Monday, September 30, 2013
Thursday, September 26, 2013
Tuesday, September 24, 2013
Monday, September 23, 2013
Wednesday, September 18, 2013
Tree Picture Format Test Review
Best Image Quality: PNG 24
Worst Image Quality: GIF Restricted
Smallest File Size: JPEG Low
Largest File Size: PNG 24
Which image has the best balance of quality and size? Why?
The JPEG High had the best file size for quality. There is a slight noticeable difference between the JPEG High and the PNG 24, but it is worth it for the smaller file size of 30 KB (down from 139 KB).
Gradient Circle Format Test Review
Best Image Quality: PNG 24
Worst Image Quality: GIF Restrictive
Smallest File Size: JPEG Low
Largest File Size: PNG 24
Which image has the best balance of quality and file size? Why?
The PNG-8 128 Dithered had the best file size for quality. The quality was comparable to the PNG 24 (you can barely notice the difference) and it has a 9 KB file size, which is about average.
Understanding File Formats
- different formats change file size, image quality
- each document saved in specific format
- some programs (ex. Photoshop) have own file format
- format determined by file origin and destination
- lossy format -- reduces data, reduces file size, can reduce quality
- lossless -- changes format, doesn't compress, higher quality, used for printing
Formats
- most common for printing, scanning; web friendly -- tif (print), gif, jpg
- png -- common web format, high quality (not small file size), has transparancy (alpha) channel
TIF -- tagged image format
- desktop publishing, print, photo, graphic design
- lossless format -- large files, max quality
- good for blended color, contiguous pixels
- not internet friendly
JPG -- joint photography group
- created for digital photography
- lossy format w/o showing significant compression articles
- level of compression is adjustable
- good for blended color, contiguous pixels
- trouble with gradation
GIF -- graphic interchange format
- best for internet w/ flat color
- indexes color, reduces number of colors
- adjustable compression (1 --> 8)
- can have animation
- good for flat, hard edges, non-contiguous pixels
- not good for print, is internet friendly
Pixels -- Aliase vs Anti-Aliase
- Aliase -- jaggies; hard, zig-zag edges; no smooth shapes; ragged
- Anti-Aliase -- tries to smooth edges, blends
Monday, September 16, 2013
Friday, September 13, 2013
Wednesday, September 11, 2013
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