■ Image Compression: LZW. Save the file with Lemple-Zif-
Welch compression. LZW is a lossless compression format
that is best for large areas of a single color,
such as a sky, wall, or a screenshot. File
sizes can be reduced by up to two-thirds
with no loss of data.
■ Image Compression: ZIP. A lossless
compression format similar to LZW. This
format is best used for images with large
areas of a single color.
■ Image Compression: JPEG. JPEG (Joint
Photographic Experts Group) compression
that uses the same DCT function as the
JPEG standard. Use the slider bar to control
the amount of compression (see Figure 7.7). Note that most programs other
than Photoshop and Photoshop Elements will not be able to open TIFF files
saved with this compression technique.92 ABSOLUTE BEGINNER’S GUIDE TODIGITAL PHOTOGRAPHY
FIGURE 7.6
Annotations are
viewable but
not editable in
Elements.If you are going to give
a friend, customer, or
service bureau a TIFF
file, ask about compres-
sion options before you
save it. To ensure compatibility with
others, never use compression on
TIFF files.caution