-order of color channels
-image compression information
-matadata about pictures
(Exchangeable image file format EXIF, etc.)
point-process computations
add/subtract images
a-blending & its applications
image histograms
i(x,y)
How to obtain discrete values?
– sample the two-dimensional (2D) space on a regular grid
– quantize each sample (round to “nearest integer”)
Result: matrix of integer values (range, e.g. 0-255)
Point-Process: Pixel/Point Arithmetic
subtract value, if it is negative, it would be Black
image 1 – image 2
binary(image 1 – image 2)
CD+AE+LD
-> whole are become over 255
alpha-blending
.34 CD + .34 AE + .34 LD
transparency(conversely, opacity)
usually represented as α
α varies from 0 to 1.0
RGB -> αRGB 0-1, 0-255
