COMP6021 Assignment

Image compression requires a trade-off between image quality and file size. If the compression ratio is set too high the image quality becomes unacceptable. If it is set too low, bits are wasted. Finding the right point on the cost-quality curve can be a challenge.

Take three very different high resolution images of dimensions greater than 600 x 800 pixels.

For each image:

• Resize (or crop if you must) the image to size 600 x 800.
• Save the image with increasingly fewer colors, with and without dithering, until you believe you have found the best settings for the image.
• Demonstrate that pushing the compression ration further would produce poor results
• Graph the size of the image against the number of colors, with and without dithering on the same graph

Write a report outlining your results. The report should contain sample images.

I will bring images to the lab.

Put the report online and e-mail the URL to Colin before noon on Friday 05 November