Bedienungsanleitung Adobe Photoshop CC - 2015 (Seite 139 von 859) (Englisch)

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Image and color basics

Last updated 11/30/2015

Bitmap images are resolution-dependent—that is, they contain a fixed number of pixels. As a result, they can lose detail

and appear jagged if they are scaled to high magnifications on-screen or if they are printed at a lower resolution than

they were created for.

Bitmap images sometimes require large amounts of storage space, and often need to be compressed to keep file sizes

down when used in certain Creative Suite components. For instance, you compress an image file in its original

application before you import it into a layout.

Note: In Adobe Illustrator, you can create bitmap effects in your artwork using effects and graphic styles.

About vector graphics

Vector graphics (sometimes called vector shapes or vector objects) are made up of lines and curves defined by

mathematical objects called vectors, which describe an image according to its geometric characteristics.

You can freely move or modify vector graphics without losing detail or clarity, because they are resolution-

independent—they maintain crisp edges when resized, printed to a PostScript printer, saved in a PDF file, or imported

into a vector-based graphics application. As a result, vector graphics are the best choice for artwork, such as logos, that

will be used at various sizes and in various output media.

The vector objects you create using the drawing and shape tools in Adobe Creative Suite are examples of vector

graphics. You can use the Copy and Paste commands to duplicate vector graphics between Creative Suite components.

Combining vector graphics and bitmap images

When combining vector graphics and bitmap images in a document, it’s important to remember that how your artwork

looks on-screen isn’t always how it will look in its final medium (whether commercially printed, printed on a desktop

printer, or viewed on the web). The following factors influence the quality of your final artwork:

Transparency Many effects add partially transparent pixels to your artwork. When your artwork contains

transparency, Photoshop performs a process called flattening before printing or exporting. In most cases, the default

flattening process produces excellent results. However, if your artwork contains complex, overlapping areas and you

require high-resolution output, you will probably want to preview the effects of flattening.

Image Resolution The number of pixels per inch (ppi) in a bitmap image. 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 what the

output device can produce) increases the file size without increasing the quality of the printed output, and slows the

printing of the artwork.

Printer resolution and screen frequency The number of ink dots produced per inch (dpi) and the number of lines per

inch (lpi) in a halftone screen. The relationship between image resolution, printer resolution, and screen frequency

determines the quality of detail in the printed image.

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