Activity 3: Image Types and Basic Image Enhancement

Below are the different types of images. Images information are found using Scilab's SIP toolbox function imfinfo

Binary Image
FileName: 37081406.gif
FileSize: 15054
Format: GIF
Width: 500
Height: 461
Depth: 8
StorageType: indexed
NumberOfColors: 2
ResolutionUnit: centimeter
XResolution: 72.000000
YResolution: 72.000000

Source:http://www.nisk.k12.ny.us/fdr/ideas/portfolio/vandersee/gifs/37081406.GIF


Grayscale Image
FileName: lena512.bmp
FileSize: 263222
Format: BMP
Width: 512
Height: 512
Depth: 8
StorageType: indexed
NumberOfColors: 256
ResolutionUnit: centimeter
XResolution: 0.000000
YResolution: 0.000000

Source: http://www-ece.rice.edu/~wakin/images/lena512.bmp



Indexed Image
FileName: imgcolor16.gif
FileSize: 27065
Format: GIF
Width: 248
Height: 248
Depth: 8
StorageType: indexed
NumberOfColors: 256
ResolutionUnit: centimeter
XResolution: 72.000000
YResolution: 72.000000

Source: http://idlastro.gsfc.nasa.gov/idl_html_help/images/imgcolor16.gif


Truecolor Image
FileName: mandrill.jpg
FileSize: 327564
Format: JPEG
Width: 500
Height: 480
Depth: 8
StorageType: truecolor
NumberOfColors: 0
ResolutionUnit: inch
XResolution: 96.000000
YResolution: 96.000000

Source: http://www.cs.uwec.edu/~stevende/cs245/labs/lab08-Threads/mandrill.jpg

Note that binary and grayscale images are also indexed images. The difference is that in binary images, there are only two colors (black and white) and in grayscale images there are 256 colors of different levels of gray.