resolution of the image AND the resolution of the printer. 8
9. 9. Other points to consider  When purchasing a camera, you should also research the following specifications: ◦ Storage Capacity ◦ Transferring Images ◦ Power Source ◦ LCD vs. Optical View Finder ◦ Zoom 9
10. 10. Storage Devices  Memory Card  Internal Memory (RAM) 10
11. 11. Storage Capacity  The number of pictures you can take before sending them to your computer is determined by two things: ◦ the resolution of the image ◦ the type of storage 11
12. 12. Transferring Images  Card reader  USB cable  Bluetooth 12
13. 13. Power Source  Regular Batteries  Rechargeable batteries ◦ Alkaline ◦ Nickel-metal hydride (NiMH) ◦ Lithium-ion (Li-Ion)  AC 13
14. 14. LCDs vs ViewFinder  LCD—Pro’s  View Finder—Pro’s ◦ Shows you the exact image  Uses less battery that will be recorded ◦ Easy to view … delete  Easier to see images in images, etc. bright light ◦ Displays menu  LCD—Con’s  View Finder—Con’s ◦ Drains battery—uses ½ life  Shows close approximation of battery of the final image—not the ◦ Difficult to see in bright light real thing  Difficult for some people to see 14
15. 15. Zoom  Optical zoom actually enlarges the image— measured in X ◦ example: 8X—increases an image 8 times  Digital zoom takes a portion of an image an enlarges it electronically; the image loses resolution when the camera enlarges it; also measured in X  Macro allows you to take close-up pictures of objects that are small and enlarge them so they appear larger. 15
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