Page 15 - Adobe Photoshop and Dreamviewer 2021

STAGE 1 / Compositing Images and Artwork

There are two primary types of artwork: Note:

• Vector graphics are composed of mathematical descriptions of a series of Why is this informa-
lines and geometric shapes. These files are commonly created in illustration tion important? The ad
(“drawing”) applications like Adobe Illustrator. Vector graphics are resolution you’re building in this
independent; they can be freely scaled, and are automatically output at the project will be placed in
resolution of the output device. print magazines, so you

• Raster images are made up of a grid of individual pixels (rasters or bits) in have to build the new
rows and columns, called a bitmap. Line art, also called a bitmap image, is file with the appropriate
actually a type of raster image that includes only black and white pixels. Raster settings for commercial
files are resolution dependent — their resolution is determined when you printing. When the
scan, photograph, or create the file. composition is finished,
you will convert it to a
Photoshop is what some people call a “paint” program — it is primarily used to resolution and format
create and manipulate pixel-based, or raster, images. Raster-image quality depends that is appropriate for
directly on the resolution. When you create files in Photoshop, you need to understand digital media display.
the resolution requirements from the very beginning of the process.
Pixels per inch (ppi) is the number of pixels in one horizontal or vertical inch of a digital
raster file. As a general rule, commercial print jobs require 240–300 pixels per inch at the final
output size to achieve good image quality in the printed piece. Some digital media, such as desktop
web browsers, typically require much lower resolution, commonly 72 ppi, although monitors and
mobile devices with HD display capabilities
support higher-resolution images.
It is important to realize that you
cannot significantly increase image
resolution once a raster image has been
created or captured. When you create files
that will be used for both print and digital
media — as you will for this project — you
should start with the higher resolution,
and then reduce it after the composition is The same raster image is reproduced here at 300 ppi (left) and 72 ppi (right).
complete. Notice the obvious degradation in quality when the resolution is set to 72 ppi.

Project 1: Composite Movie Ad 27