Photoshop is one of the most widely used raster graphics programs.
Photoshop's abilities include
improving the quality of hand drawn images or photographs by making
contrast and brightness adjustments; the ability to erase mistakes or
"noise" (unwanted background visual information that increases
file size); and the separation or assemblage of images into multiple
layers to create panoramic pictures and photomontages. It also includes a
variety of filters, including blurs, textures, and artistic effects, that
can be applied to both photographs and hand-drawn graphics.
Photoshop 7 is available on all
computers in the DCRP and LAEP labs. A
newer CS2 release is available from Adobe, and is included in the Creative
Suite package, both offered with a student discount.
The following tutorials are
available in .pdf form:
of Illinois at Chicago's Great Cities Urban Data Visualization Seminar
Series has produced a set of Photoshop tutorials that include additional
Tips and tricks
for using Photoshop and scanning images
- Create a
library of trees, cars, and people (or any other commonly used objects
that you find yourself drawing over and over again in street sections
and plans) and save them as *.psd files with a transparent background.
These can then be dropped into your graphics and will save a lot of
- Scanning hand
drawn graphics almost always picks up more gray, fuzzy background
information than you need. Increasing the brightness and contrast will
eliminate this quickly and easily and reduce file size in the process.
Experiment with different levels, but here is a good rule of thumb.
increase the brightness in the range of +25 to +50, and increase the
contrast by approximately half the value of the brightness increase.
- When scanning
drawings that are larger than the flatbed scanner in the computer
labs, they must be scanned in more than one piece and assembled in
Photoshop. To do so without added headaches, scan and assemble
black-and-white images and add color later, in Photoshop or by hand on
plotted bond paper. In the case of very large drawings, Inkstone or
Kinko's offers large format scanning equipment for a fairly reasonable
keyboard shortcuts are available for all of the tools in the tool palette.
To see the default shortcut keys, allow the cursor to hover over the
buttons on the palette, and the keystroke will be displayed in
parentheses. For more advanced users, these shortcut keys can be