Compression Method options
When Manual Select is chosen for the Compression Method, some or all of the
following options are available.
For black and white images/pages only, select one of the following options:
• Modified Modified Read (MMR): This setting is automatically selected when either
Photo and Text or Text is chosen for Original Type.
• Modified Huffman (MH): This setting is automatically selected when Photo is chosen
for Original Type.
• JBIG2 Arithmetic Encoded: This process has better compression performance than
the Huffman encoded process. However, the compression rate is slower than Huffman
encoded and it uses more memory but yields better compression results.
Note
JBIG stands for Joint Bi-level Image experts Group. JBIG compresses only black and
white images.
• JBIG2 Huffman Encoded: Huffman coding takes less page memory and has faster
compression and decompression than the arithmetic coding. Use this option if
high-quality compression results do not matter and you want to use less page
memory.
For grayscale or color images/pages, select one of the following options:
• JPEG: This is the default setting for grayscale/color pages.
• Flate: This option saves the image data at a higher compression rate than JPEG.
Flate is lossless and does not remove data during the compression process.
PDF Security options
The following PDF Security options are available when selecting E-mail Options >
File Format > PDF > PDF Security > Password:
• Encryption Algorithm: Choose one of three encryption methods:
- 128-bit RC4: Encrypts the file by using the 128-bit RC4 method. Files encrypted
with this method can be opened with Adobe
®
Acrobat
®
5.0 or later.
- 128-bit AES: Encrypts the file by using the 128-bit AES method. Files encrypted
with this method can be opened with Adobe
®
Acrobat
®
7.0 or later.
- 256-bit AES: Encrypts the file by using the 256-bit AES method. Files encrypted
with this method can be opened with Adobe
®
Acrobat
®
9.0 or later.
• File Open Password: This option sets a password for opening the PDF. The recipient
of the PDF file must know the password before it can be opened.
• Permissions: This option adds restrictions to the PDF file which prevents unauthorized
printing or editing of the file. The recipient of the PDF must know the permissions
password in order to remove these restrictions.
Xerox
®
Color C75 Press6-10
User Guide
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