Adobe PHOTOSHOP 5.0 User Manual page 57

You can avoid the need for resampling by scanning
in or creating the image at a high enough
resolution. If you want to preview the effects of
changing pixel dimensions on-screen or print
proofs at different resolutions, resample a
duplicate of your original file. (See "Duplicating
images" on page 172.)
Applying the Unsharp Mask filter to a
resampled image can help refocus the
image's details. For instructions, see "Step 6:
Sharpen the image" on page 128.
A B
A. Original B. Resampled down C. Unsharp Mask applied
Changing the pixel dimensions of an
image
When preparing images for online distribution
(on a Web site, for example), it's useful to specify
image size in terms of the pixel dimensions. Keep
in mind that changing pixel dimensions affects not
only the size of an image on-screen but also its
image quality and its printed characteristics—
either its printed dimensions or its image
resolution. (See "About image size and resolution"
on page 42; "About resampling" on page 48.)
To change the pixel dimensions of an image:
Choose Image > Image Size.
1
Make sure that Resample Image is selected, and
2
choose an interpolation method, as described in
"Choosing an interpolation method" on page 51.
To maintain the current proportions of pixel
3
width to pixel height, select Constrain Propor-
tions. This option automatically updates the width
as you change the height, and vice versa.
Under Pixel Dimensions, enter values for Width
4
and Height. To enter values as percentages of the
current dimensions, choose Percent as the unit of
measurement.
The new file size for the image appears at the top
of the Image Size dialog box with the old file size in
parentheses.
C 5 Click OK to change the pixel dimensions and
resample the image.
For best results in producing a smaller
image, resample down and apply the
Unsharp Mask filter. To produce a larger image,
rescan the image at a higher resolution.
Changing the print dimensions and
resolution of an image
When preparing images for print, it's useful to
specify image size in terms of the printed dimen-
sions and the image resolution. These two
measurements determine the total pixel count and
therefore the file size of the image. (See "About
image size and resolution" on page 42.)
ADOBE PHOTOSHOP 5.0 49
User Guide