Image Compression, Matlab Codes

Consider an image of size 3 inches x 4 inches stored in a computer with the resolution of 1200 dpi, suggest an appropriate compression factor, if this image has to be displayed on a screen of size 6 inches by 8 inches having a resolution of 200 lines per inch and 200 dots per line. What is the matlab code for this by using Image Compression.

[Walter Roberta]

The question is why would you close my question, Who the heck are you