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68
Adobe Photoshop Help
Getting Images into Photoshop and ImageReady
Using Help
|
Contents
|
Index
Back
68
If you turn on resampling for the image, you can change print dimensions and resolution
independently (and change the total number of pixels in the image). If you turn resam-
pling off, you can change either the dimensions or the resolution—Photoshop adjusts the
other value automatically to preserve the total pixel count. For the highest print quality,
it’s generally best to change the dimensions and resolution first without resampling. Then
resample only as necessary.
To change the print dimensions and resolution of an image:
1
Choose Image > Image Size.
2
Change the print dimensions, image resolution, or both:
•
To change only the print dimensions or only the resolution and adjust the total number
of pixels in the image proportionately, make sure that Resample Image is selected.
Then choose an interpolation method. (See
“Choosing an interpolation method” on
page 66
.)
•
To change the print dimensions and resolution without changing the total number of
pixels in the image, deselect Resample Image.
3
To maintain the current proportions of image width to image height, select Constrain
Proportions. This option automatically updates the width as you change the height, and
vice versa.
4
Under Document Size, enter new values for the height and width. If desired, choose a
new unit of measurement. Note that for Width, the Columns option uses the width and
gutter sizes specified in the Units & Rulers preferences. For more information, see
“Using
columns (Photoshop)” on page 44
.
5
For Resolution, enter a new value. If desired, choose a new unit of measurement.
To return to the original values displayed in the Image Size dialog box, hold down
Alt (Windows) or Option (Mac OS), and click Reset.
To view the print size on-screen:
Do one of the following:
•
Choose View > Print Size.
•
Select the hand tool or zoom tool, and click Print Size in the options bar.
The magnification of the image is adjusted to display its approximate printed size, as
specified in the Document Size section of the Image Size dialog box. Keep in mind that the
size and resolution of your monitor affect the on-screen print size.
Determining a recommended resolution for an image
(Photoshop)
If you plan to print your image using a halftone screen, the range of suitable image resolu-
tions depends on the screen frequency of your output device. You can have Photoshop
determine a recommended resolution for your image based on your device’s screen
frequency. (See
“About image size and resolution” on page 62
.)
Note:
If your image resolution is more than 2.5 times the screen ruling, an alert message
appears when you try to print the image. This means that the image resolution is higher
than necessary for the printer. Save a copy of the file, and then reduce the resolution.
