Apple Macintosh PhotoFlash - Manual (Page 68)

Resizing the entire image
To resize an entire image, use the Resize command in the Image menu. This
command displays a dialog box in which you can indicate the new dimensions
you want for the image by typing a percentage or typing a new width and a
new height. The Resize dialog box also allows you to resize the work area in
which the image appears and to change the image’s resolution and its size.
The dimensions of an image, its resolution when printed, and its size on disk
are interrelated. An image consists of a grid of
pixels, or dots. The more dots
per square inch, the higher the resolution and overall quality of the image,
and the more room it occupies in memory and on disk (before compression
is applied).
Most monitors display images at a fixed resolution of about 72 dots per inch
(dpi). For this reason, the size of an image displayed on screen may differ
from its size when printed. For example, an image that measures 5 by 3.5
inches on a 72-dpi monitor measures about 2.5 by 1.75 inches when printed
at 150 dpi.
The sections that follow describe how to use the Resize dialog box to change
an image’s dimensions, the dimensions of an image’s work area, or an image’s
resolution. You can choose Undo Resize from the Edit menu after any of these
operations if you’re not happy with the results.
Changing an image’s dimensions
You can use the Resize command to change the dimensions of a single image
or of multiple images represented by selected catalog thumbnails. This
section describes how to resize a single image.
To change an image’s dimensions, make sure the window you want the Resize
command to affect is the frontmost window, then follow these steps:
1 Choose Resize from the Image menu.
The Resize dialog box appears.
58 Chapter 4