How Compression Works in Acrobat Distiller
Scenario: You nave to create a PDF proof which will be e-mailed to your client. Your file must be as small as possible to download quickly, but the quality must be high enough for the client to view the design in detail. To create the appropriate PDF, you must understand enough about compression to choose the appropriate Distiller job options settings.
Instructions:
1. Print
this page.
2. Click on the link below for an in-depth explanation of the kinds of
compression Distiller offers.
3. Use your printout to answer the questions below.
4.
Bring your filled out answers to the next class
http://www.planetpdf.com/mainpage.asp?webpageid=610
Student Name:
1. How does compression usually make things smaller?
2. Explain the term lossless compression and give an example of a lossless compression type.
3. Explain the term lossy compression and give an example of a lossy compression type.
4. Describe the relationship between file size and image quality using JPEG compression.
5. What happens when you choose automatic compression in Distiller?
6. For what type of images would you choose CCITT compression?
7. Explain subsampling (also called downsampling).
8. If your your images have been prepared in the correct resolution, what kind of subsampling would you choose in Distiller?