Movie of picture negatives

# Pseudo Codedef movieNeg(directory, pic): for each column of ‘pic’ across the entire width

for each pixel from top of

the column to bottom

convert a pixel to its

negative in ‘pic’

save ‘pic’ into frameXXX.jpg

# Python Codedef movieNeg(directory, pic):

LAB

• Complete the movie making that captures column-wise complementing of a picture, if you were not able to finish on Wed.

• Write a function to create animation frames with increasingly more sunset effects.

• Email only your python program (not a screen shot) to kim@cs.uml.edu

Create a sunset animation

makeSunset(pic, r) function creates a sunset effect on a single picture called ‘pic’ by reducing green and blue in every pixel by r percent, where the value of r is specified when the function is called. Its Python code is in the next slide.

Write a function that repeatedly calls makeSunset(pic,r), each time with smaller fractional value. After sunset effect is created, the picture is saved into ssXX.jpg with a 2-digit sequence number.

Put together a series of pictures into an animation

Sunset effect on one picture

def makeSunset(picture, r): for x in range(1, getWidth(picture)): for y in range(1, getHeight(picture)): p = getPixel(picture, x, y) value=getBlue(p) setBlue(p,value*r) value=getGreen(p) setGreen(p,value*r) return picture

Slow Sunset in animation

We know how to make one picture with a sunset effect

Repeatedly apply sunset effect on the same picturedef slowsunset(pic):

rate = 1.0 Repeat for N times

create an empty picture with the same dimension as ‘pic’ Reduce the value of ‘rate’ (say, by 1/N) newPic = makeSunset(pic, rate)

save newPic as ssXX.jpg

Final Project

Due: 5/7 (Th) 3:00 pm Presentation of the final project:

2-min presentation on 4/17 (F) on project topic 10-min each on 5/7 3:00-6:00pm