Compressing images and sound, optimising vector images and recycling images from libraries.
File compression
http://www.xfutureblog.com/2007/09/27/how-to-reduce-or-compress-avi-file-size-and-upload-to-youtube/
File Compression
It is called Compress.
Some ways to reduce the size of AVI files is: 1. Reduce the resolution. 2. Reduce the frame rate. 3. Increase the key frame rate. 4. Change the compressor. However You may lose some quality when trying to reduce file size.
Image compression, sound compression, use of text (breaking up text causes the file size to increase).
It all depends on the type of digital file you are using. Most printers will do the reduction or enlargement in house. If the printer requires the file to be the exact size of the finished piece reducing the actual physical size of the file is quite simple, with the proper software. Another advantage is that no image quality will be lost when the file is reduced in size, whether it is a jpg, eps or tiff. From within Photoshop choose Image Size from the menu and reduce the size there. You can also scale the image in Photoshop or Illustrator. To reduce the file size you will need to 'stuff' or 'zip' the file with compression software.
Zip the file with a program like WinZip.com
Compress
zip
reducing the quality will decrease it size
no. It can also increase the file size in very few cases, because it stores a header with information used in the decompression process.