notes 9-15-16
graphic file format
- all computers documents or files are packaged in different formats
- the formats is determined often by the files origin such as a software program like photoshop or a device such as a digital camera
- graphic files such as a photo video
lossy lossless
- graphic image formats fall under 2 categories of comparison lossy and lossless
- with lossy image data is lost or reduced for smaller sizes but can cause poor image quality can show result in showing comparison artfacts
- lossless retains image data for higher quality but larger sizes
graphic formats
- TIF, JPG, and GIF are the 3 most common formats for common activities such as printing scanning and displaying images over the internet
- PNG is a common web format is high quality and can contain an alpha channel
- each format has its own advantages and disadvantages
file format
- stands for tagged image format
- common format for desktop publishing print photo and graphic design
- is a lossless file format it retains image data
file format JPG
- stands for joint photographers group
- created for digital photography and works best for photo content
- is a lossy formant
- can reduce image file size by 10:1 without showing significant comparison artifacts
- the level of comparison is adjustable
File format GIF
- stands for graphic interchange format
- is best for graphic or images that have flat color or even tone such as a cartoon
- reduces images by indexing color from 3 channels to 1
- is adjustable by changing color bit levels from 1-8
- contains no PDI dot sper inch data for printing not a proper format to print
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