Graphics Programs Reference
In-Depth Information
setting Resolution
The term resolution refers to pixel density measured in pixels/inch or pixels/cm
(centimeter). Contrary to popular belief, resolution is only important for print
work. Every computer monitor has a different resolution, so there is no way to
ensure that an image with a specific document size will appear at any specific
actual size on the Web.
w h aT i s s c r e e n r e is o l u T i o n ?
Photoshop's default is to create new documents having the resolution of
72 pixels/inch using the Web, Mobile & Devices, and Film & Video presets in
the New dialog box. This “screen” resolution was chosen because traditional
typography has 72.27 points per inch. Windows uses 96 pixels/inch as its
screen resolution. But neither screen resolution is truly of any consequence
because all monitors are different. Pixel dimensions are all that matter on
the Web because it is pixel dimension that is coded in HTML tags and never
resolution.
O
Resolution is very important in printed matter. Each device has different limits
on how many dots or lines per inch (or cm) it can print. In general, the mini-
mum resolution for an acceptable-quality print is 200 pixels/inch (80 pixels/
cm). Photoshop's default is to create new print documents having a resolution of
300 pixels/inch (120 pixels/cm) because most output devices support at least this
equivalent print density. In the following steps, you will change the resolution of an
image without changing its pixel dimensions.
You can set the
default print and
screen resolutions
ontheUnits&
rulers page of
the preferences
dialog box.
1. From the topic's Downloads page at www.sybex.com/go/
photoshopessentials , open the sample file Taj.jpg .
2. Choose Image a Image Size. Deselect the Resample Image check
box if it is currently checked. Right now the document size measures
7.264 inches by 11.111 inches with a resolution of 72 pixels/inch.
3. Change the resolution to 300 pixels/inch (see Figure 3.28). The docu-
ment size is automatically reduced to 1.743 inches by 2.667 inches to
compensate for the increased resolution.
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