8
15. Close the Web browser and return to ImageReady. Then close the illustration without saving it.
Superior Colour Control
Adobe ImageReady lets you exercise exact control over the colour palette for each 8-bit (indexed) image, so
that you can make fine tradeoffs between image size and image quality. As you’ve now seen in the previous
section, you can choose among four types of colour palettes for these images:
•
Adaptive
ImageReady produces a custom palette for your image just as Photoshop does—by looking for
the most commonly used colours in the image. For example, if the original image is dominantly green
and blue, the Adaptive palette is as well.
•
Perceptual
A Perceptual palette is similar to an Adaptive palette in that it’s based on sampling colours
from the dominant image colours. However, in generating the Perceptual palette, certain colours are
weighted differently than others for sensitivity to the human eye, often producing superior colour results.
•
Web safe
Most Web browsers, including Microsoft
®
Internet Explorer and Netscape
®
Navigator
®
, use a
standard, 216-colour Web palette to display images when a monitor is set to 8-bit colour mode. This Web
palette is based on the 216 colours common to both the Mac OS and Windows system. Many designers
work with this palette from the start as it gives them predictable control over their image dithering.
•
Custom
This option lets you specify your own custom palette or use a Mac OS or Windows system
palette instead.
A
Click a colour to select it.
B
Delete selected colours from the palette.
C
Add the current foreground color to the palette and mark
it as locked.
D
Lock selected colours to prevent them from being dropped
or dithered.
E
Convert selected colours to their Web-safe equivalents to
mix the benefits of custom and Web-safe palettes.
F
View the number of colours in the palette.
ImageReady presents helpful details in the browser window when you preview your optimised graphics.
You can simply make a note of the IMG SRC tag, or you can copy and paste this information into an HTML
editor to use in creating your Web pages.
A
B
C
D
E
F