Transcript pictures & graphics

pictures & graphics
by Patrick and David
content
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definitions
focus: pictures
JPEG
GIF
TIFF
comparision
focus: graphics
definitions
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PICTURES:
are matrixes of individual points (pixels)
with color-informations
GRAPHICS:
are objects of vectors (with color
information) that are placed upon
eachother
focus: pictures
File - Examples are:
 .jpg (.jpeg)
 .gif
 .tif (.tiff)
 .tga
 .psd
 .png
JPEG
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data compression with high losses
varying levels of compression with
varying loss of detail
compression up to 5% of normal size
throws away some of the graphic data
16,7 mio. colors
JPEG (2)
JPEG (3)
Advantages
 standard image format for Web pages
 small file size
 32-bit color
Disadvantages
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compression loses data
software compatibility problems
not transparent
JPEG (compression & quality)
181.8 KB
16.1 KB
10.3 KB
GIF
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standard bit-mapped
graphics file format
developed by CompuServe
supports 256 colors
has extra functionality,
concerning transparency
and animation
techniques patented by
CompuServe
GIF (2)
Advantages
 standard image format for Web pages
 supports transparent, interlaced, and
animated images
 8-bit (256) color
Disadvantages
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not supported by most word processing
programs
limited color depth
GIF (3) construction
GIF (4)
examples
TIFF (Tag Image File Format)
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Type:
Bitmap
Colors:
1- to 24-bit
Compression:
Uncompressed, RLE, LZW, CCITT
Group 3 and Group 4, JPEG
Maximum Image Size:232
poorly portable between different applications
very variable format, which offers many possibilities,
but the format is to understand with difficulty
ultimative comparison
.jpg(90)
.gif
.tif
graphics (vector-)
advantages
 easier to scale
 often in ASCII-format
 easy to convert into other file types, like .bmp
Disadvantages
 complex pics are hard to store
 representation depends on user application
and output device
review
1.
2.
3.
4.
5.
6.
7.
definitions
focus: pictures
JPEG
GIF
TIFF
comparision
focus: graphics
that‘s it!
any QUESTIONS ?!?