Operation Manual

66
USING PHOTOSHOP
Understanding and opening images
Last updated 12/5/2011
Screen frequency examples
A. 65 lpi: Coarse screen typically used to print newsletters and grocery coupons B. 85 lpi: Average screen typically used to print newspapers
C. 133 lpi: High-quality screen typically used to print four-color magazines D. 177 lpi: Very fine screen typically used for annual reports and
images in art books
More Help topics
About desktop printing” on page 442
Preparing images for press” on page 450
Resampling
Resampling is changing the amount of image data as you change either the pixel dimensions or the resolution of an
image. When you downsample (decrease the number of pixels), information is deleted from the image. When you
resample up (increase the number of pixels, or upsample), new pixels are added. You specify an interpolation
method
to determine how pixels are added or deleted.
Resampling pixels
A. Downsampled B. Original C. Resampled up (selected pixels displayed for each set of images)
A
B
C D
A
B
C