Class 34 — April 13

Image visualization

The greatest artists — Learned at the feet of masters — Copy and improve

---

Look both ways

• Back or ahead

---

Zoom

• Link

---

To do

• Review artifacts

• Check out imaging epistle

• Homework 30

---

Agenda

• Image transformations

• Implement image duplication

• Implement image bluing

• Implement image monotone

• Implement image color inversion

• Implement image flipping

• Implement image mirroring

• Implement image sepiaing

---

Image manipulator

• Module manip.py

---

Some image manipulation descriptions

• Module copy.py

• Module blue.py

• Module bw.py

• Module neg.py

• Module flip.py

• Module reflect.py

• Module sepia.py

---

Homework

• Implement grayscaling

• Module gray.py

• Implement clockwise rotation

• Module cw.py

• Implement palette reduction

• Module palette.py

---

I see you

		Duplicate
		Bluing
		Monotone
		Mirror
		Flip
		Sepia
		Grayscale
		Clockwise rotation
		Palette reduction
		Zooming
		Pixelate

---

Basic photo-manipulation problem-solving Python function

def manip( original, size, color, where ) :

  ''' Provide a pattern for image manipulation

  '''

  # set dimensions of the new image

  nw, nh = size( original )

  # get a new appropriately sized image

  new_image = Image.new( 'RGB', ( nw, nh ) )

  # fill in every pixel of the new image

  for nx in range( 0, nw ) : # consider every x value for the new image

  for ny in range( 0, nh ) : # in tandem with every y value for the image

  # set the spot to be filled in the new image

  nspot = ( nx, ny )

  # determine the corresponding spot of interest in the original

  ospot = where( nspot, original )

  # get the pixel at the ospot

  opixel = original.getpixel( ospot )

  # determine the pixel for the new image

  npixel = color( opixel )

  # set the nspot in the new image

  new_image.putpixel( nspot, npixel )

  # return the filled in new image

  return new_image

---

---

 

---

 

© 2020 Jim Cohoon

Resources from previous semesters are available.