Corel Painter X3 Win/Mac, EDU, EN Uživatelská příručka stáhnout pdf (Strana 101)

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78 Corel Painter X3 Getting Started Guide

to the original. However, because the JPEG algorithm takes into account the sensitivity

of the eye to different colors, the higher-quality settings should achieve visually

satisfying results.

You can assign a URL to layers and placed images and then save the file in GIF or JPEG

format to produce an image map. For more information, see “Creating image maps” on

page 855.

When you save a file in JPEG format, Corel Painter displays the JPEG Encoding

Quality dialog box, with the following options:

•The Quality options — Excellent, High, Good, and Fair — let you set the degree

of file compression.

The Excellent option compresses the least, but retains the most data. Fair

compresses the most, but loses the most data.

You can also use the Quality slider to adjust file compression.

•The Smoothness slider applies smoothing to the entire image. This is useful when

using the Fair option to blur the edges of JPEG artifacts. The default is 0. Keep in

mind that using a high smoothness setting can cause blurring.

•The Progressive JPEG check box creates a progressive JPEG file. The progressive

format is useful for files designed for the Web. As the name implies, the progressive

format displays an image in stages — as a series of scans — while the file

downloads. The first scan is a low-quality image; the following scans improve in

quality. This allows the user to see the whole image quickly.

•The HTML Map Options — NCSA Map File, CERN Map File, and Client Side

Map File — let you generate an image map. (NCSA refers to the National Center

for Supercomputing Applications, and CERN refers to the Conseil Europeén pour

la Recherche Nucléaire.) Use the NCSA Map File or CERN Map File option to

generate a server-side image map. Use the Client Side Map File option to generate

a client-side image map.

For more information, see “Creating image maps” on page 855.

It is best not to decompress and recompress a file multiple times. Although JPEG can

compress and discard data that is not visible or obvious, the degradation of the data can

affect the condition of your file.

When a file has lost a significant amount of data, block patterns may appear in areas of

the image. If you try to use the Apply Surface Texture feature on a JPEG file, you may

find that the block patterns become more prominent.

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