Adobe PHOTOSHOP 5.0 User Manual page 58

50 CHAPTER 3
Getting Images into Photoshop
If you turn on resampling for the image, you can
change print dimensions and resolution indepen-
dently. If you turn resampling off, you can change
either the dimensions or the resolution—
Photoshop adjusts the other value automatically to
preserve the total pixel count. For the highest print
quality, it's generally best to change the dimen-
sions and resolution first without resampling.
Then resample only as necessary.
Note: If your image resolution is more than 2.5 times
the screen ruling, an alert message appears when you
try to print the image. This means that the image
resolution is higher than necessary for the printer
(see page 42). Save a copy of the file, and then lower
the resolution.
To change the print dimensions and resolution of
an image:
1 Choose Image > Image Size.
2 Change the print dimensions or image
resolution or both:
To change only the print dimensions or only the
•
resolution and adjust the total number of pixels in
the image proportionately, make sure that
Resample Image is selected. Then choose an inter-
polation method, as described in "Choosing an
interpolation method" on page 51.
To change the print dimensions and resolution
•
without changing the total number of pixels in the
image, deselect Resample Image.
To maintain the current proportions of image
3
width to image height, select Constrain Propor-
tions. This option automatically updates the width
as you change the height, and vice versa.
4 Under Print Size, enter new values for the height
and width. If desired, choose a new unit of
measurement. Note that for Width, the Columns
option uses the width and gutter sizes specified in
the Units & Rulers preferences (see "Using rulers"
on page 173).
For Resolution, enter a new value. If desired,
5
choose a new unit of measurement.
Click OK.
6
To return to the original values displayed
in the Image Size dialog box, hold down
Alt (Windows) or Option (Mac OS), and
click Reset.
Determining a recommended resolution
for an image
If you plan to print your image using a halftone
screen, the range of suitable image resolutions
depends on the screen frequency of your output
device. You can have Photoshop determine a
recommended resolution for your image based on
your device's screen frequency. (See "Screen
frequency" on page 45.)
To determine a suggested resolution for
an image:
Choose Image > Image Size.
1
Click Auto.
2