Raster and Vector Images

Graphics software works with two file formats:

·      Raster Images (also known as bitmap), and

·      Vector Images

Raster images are created when you scan photos, fabrics, drawings and digital images

Photoshop uses bitmap which are created using pixels, where as Vector uses Illustrator.  

Differences?
Raster

·      Measured in DPI

·      Resolution dependant (when scaled, the pixels get larger and make the image blurry or pixelated with jagged edges).

·      Edited using image editing software ie. Photoshop.

·      Get the best results when you scan and work at the correct resolution and size from the beginning.

Vector

·      Created by a mathematical formula, which forms smooth lines, curves and geometric objects.

·      Resolution independent.

·      Can be scaled up or scaled down without the image deteriorating- they remain sharp and clear.

·      Makes excellent line drawings, DDS kigis, type, t-shirt images for sportswear etc.

·      Much smaller file size than BITMAP.

·      Secs and flats ideal to send via email.

·      Once downloaded can be scaled to required size.

Raster Selection is complex; the computer doesn’t know that all the pixels are part of the same object.

Vector Selection is simple, it’s a matter of clicking on the shape to select individual parts.

Raster is real life (Photoshop) Vector is flat (Illustrator)