Introduction to Adobe Illustrator
Powerful Vector-based Illustration Program for Graphic Designers
Jun 26, 2008
Vectors vs. Pixels
Illustrator provides an environment where objects are drawn using vectors, which are based on precise locations of points and lines. These points and lines retain their locations and are assigned values such as line thickness, color, and curve values. All artwork is editable once it is drawn and can be changed to the artist’s desires. This allows for incredible flexibility in an illustration’s development.
Vectors used in Illustrator are different from the use of pixels in pixel-based programs such as Photoshop. Pixels exist in a grid of dots assigned with individual color values and are the basis for digital photography, scanned artwork, or digitally-created artwork.
No Limits on Size
While pixel-based artwork can provide great detail for images such as photographs or other artwork, it has limitations in use based on image resolution. At some point, an image cannot be enlarged without blurring details due to pixel limitations. It’s similar to when someone uses a copier to enlarge; the details start to look rough.
Since vectors are based on absolute positioning and are assigned absolute values, they may be scaled as large as can be allowed by Illustrator or a printer’s capabilities and still look great. A word set in 72 pt. type in a pixel-based program will start to look fuzzy when enlarged to a letter-sized printout. But set the same type in Illustrator, it could be enlarged to the size of an outdoor billboard and still have razor-sharp edges. See example A below for a comparison of pixels versus vectors.
Vector Art Easier to Change
Changes to artwork done in pixels are limited to color and tone adjustments or to tools that simulate brushes or pencils. Text editing in pixels is very laborious, depending on the use of background image.
This is where vector-based artwork is vastly superior. All text is editable. Lines, shapes, and other artwork can be changed to the artist’s preference of color, thickness, and other styling choices. Multiple changes can be made in a matter of moments, giving the designer great flexibility.
llustrator Can Work with Vectors and Pixels
Adobe Illustrator not only provides an excellent vector-based environment, but also allows for pixel-based illustrations to be placed within artwork. Plus there are many special filters and effects that can be applied to vector artwork to give it the appearance and benefits of pixel-based artwork. One could say that Illustrator features can give a designer or illustrator the best of both worlds.
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