Epson 1250 - Perfection Photo Flatbed Scanner Uso manual - Página 3

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Epson 1250 - Perfection Photo Flatbed Scanner Uso manual

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

dimensions of the output scan. They also work proportionate-

ly–change one and you automatically change the other an equal

amount.

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

dpi.

12800

from

, 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

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

In our labs, the black and white printer =

the colour =

100

Black and White printer example:

lpi x (

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

ppi, although

lpi.

" ÷

" ) =

dpi/ppi

2.5

240

dpi).

ppi is used occasionally.

November /03

lpi, and

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