Practice images. These are images that I have taken and they are copyright free and can be used for class. 
The images were taken at at a high resolution with 7.2 mega pixel camera (Sony Cyber-shot).
So, until you produce your own images, these can be used to practice interpolating (down resing), manipulating, and optimizing.

Just "right click" the applicable image and download to your desktop.  

 

 

 

 

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