Jakob's cool stuff: September 2014

Tuesday, September 16, 2014

class file format notes

Graphic file formats

it is all about image compression

takes your file and makes it smaller to save hard drive space

all computer documents, or files, are packaged in different formats

the format is determined often by the files origin, such as a soft ware propgram like photoshop, or a device such as a digital drive

graphic image formats fall under 3 categories of compression, lossy and lossless

with lossy, image data ‘lost’ or reduced for smaller file sizes but can cause poor image quility . can result in showing ‘compression artifacts’

lossless retains image data for higher quality, but larger file sizes

lossy will make the image look worse then a lossless photo

gif and jpg both are lossy and compress the image

use pic or tif for better imAGE

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 web format, is high quality and can contain an alpha (transparency) channel

the are used for different things

TIF

stands for tagged image format

common format for desktop publishing, print, photo and, graphic design

is a a lossless file format. it retians alot of the detial

not good for web

big

JPG

stands for joint photo experts group

created for digital photography and works best for photo content

is a lossy format

can reduce an image file size by 10:1 without showing significant compression artifacts

the level of compression is adjustable

don't print as a jpg print as a tif

gif is made for flat artwork and good for illustration and cartoons

jpg gives images banding

GIF

stands for grapics interchange formant

is best for graphics or images that have flat color or even tone or even tone, such as a cartoon

rduces image size by indexing color from 3 channels to 1

gif cantiona no dpi not a prper format for printing

is adjustable by changing the bit levels 1 to 8

tif and gif should be the best

gif is the worst for a photo graphic image

jpg is the worst for grapics

tif and jpg are best for for iamges with pixels that blend in color, this is called contiguous pixels

GIF is best for images with flat even tone or non-contiguous pixels