Scanning Images - Adobe PHOTOSHOP 5.0 User Manual

3 For Screen, enter the screen frequency for the
output device. If desired, choose a new unit of
measurement. Note that the screen value is used
only to calculate the image resolution, not to set
the screen for printing.
Important: To specify the halftone screen ruling for
printing, you must use the Halftone Screens dialog
box, accessible through the Page Setup dialog box.
For Quality, select an option:
4
Draft to produce a resolution the same as the
•
screen frequency (no lower than 72 pixels per
inch).
Good to produce a resolution 1.5 times the
•
screen frequency.
Best to produce a resolution 2 times the screen
•
frequency.
Click OK.
5
Choosing an interpolation method
When an image is resampled, Adobe Photoshop
uses an interpolation method to assign color values
to any new pixels based on the color values of
existing pixels in the image. The more sophisti-
cated the method, the more quality and detail
from the original image are preserved.
The General Preferences dialog box lets you
specify a default interpolation method to use
whenever images are resampled with the Image
Size or transformation commands. The Image Size
command also lets you specify an interpolation
method other than the default.
To specify the default interpolation method:
Choose File > Preferences > General.
1
For Interpolation, choose an option:
2
Nearest Neighbor for the fastest, but least
•
precise, method. This method can result in jagged
effects, which become apparent when distorting or
scaling an image or performing multiple manipu-
lations on a selection.
Bilinear for a medium-quality method.
•
Bicubic for the slowest, but most precise,
•
method, resulting in the smoothest tonal
gradations.

Scanning images

Before you scan an image, make sure that the
software necessary for your scanner has been
installed. To ensure a high-quality scan, you
should predetermine the scanning resolution and
dynamic range your image requires. These prepa-
ratory steps can also prevent unwanted colors casts
from being introduced by your scan.
Scanner drivers are provided and supported by
the manufacturers of the scanners, not Adobe
Systems. If you have problems with scanning,
make sure that you are using the latest version
of the appropriate scanner driver.
ADOBE PHOTOSHOP 5.0 51
User Guide