Corel Painter 2015 Guide de l'utilisateur télécharger pdf (Page 118)

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• 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 883.

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.

Saving GIF files

Corel Painter lets you save documents as GIF files. GIF, a file format using 8 or fewer bits, is commonly used

to display graphics on the Web. When you save a GIF file, you can choose settings from 4 Colors to 256

Colors. You can choose how your colors will be displayed and what part of your image will be transparent.

You can enable the Color Set option to force all colors in the color table of the GIF file to match the colors

in the current color set. This option can be useful when you are doing Web work, especially if you want to

constrain colors to a specific color set or control the number of colors on a Web page, thus controlling the

image file size.

The Imaging Method setting determines how a 24-bit Corel Painter document will be converted to the

limited number of colors that GIF uses. If you choose Quantize to Nearest Color, Corel Painter may replace

some colors with colors that are located next to each pixel. If you choose Dither Colors, Corel Painter

applies a pattern to the chosen colors to generate a more accurate, less banded result.

Corel Painter can also save a frame stack as a GIF animation file. For more information, see “Exporting

animated GIFs” on page 839.

If you want your image to have transparency, enable the Output Transparency check box. Most programs

that display GIF files support transparency, but for those that don’t, you should specify the color of the

“transparent” area. If your image will be displayed on the Web, enable the Background is WWW Gray

option. You can also choose to use the background color of your Web page by enabling the Background is

BG Color option.

For programs that support transparency, your selection will determine which areas are transparent. The

Threshold slider determines which selection (loaded mask) value becomes transparent. You can see how

the Threshold slider affects the transparency of your image in the Preview window of the dialog box.

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Commentaires sur ces manuels

Chriscof 29 Apr 2024 | 04:09:55

Hello, im noob :)

Corel Painter 2015 Guide de l'utilisateur Page 118

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