Adobe PHOTOSHOP 6.0 Manual page 56

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What's New in Adobe Photoshop 6.0
Sliced images give you more control over how optimization
Slice-specific formatting and optimization
options are applied because you can select separate slices and apply appropriate settings. An image that
includes solid colors, text, and photographic images, for example, looks best with different settings applied
to different areas. You can also assign a separate file name, URL link, Alt tag, and message to each slice.
In ImageReady, you can link multiple slices together in a set, so you can quickly select, optimize, output,
and delete only those slices.
Setting optimization options for an individual slice; assigning a URL, message text, and an Alt tag to a slice
Photoshop 6.0 intro-
Dynamic layer-based slices
duces a new way to slice images: Set up your slice
content on separate layers and then let Photoshop
or ImageReady generate layer-based slices for you.
When you slice images this way, each slice is bound
to the outermost pixels on each layer. If you then
reposition or edit the content of the layer, the slice
adjusts dynamically to accommodate the changes.
This technique is particularly useful for generating
Slice updates automatically when source layer is modified.
precise slices for rollovers.