| Dithering and Anti-Aliasing
Images that are "fuzzy" (dithered) or photorealistic usually
sport much larger file sizes. By reducing dithering, you can
reduce file sizes. To do this, avoid saving files with "diffusion"
in Photoshop, and always try to work with web safe colors
from the start when creating artwork for the Web. Doing so
will mean less need for masking unsightly color shifts with
dithering effects.
Also, in creating text as an image file, you
might choose to leave text aliased (or pixelated) instead of
smoothing the edges with anti-aliasing. This can reduce file
sizes by half, though it does looks jaggy. Experiment with
different effects to find the balance between attractive images
and small file sizes.
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Adobe
Information on Adobe products such as Photoshop.
Ultimate Photoshop Resource
Tips, tutorials, filters, and more from Macmillan Computer
Publishing's Ultimate Photoshop Resource.
Web Page Design for Designers: Typography
Explains aliasing and anti-aliasing with type.

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