Adobe PHOTOSHOP 5.0 User Manual page 60

52 CHAPTER 3
Getting Images into Photoshop
Importing scanned images
You can import scanned images directly from any
scanner that has an Adobe Photoshop-compatible
plug-in module or supports the TWAIN interface.
To import the scan, choose the scanner name from
the File > Import submenu. (See your scanner
documentation for instructions on installing the
scanner plug-in; see page 36 for general plug-in
information.)
If your scanner does not have an Adobe
Photoshop-compatible scanner driver,
use the manufacturer's software to scan your
images, and save the images as TIFF, BMP, or PICT
files. Then open the files in Adobe Photoshop.
Importing an image using the TWAIN
interface
TWAIN is a cross-platform interface for acquiring
images captured by certain scanners, digital
cameras, and frame grabbers. The manufacturer
of the TWAIN device must provide a Source
Manager and TWAIN Data source for your device
to work with Photoshop.
Adobe Photoshop supports the current
TWAIN_32 standard for scanning. Photoshop
does not support TWAIN software used with
Windows 3.1. Contact your scanner manufacturer
for information on the availability of TWAIN_32
source modules.
To import an image using the TWAIN interface:
If you're using the TWAIN device for the
1
first time with Adobe Photoshop, choose File >
Import > Select TWAIN_32 Source. Then select
the device you're using. You do not need to repeat
this step for subsequent uses of the TWAIN
module.
If more than one TWAIN device is installed in
your system and you want to switch devices, use
the Select Source command.
2 To import the image, choose TWAIN_32
(Windows) or TWAIN Acquire (Mac OS) from the
File > Import submenu.
Scanning using the resolution setting
You can determine the settings for your scan using
the original and final image dimensions and the
screen frequency of your output device to calculate
a scan resolution to enter in the scanner settings.
This scan resolution translates into image
resolution when you open the scan in Photoshop.
The quality of final output depends not only on
the scan resolution but also on the resolution of
your output device and the size of the original
image compared with the final image. (See "About
image size and resolution" on page 42 and "Image
resolution and screen frequency" on page 45.)
To estimate scan resolution:
Multiply the screen frequency by 2 (the typical
1
ratio of image resolution to screen frequency
needed to produce a high-quality image).