1. Download JES Tool JES: Jython Environment for Students
Python development tool developed by Georgia Tech
Download and install JES at C:/100
Select Jes windows.zip

2. Unzip JES Tool
Right-click on the zip file in Downloads folder, select ‘Extract All’

3. Select unzip folder
Select C:\100 to unzip

4. Download media files Under C:\100, you should have
Create a new folder pics under C:\100
Download
Save into C:\100\pics
Right click and select 7-zip &‘Extract here.”
Under C:\100, you should have
C:\100\jes windows
C:\100\pics (folder)
Make a desktop shortcut to jes windows\JES.exe (Python head icon)

5. Python/JES JES IDE (Integrated Development Environment)
Incorporates editing environment
Program pane
Command pane
Watcher button to view debugging

6. Picture Functions in JES
Identify a picture and NAME it
Determine width and height of the picture
Do operation on a pixel, propagating the same operation over the entire picture

7. 1. How to access a Picture in JES ?
Select a picture file
For example,
myFile = pickAFile()
WARNING: picture file (eiffel.jpg) is NOT a picture
A picture file HAS TO BE converted to a picture object
myPic = makePicture(myFile)
Or,
myPic = makePicture(pickAFile())

8. 2. Get Picture Dimension pWid = myPic.getWidth()
pHgt = myPic.getHeight()

9. 3. Image Processing Negative B/WReduce Red Sunset Posterize Redeye
Sepia-tone
Mirror
Symmetry
Background substitution – chromakey
Edge Detection
Rotate
Scale up or down a picture

10. Access a Pixel in a picture
pixel = picture.getPixel(x,y)
Given a pixel px,
Get individual colors: px.getRed(), px. getGreen(), px.getBlue()
Set new colors: px.setRed(255), …
Work with a color in (R,G,B)
myG = makeColor(0,255,0)
px.setColor(myG)
myColor = px.getColor()
myColor = pickAColor()

11. Example >>> pic = makePicture(pickAFile())
>>> pix = pic.getPixel(1,1)
>>> print pix
Pixel, color=color r=168 g=131 b=105
# get/set individual color values
>>> print pix.getRed()
168
>>> pix.setRed(255)
255
>>> color=pix.getColor()
>>> print color
color r=255 g=131 b=105
>>> pix.setColor(color)

12. LAB_1024
Pick any picture
Draw a horizontal line of 10 pixels from (20,50) in the picture