Epson 1250 - Perfection Photo Flatbed Scanner Manuel Kullanım - Sayfa 3

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Epson 1250 - Perfection Photo Flatbed Scanner Manuel Kullanım
Using the Epson Perfection 1250
Quick Scanning Instructions Cont.
8) Output Resolution. The Epson
at a number of resolutions, ranging from
(See sidebar for more on resolution)
Target: Width and Height.These variables set the final
9)
dimensions of the output scan. They also work proportionate-
ly–change one and you automatically change the other an equal
amount.
10
Scale. Like Target Width and Height, lets you choose the
)
final size of your output scan. Use the slider to set a range
Epson Twain Window
Output Resolution
Source: input size
Target: output size
Scale: output size (%)
Scan
Cancel/ Return
to Photoshop
An html version of the Epson reference guide, and a pdf of
this handout, is also available in the Public area on the
Gould server.
If you encounter any problems with the scanner not covered
in these documents, please contact a technical assistant.
Digital Resource Group: www.eciad.ca/DRG
lets users scan
1250
to
dpi.
50
12800
from
to
, or enter the amount in the % field.
13 %
6400 %
Note: Any reduction, enlargement or resolution adjustment
of your image will effect the file size (mb) of your scan.
Information about file sizes is provided by Size in the
Twain Window.
) Scan. Once the desired settings and preview selection have
11
been chosen, click the Scan button. The scanned image will
open in an untitled Photoshop window as a default TIFF file.
Save the Photoshop file to the Documents folder, a zip disk or a
network account.
Which Resolution Should I Use ?
In a nutshell, the higher the resolution the better
the scan.
You may want to adjust the size and resolution of an
image, depending its use and how it will be output.
For example, will be it be printed? And on which
printer? Or is it destined for the computer
screen/web? Considerations like these will deter-
mine the best resolution for your scan.
File size
For printed material, the following formula is a good
guide for deciding image resolution:
x lpi x (output size ÷ input size)= dpi/ppi
2
In our labs, the black and white printer =
the colour =
100
Black and White printer example:
x
lpi x (
2
75
Colour printer example:
2 x 100 lpi x (4 "÷ 2.5 ") = 320 dpi/ppi
Some Key Terms:
lpi= lines per inch. Term used by printers regarding
commercial offset printing, such as magazines. As a
rule of thumb, lpi is roughly half the dpi of an image
(
lpi =
150
300
dpi=dots per inch. Often used interchangeably with
ppi, or pixels per inch. Technically speaking, dpi is
used with printed material while ppi is reserved for
computer screen images. Most screen images are set
at
ppi, although
72
75
lpi.
" ÷
" ) =
dpi/ppi
4
2.5
240
dpi).
ppi is used occasionally.
96
November /03
lpi, and
3 3