Crossword Construction Kit window > Options > Preferences > Graphics Options
This option is used to control the file size of any puzzle image saved to a JPEG format. You can compress the file size from a range of 1 - 100. A setting of 100 creates the sharpest image, but also the largest file size. A setting of 1 (one) provides the smallest file size, but also the poorest image. In summary, the higher settings will produce sharper images with correspondingly larger file sizes.
Use the slider bar to set the compression factor or insert a value from 1 - 100 in the edit box.