Bedienungsanleitung Adobe PHOTOSHOP ELEMENTS (Seite 55 von 296) (Englisch)

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ADOBE PHOTOSHOP ELEMENTS

User Guide

Image resolution The number of pixels displayed

per unit of printed length in an image, usually

measured in pixels per inch (ppi). In Photoshop

Elements, you can change the resolution of an

image because image resolution and pixel dimen-

sions are interdependent.

The amount of detail in an image depends on its

pixel dimensions, while the image resolution

controls how much space the pixels are printed

over. For example, you can modify an image’s

resolution without changing the actual pixel data

in the image—all you change is the printed size of

the image. However, if you want to maintain the

same output dimensions, changing the image’s

resolution requires a change in the total number

of pixels.

72-ppi and 300-ppi images; inset zoom 200%

When printed, an image with a high resolution

contains more, and therefore smaller, pixels than

an image with a low resolution. For example,

a 1-by-1-inch image with a resolution of 72 ppi

contains a total of 5184 pixels (72 pixels wide x

72 pixels high = 5184). The same 1-by-1-inch

image with a resolution of 300 ppi contains a total

of 90,000 pixels. Higher resolution images usually

reproduce more detail and subtler color transi-

tions than lower resolution images. However,

increasing the resolution of a low-resolution

image only spreads the original pixel information

across a greater number of pixels; it rarely

improves image quality.

Using too low a resolution for a printed image

results in pixelation—output with large, coarse-

looking pixels. Using too high a resolution (pixels

smaller than the output device can produce)

increases the ﬁle size and slows the printing of the

image; furthermore, the device will be unable to

reproduce the extra detail provided by the higher

resolution image.

Monitor resolution The number of pixels or dots

displayed per unit of length on the monitor,

usually measured in dots per inch (dpi). Monitor

resolution depends on the size of the monitor plus

its pixel setting. Most new monitors have a

resolution of about 96 dpi, while older Mac OS

monitors have a resolution of 72 dpi.

Understanding monitor resolution helps explain

why the display size of an image on-screen often

differs from its printed size. Image pixels are trans-

lated directly into monitor pixels. This means that

when the image resolution is higher than the

monitor resolution, the image appears larger

on-screen than its speciﬁed print dimensions.

For example, when you display a 1-by-1 inch,

144-ppi image on a 72-dpi monitor, it appears in a

2-by-2 inch area on-screen. Because the monitor

can display only 72 pixels per inch, it needs

2 inches to display the 144 pixels that make up one

edge of the image.

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