See the ClearImage Common Specification specification for additional details about input output and other specifications.
For imaging purposes two kinds of PDF files are processed by ClearImage PDF I/O:
- Image PDF. Files whose contents is primarily large image objects. Typically produced by scanners and fax servers, such PDFs contain not much else except for the acquired images in black and white, grayscale or color, compressed in the appropriate format. ClearImage simply extracts from these files.
- Data PDF. Files whose contents is primarily text and where the barcodes, if present, are present as text font objects. The kinds files are typically created by publishing or reporting applications. The pages of these files must first be converted into an image, in a process known as "rasterization", in order to make their barcode symbols visible.
| PDF INPUT |
| Input modes |
 Extracts embedded image objects
Rasterizes the PDF pages
Automatic page type identification
  Extract Image - if more than 90% of page is an image object
Rasterize - If less than 90% of the page is an image
|
| Image Extraction controls |
Extracts and decompresses embedded image objects from the
document and makes them available for further operations
Supports all PDF compressions formats
Minimum size can be specified to avoid extracting meaningless
logo's or other trivial images
|
| Pages Rasterization controls |
Specify rendering resolution (DPI) of the page
Specify rendering as color, grayscale or bi-tonal
|
| Color Space Reduction |
Detects embedded images that were scanned as 24 bit color, but
whose contents is either grayscale or black and white
Automatically reduces the color space to 8 bit grayscale or 1 bit bi- tonal bit as appropriate
|
| Meta Data Reading |
Reads PDF metadata: Author, Creator, Keywords, Subject, Title,
CreationDate, Produce, ModDate
|
| PDF OUTPUT |
| Save to PDF |
Creates Image PDF Files
Writes PDF metadata: Author, Creator, Keywords, Subject,
Title, ModDate, CreationDate
|
| Append to PDF |
Appends Images to existing PDF files |
|
