PDF Setup Window - General Tab
Use the General tab to select the compression format for images in PDF output, and if applicable, the level of PDF/A compliance to apply for long-term document preservation.
Compression Format
Use the Compression Format list to select an image compression format (CCITT4, JPEG, or JPEG2000) for PDF output. Compression reduces file sizes and the space required to store files.
By default, the selection is JPEG, which is supported for color and grayscale images. If you are processing bitonal images while JPEG is selected, CCITT4 is used instead.
If you select PDF/A as the export file type, the JPEG2000 format is not supported.
PDF/A Compliance Level
When the export file type is set to PDF/A, use the General tab to specify the level of PDF/A compliance to apply. Use the following table to determine the appropriate level of compliance.
PDF/A Compliance
|
Compliance level |
Description |
|---|---|
|
PDF/A-1a |
Supports long-term storage of digital documents and fully satisfies the requirements in the ISO 19005-1 specification. Readable by any PDF reader that conforms to PDF 1.4, or later. |
|
PDF/A-1b |
Offers the same level of compliance as PDF/A-1a and satisfies the minimal requirements in the ISO 19005-1 specification. |
|
PDF/A-2a |
Offers the same level of compliance as PDF/A-1a, and adds support for JPEG 2000 compression to generate reduced file sizes. Satisfies the requirements in the ISO 19005-2 specification. Readable by any PDF reader that conforms to PDF 1.7. |
|
PDF/A-2u |
Offers the same level of compliance as PDF/A-2a, and adds the ability to extract text in Unicode. |
|
PDF/A-3a |
Permits the embedding of another PDF/A file or a binary file format (such as XML or Microsoft Office) within the PDF/A file. Satisfies the requirements in the ISO 19005-3 specification. Otherwise, the same as PDF/A-2a. With PDF/A-3a compliance, only the PDF/A file, rather than any embedded file, should be considered for archiving purposes. |
|
PDF/A-3u |
Offers the same level of compliance as PDF/A-3a, and adds the ability to extract text in Unicode. |