The image resolution of any graphic
RIDING THE RESOLUTION CAROUSEL
It is inevitable that you will encounter more than one type of resolution. For
example, device resolution refers to the number of dots per inch (dpi) that a
device, such as a printer or monitor, can produce or display. Device resolution on
computer monitor screens can vary from 60 to 120dpi. (Note: Don’t confuse this
with screen resolution, which refers to the number of dpi in the line screen used
to reproduce halftone images.) A 21-inch monitor displays more pixels than a
13-inch model, and some monitors can even display various pixels per inch (ppi).
If you don’t change the magnification level, what you see at 64dpi is simply a
closer look at the same image. Because the pixels are larger it appears to be lower
resolution. Monitor screen resolution, to confuse things further, is also measured
in lines per inch (lpi). This last one is left over from TV.
Image resolution really refers to the amount of information that is stored in
an image file and is often expressed in ppi. The image resolution of any graphic
What’s a pixel? If you look close enough you can see them. This is an extreme close up of that same picture of
Brenda, but when printed even at 13 ? 19 inches or viewed on a large monitor these little digital squares are
impossible to detect—especially when the print is viewed at the “normal viewing distance.” The old rule of
thumb for determining what’s normal is that a print should be viewed from a distance approximately equal to
the diagonal measurement of the print.
image ultimately determines how large a file is. This means that the higher the
resolution, the bigger the file, and size determines how long an image will take
to move, manipulate, store, or print. All this goes back to how many bits, bytes,
kilobytes, and megabytes an image file contains, and completes the circular discussion
of resolution that began with bits.
The bottom line on resolution is that you have to match the resolution of the
image acquisition device and software to the output. Requirements for World
Wide Web applications, because they are based on monitor resolution, are different
from working with four-color magazine-quality output. By understanding
resolution and what it means, you will be in a better position to evaluate equipment
purchases and make the right choices.
* Tips, Tools, and Techniques for Photographers
Joe Farace
?Getting Started with Digital Imaging Tips, Tools and Techniques for Photographers
thank you so much for this info about photography art