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CHAPTER 11
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Inserting Images
Three graphic file formats are generally used in Web pages—GIF, JPEG, and
PNG. Currently, only GIF and JPEG file formats are fully supported by most
browsers. Microsoft Internet Explorer (4.0 and later) and Netscape Navigator
(4.04 and later) partially support the display of PNG images. Unless you are
targeting your site to users with browsers that support the PNG format, use
GIFs or JPEGs for broader appeal.
GIF (Graphic Interchange Format)
files use a maximum of 256 colors. GIFs are
best for displaying noncontinuous-tone images or those with large areas of flat
colors, such as navigation bars, buttons, icons, logos, or other images with
uniform colors and tones. You can create GIFs with transparent backgrounds;
interlaced GIFs, which slowly come into focus as an image loads in the browser; or
animated GIFs, which are a number of GIFs saved as a single file.
JPEG (Joint Photographic Experts Group)
file format is the superior format for
photographic or continuous-tone images, because JPEG files can contain millions
of colors. JPEG files tend to be larger than GIF and PNG files. As the quality of a
JPEG file increases, so does the file size and the file download time. You can often
strike a good balance between the quality of the image and the file size by
compressing the JPEG file.
PNG (Portable Network Group)
file format is a patent-free replacement for GIFs
that includes support for indexed-color, grayscale, and true-color images, and
alpha channel support for transparency. PNG is the native file format of
Macromedia Fireworks. PNG files retain all the original layer, vector, color, and
effects information (such as a drop shadow), and all elements are fully editable at
all times. Files must have the .png file extension to be recognized as PNG files by
Macromedia Dreamweaver.
You can insert GIFs, JPEGs, and PNGs in Dreamweaver documents. In addition
to inserting an image in a page, you can also insert an image in a table, in a form,
or in a layer.
Summary of Contents for 38028779 - Macromedia Dreamweaver - Mac
Page 1: ...macromedia Using Dreamweaver...
Page 148: ...Chapter 4 148...
Page 296: ...Chapter 12 296...
Page 472: ...Chapter 18 472...
Page 512: ...Chapter 21 512...
Page 562: ...Appendix 562...
