Class 37 April 18

Image manipulation

I need a haiku — I cannot find one I like — Can you help me please

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Always look both ways

• Back and ahead

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Form please

• Help improve CS 1112

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Module gamma.py

• Defines three functions in support of gamma correction, where a gamma correction supports the lightening and darkening of an image.

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Consider

• Gamma resource

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Function correction( i, gf )

• Returns the gamma correction for gamma factor gf for value intensity i; that is, it returns the integer i_prime equal to

int( 255 ( i / 255 ) 1/gf  )

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Function pixel( p, gf )

• Returns a new pixel whose RGB values are gamma corrections for gamma factor gf of the RGB values of pixel p. That is, if pixel p RGB values are (r, g, b), then new pixel has RGB values (correction(r, gf), correction(g, gf), correction(b, gf))

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Function create( original, gf )

• Returns a new image whose dimensions match that of original, where a pixel in the new image is a gamma factor gf correction of the corresponding pixel in original.

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To do

• Review artifacts

• Homework 26 — a bottom-up assignment

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Imaging effects — gamma

Original	Gamma = 2.0	Gamma = 0.25

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Homework motivation

 

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