When you work with an image that has a high resolution, you can readily
see the difference in quality, because the additional pixels make it possible to
reproduce subtle variations in color. An image that measures 10 ?— 8 inches at
a resolution of 300 pixels per inch (ppi) has pixel dimensions of 3000 ?— 2400.
If you lower the resolution while keeping the pixel dimensions constant,
you can print a larger image. However, the image will not be as sharp as the
original was at a higher resolution. For example, if you change the resolution
of an image with pixel dimensions of 3000 ?— 2400 from 300 ppi to 200 ppi, the
resulting print measures 15 ?— 12 inches. The 200 ppi image will not be as sharp
as the 300 ppi image because the pixels are larger.
Figure 1-2: A high-resolution image is comprised of
millions of pixels.
Figure 1-3: Individual pixels are squares of solid color.
1 4 Digital Photography QuickSteps Stepping into Digital Photography
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Q: What are megapixels?
A: A megapixel, the unit of measure for the number of pixels captured by a
digital camera image sensor, is a million pixels. For example, an 8.0-megapixel
camera is capable of creating images with a maximum image size of 3456 ?— 2304
pixels (a total of 7,962,264 pixels).
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