The CopyBits tests copy graphic images (icons) directly from off-screen memory into a variety of places on the selected output device. The CopyBits Small test copies small images while the CopyBits Large test copies large images. If your Macintosh supports Color QuickDraw, then the CopyBits test uses Color QuickDraw routines. Otherwise, the test uses Classic QuickDraw routines.
NOTE: The difference between the CopyBits tests and the Pictures test is that the CopyBits tests transfer bits directly from off-screen memory to a video device. The Pictures test draws images as 'PICT' resources.