PDFlib Text Extraction Toolkit (TET) Manual

imageFormat = "JPEG";
break;
case 30:
imageFormat = "JPEG2000";
break;
case 40:
imageFormat = "RAW";
break;
case 50:
imageFormat = "JBIG2";
break;
default:
System.err.println("write_image_file() returned unknown value "
+ imageType + ", skipping image, error: "
+ tet.get_errmsg());
}
XMP metadata for images. PDF uses the XMP format to attach metadata to the whole
document or parts of it. You can find more information about XMP and its use in PDF at
the following location: www.pdflib.com/knowledge-base/xmp-metadata/
An image object may have XMP metadata associated with it in the PDF document. If
XMP metadata is present, TET will by default embed it in the extracted image for the
output formats JPEG and TIFF. This behavior can be controlled with the keepxmp option
of TET_write_image_file( ) and TET_get_image_data( ). If this option has been set to false,
TET will ignore image metadata when generating the image output file.
The image_metadata topic in the pCOS Cookbook shows how to extract image metadata
with the pCOS interface directly, without generating any image file.
ICC profiles. An image in PDF may have an associated ICC profile which allows precise
color reproduction. By default, TET processes attached ICC profiles and embeds them in
the generated TIFF or JPEG image files. You can disable ICC profile embedding with the
option keepiccprofile=false in TET_write_image_file( ) and TET_get_image_data( ). This will
reduce the size of the image files at the expense of color fidelity. Disabling ICC profile
embedding is therefore not recommended for workflows which require precise color
representation.
114 Chapter 8: Image Extraction