Microtek 35t plus User Guide
37
Reference
Choosing the best resolution setting
Scanning at a higher resolution requires more time, memory, and disk space. When
choosing a resolution setting, consider the type of image you're scanning and the
printing method. Printed images have their own resolution, as measured in lines per inch
(lpi), which is distinct from the resolution of electronic images (as measured in dpi).
choosing a resolution setting, consider the type of image you're scanning and the
printing method. Printed images have their own resolution, as measured in lines per inch
(lpi), which is distinct from the resolution of electronic images (as measured in dpi).
An easy way to determine the best resolution for your intended output is to find out the
lines per inch (lpi) capability of your output device and multiply it by 1.5 to 2.0.
lines per inch (lpi) capability of your output device and multiply it by 1.5 to 2.0.
For instance, to tailor your scanned image to a typical magazine printing press that
prints at 133 lines per inch, multiply 133 x 1.5 or 2.0, which gives 199.5 or 266. In this
case, the optimal resolution setting for your image would then be 200 dpi to 266 dpi
(depending on how high the output quality will be). Lpi varies, depending on the quality
of the printing job. A newspaper uses approximately 85 lpi, magazines from 133 to 150
lpi, and fine art books may go as high as 200 to 300 lpi.
prints at 133 lines per inch, multiply 133 x 1.5 or 2.0, which gives 199.5 or 266. In this
case, the optimal resolution setting for your image would then be 200 dpi to 266 dpi
(depending on how high the output quality will be). Lpi varies, depending on the quality
of the printing job. A newspaper uses approximately 85 lpi, magazines from 133 to 150
lpi, and fine art books may go as high as 200 to 300 lpi.
If you're outputting images to a monitor (such as doing multimedia work), you need not
scan images higher than 72 dpi, as monitors are capable of only showing images up to
72 dpi. A higher-resolution image will not be any clearer on the monitor and will simply
create larger files.
scan images higher than 72 dpi, as monitors are capable of only showing images up to
72 dpi. A higher-resolution image will not be any clearer on the monitor and will simply
create larger files.
When to use high resolution
High resolution is important if you're processing an image through a high-end color
system that carries continuous tone data from the scanner through the final film output.
This is because high resolution can improve the sharpness and clarity of the dots that
make up the image.
system that carries continuous tone data from the scanner through the final film output.
This is because high resolution can improve the sharpness and clarity of the dots that
make up the image.
When to use interpolated resolution
Interpolated resolution is useful for scanning line art or enlarging small originals.
• For line art: Set the resolution equal to that of your output device. For instance, if
you're producing line art to be printed by a 1200-dpi imagesetter, you can interpo-
late resolution to up to 1200 dpi for superior results. This will produce smoother
lines and eliminate some of the jaggedness characteristic of line art scans.
late resolution to up to 1200 dpi for superior results. This will produce smoother
lines and eliminate some of the jaggedness characteristic of line art scans.
• For enlarging small originals: Let's assume that you scan a 1" x 2" photograph at
300 dpi, and that your maximum optical resolution is 300 dpi too. To enlarge the
image to two times the original size without loss of detail, interpolate the resolution
to 600 dpi. This way, the image retains clarity and sharpness even if the print size
was doubled.
image to two times the original size without loss of detail, interpolate the resolution
to 600 dpi. This way, the image retains clarity and sharpness even if the print size
was doubled.