An image file in the .PspImage format can be saved without compression, or it can be compressed to save space. Both of the compression methods that Paint Shop Pro uses are lossless, and reduce the file size without losing any image information. Saving a file without compressing it is the quicker method, but it requires more hard disk space.
Run length encoding (RLE), which is fast and compresses most multi-layered images to about 75% of their original sizes. It works well with images that contain large areas of the same color.
LZ77 compression, which is slower than RLE, but can compress an image to a smaller size than RLE. It works well with photo-realistic images.
Capturing Images from a Computer Screen
Setting Screen Capture Options
Importing Images from Digital Cameras and Scanners
Using the Paint Shop Pro Browser