Adobe 38039927 User Guide - Page 270

Choosing a file type, Optimizing GIF, PNG, TIFF, BMP, and PICT files

Page 270 highlights

ADOBE FIREWORKS CS3 265 User Guide Choosing a file type You should base your choice of file format upon the design and use of your graphic. A graphic's appearance can vary from one format to another, especially when different types of compression are used. In addition, only certain graphic file types are accepted by most web browsers. Still other file types are ideal for print publishing or use in multimedia applications. The following file types are available: GIF , or Graphics Interchange Format, is a popular web graphic format. GIFs contain a maximum of 256 colors. GIFs can also contain a transparent area and multiple frames for animation. Images with areas of solid color compress best when exported as GIFs. A GIF is usually ideal for cartoons, logos, graphics with transparent areas, and animations. JPEG was developed by the Joint Photographic Experts Group specifically for photographic or high-color images. JPEG supports millions of colors (24-bit). The JPEG format is best for scanned photographs, images using textures, images with gradient color transitions, and any images that require more than 256 colors. PNG , or Portable Network Graphic, is a versatile web graphic format. However, not all web browsers can view PNG graphics. A PNG can support up to 32-bit color, can contain transparency or an alpha channel, and can be progressive. PNG is the native file format for Fireworks. However, Fireworks PNG files contain additional application-specific information that is not stored in an exported PNG file or in files created in other applications. WBMP , or Wireless Bitmap, is a graphic format created for mobile computing devices such as cell phones and PDAs. This format is used on Wireless Application Protocol (WAP) pages. WBMP is a 1-bit format, so only two colors are visible: black and white. TIFF , or Tagged Image File Format, is a graphic format used for storing bitmap images. TIFFs are most commonly used in print publishing. Many multimedia applications also accept imported TIFF graphics. BMP , the Microsoft Windows graphic file format, is a common file format used to display bitmap images. BMPs are used primarily on the Windows operating system. Many applications can import BMP images. PICT , developed by Apple Computer, is a graphic file format commonly used on Macintosh operating systems. Most Mac applications are capable of importing PICT images. Optimizing GIF, PNG, TIFF, BMP, and PICT files Each graphic file format in Fireworks has a set of optimization options. For the most part, only the 8-bit file types such as GIF, PNG 8, TIFF 8, BMP 8, and PICT 8 offer a significant amount of optimization control. Note: JPEG files are an exception. For more on JPEG optimization controls, see "Optimizing JPEGs" on page 272. Fireworks optimization settings are similar for all 8-bit graphic file formats. For web file formats such as GIF and PNG, you can also specify the amount of compression you want on the graphic. You can optimize 8-bit file types by adjusting their color palettes. Fewer colors in the palette means fewer colors in the image, resulting in a smaller file size. The drawback to reducing colors is that it can also diminish image quality. As you experiment with different optimization settings, you can use the 2-Up and 4-Up buttons to test and compare a graphic's appearance and estimated file size. For more information on using the document preview buttons, see "Previewing and comparing optimization settings" on page 263. Note: All file types mentioned above (except PICT, which is only supported on the Macintosh version of Fireworks) can be saved in their original formats in Fireworks CS3 from within the "Save As" dialog box. This behavior differs from that in previous versions of Fireworks. For more information, see "Saving documents in other formats" on page 23.

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ADOBE FIREWORKS CS3
User Guide
265
Choosing a file type
You should base your choice of file format upon the design and use of your graphic. A graphic’s appearance can vary
from one format to another, especially when different types of compression are used. In addition, only certain
graphic file types are accepted by most web browsers. Still other file types are ideal for print publishing or use in
multimedia applications.
The following file types are available:
GIF
, or Graphics Interchange Format, is a popular web graphic format. GIFs contain a maximum of 256 colors. GIFs
can also contain a transparent area and multiple frames for animation. Images with areas of solid color compress best
when exported as GIFs. A GIF is usually ideal for cartoons, logos, graphics with transparent areas, and animations.
JPEG
was developed by the Joint Photographic Experts Group specifically for photographic or high-color images.
JPEG supports millions of colors (24-bit). The JPEG format is best for scanned photographs, images using textures,
images with gradient color transitions, and any images that require more than 256 colors.
PNG
, or Portable Network Graphic, is a versatile web graphic format. However, not all web browsers can view PNG
graphics. A PNG can support up to 32-bit color, can contain transparency or an alpha channel, and can be
progressive. PNG is the native file format for Fireworks. However, Fireworks PNG files contain additional appli-
cation-specific information that is not stored in an exported PNG file or in files created in other applications.
WBMP
, or Wireless Bitmap, is a graphic format created for mobile computing devices such as cell phones and PDAs.
This format is used on Wireless Application Protocol (WAP) pages. WBMP is a 1-bit format, so only two colors are
visible: black and white.
TIFF
, or Tagged Image File Format, is a graphic format used for storing bitmap images. TIFFs are most commonly
used in print publishing. Many multimedia applications also accept imported TIFF graphics.
BMP
, the Microsoft Windows graphic file format, is a common file format used to display bitmap images. BMPs are
used primarily on the Windows operating system. Many applications can import BMP images.
PICT
, developed by Apple Computer, is a graphic file format commonly used on Macintosh operating systems. Most
Mac applications are capable of importing PICT images.
Optimizing GIF, PNG, TIFF, BMP, and PICT files
Each graphic file format in Fireworks has a set of optimization options. For the most part, only the 8-bit file types
such as GIF, PNG 8, TIFF 8, BMP 8, and PICT 8 offer a significant amount of optimization control.
Note:
JPEG files are an exception. For more on JPEG optimization controls, see “Optimizing JPEGs” on page 272.
Fireworks optimization settings are similar for all 8-bit graphic file formats. For web file formats such as GIF and
PNG, you can also specify the amount of compression you want on the graphic.
You can optimize 8-bit file types by adjusting their color palettes. Fewer colors in the palette means fewer colors in
the image, resulting in a smaller file size. The drawback to reducing colors is that it can also diminish image quality.
As you experiment with different optimization settings, you can use the 2-Up and 4-Up buttons to test and compare
a graphic’s appearance and estimated file size. For more information on using the document preview buttons, see
“Previewing and comparing optimization settings” on page 263.
Note:
All file types mentioned above (except PICT, which is only supported on the Macintosh version of Fireworks) can
be saved in their original formats in Fireworks CS3 from within the “Save As” dialog box. This behavior differs from that
in previous versions of Fireworks. For more information, see “Saving documents in other formats” on page 23.