Graphics software works with two file formats:
· Raster Images (also known as bitmap), and
· Vector Images
Photoshop
· Uses bitmap (which is created using pixels)
· These raster images are created when we take digital photographs and/or scan images, fabrics and drawings.
Illustrator
· Uses vector
What are the Differences?
Raster Images
· 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 i.e. Photoshop.
· You get the best results when you scan and work at the correct resolution and size from the beginning.
Vector Images
· Created by a mathematical formula which forms smooth lines
· Curves and geometric objects
· Resolution independent (show examples).
· Scaled up of scaled down without image deteriorating- they remain sharp and clear.
· Make excellent line drawings- t-shirt images for sportswear etc.
· Much smaller file size than BITMAP, making flats ideal to send via email.
· Once downloaded can be scaled to required size.
Raster Selection (Complex)
Computer doesn’t know that all the pixels are part of the same object.
Vector Selection (Simple)
Just a matter of clicking on the shape to select individual parts.
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