Use the Compress tab to select compression parameters.
Decide which output file type you want and check the box for JPEG, GIF, PNG of TIFF.
Optimization Settings for JPEGs
Set the image quality slider to the desired value. The image quality may be set from 1 (very low quality, high compression) to 100 (very high quality, low compression) but the useful range is typically between 50 and 90. Adjust the quality slider to your desired level of tradeoff between image size and quality.
If the ‘Read Quality from Input JPEG’ is selected then the quality slider is ignored for any JPEG files read in and the quality is set to the value of the input JPEG. This is most commonly used to MagiCompress a set of existing JPEGs.
Set the MagiCompress slider to the desired value. This option tells Image Optimizer to automatically extra compress areas of low detail. The default is 50%. The bigger the number the greater the MagiCompression.
Optimization Settings for GIFs and PNGs
Set the Number Of Colors slider to the desired value. The Number Of Colors may be set from 2 to 256. The best value will depend on the source images. It is best to experiment with typical images using the main application.
Set the Dithering slider to the desired value. The default is 50%. The bigger the number the greater the dithering (and the larger the images).
Optimization Settings for TIFFs
There are no specific settings for TIFFs. The images will be written out as 24 bit uncompressed TIFFs