1. Unit 78 Technical File
By Chris Munro

2. Pixel and Resolution
• Pixel Resolution is the pixel count in any
digital image. Pixel Resolution is described
with 2 sets of numbers the first number is
the pixel columns and the second is the
pixel rows (7680 by 4320)

3. Vector and Raster images
• There are two types of graphic vector and
raster when it comes to computer graphics.
• Raster images are called Bitmap Images
• Bitmap images use a grid of individual pixels
and each pixel can be a different colour.
• Vector images use mathematic relationship
between points and the paths.

4. File formats and uses
• JPG – Used for websites and emails as the file can be compressed making a small file size. But the smaller
the file size the lower the quality, the bigger the file size the higher the quality.
•

5. Compression
• There are two types of image compression
Lossless and Lossy
• Lossless can compress the file to an exact
duplicate of the original but the
compression ratio is not high at all
• Lossy gives you a higher compression ratio as
its strips the file of some of it redundant
data