Other General Properties in Java

Creation Code39 in Java Other General Properties
22 Other General Properties
Print Code 39 Full ASCII In Java
Using Barcode generation for Java Control to generate, create Code 39 Full ASCII image in Java applications.
This section describes other notable general properties of PDF, aside from its imaging model
Paint Bar Code In Java
Using Barcode encoder for Java Control to generate, create barcode image in Java applications.
221 Portability
Bar Code Decoder In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
PDF les are represented as sequences of 8-bit binary bytes A PDF le is designed to be portable across all platforms and operating systems The binary rep-
Printing Code 3/9 In Visual C#.NET
Using Barcode maker for Visual Studio .NET Control to generate, create Code 39 Full ASCII image in .NET framework applications.
S E CTIO N 2 2
Paint Code 39 In VS .NET
Using Barcode generation for ASP.NET Control to generate, create Code 3 of 9 image in ASP.NET applications.
Other General Properties
Make ANSI/AIM Code 39 In VS .NET
Using Barcode creator for VS .NET Control to generate, create USS Code 39 image in .NET framework applications.
resentation is intended to be generated, transported, and consumed directly, without translation between native character sets, end-of-line representations, or other conventions used on various platforms Any PDF le can also be represented in a form that uses only 7-bit ASCII (American Standard Code for Information Interchange) character codes This is useful for the purpose of exposition, as in this book However, this representation is not recommended for actual use, since it is less ef cient than the normal binary representation Regardless of which representation is used, PDF les must be transported and stored as binary les, not as text les; inadvertent changes, such as conversion between text end-of-line conventions, will damage the le and may render it unusable
Generating USS Code 39 In VB.NET
Using Barcode encoder for VS .NET Control to generate, create Code 39 Extended image in .NET applications.
222 Compression
Generate Barcode In Java
Using Barcode creation for Java Control to generate, create barcode image in Java applications.
To reduce le size, PDF supports a number of industry-standard compression lters:
Making Code 39 Extended In Java
Using Barcode maker for Java Control to generate, create Code 39 Full ASCII image in Java applications.
JPEG compression of color and grayscale images CCITT (Group 3 or Group 4), run-length, and (in PDF 14) JBIG2 compression of monochrome images
Paint EAN-13 In Java
Using Barcode encoder for Java Control to generate, create EAN-13 Supplement 5 image in Java applications.
LZW (Lempel-Ziv-Welch) and (beginning with PDF 12) Flate compression of
Barcode Drawer In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
text, graphics, and images Using JPEG compression, color and grayscale images can be compressed by a factor of 10 or more Effective compression of monochrome images depends on the compression lter used and the properties of the image, but reductions of 2:1 to 8:1 are common (or 20:1 to 50:1 for JBIG2 compression of an image of a page full of text) LZW or Flate compression of the content streams describing all other text and graphics in the document results in compression ratios of approximately 2:1 All of these compression lters produce binary data, which can then be further converted to ASCII base-85 encoding if a 7-bit ASCII representation is desired
Paint EAN / UCC - 14 In Java
Using Barcode printer for Java Control to generate, create UCC-128 image in Java applications.
223 Font Management
Printing USPS Confirm Service Barcode In Java
Using Barcode encoder for Java Control to generate, create USPS PLANET Barcode image in Java applications.
Managing fonts is a fundamental challenge in document interchange Generally, the receiver of a document must have the same fonts that were originally used to
DataMatrix Encoder In Visual Basic .NET
Using Barcode generation for VS .NET Control to generate, create DataMatrix image in .NET framework applications.
CHA P TE R 2
Code 128C Generator In Visual Studio .NET
Using Barcode drawer for ASP.NET Control to generate, create Code 128 image in ASP.NET applications.
Overview
Barcode Recognizer In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
create it If a different font is substituted, its character set, glyph shapes, and metrics may differ from those in the original font This can produce unexpected and undesirable results, such as lines of text extending into margins or overlapping with graphics PDF provides various means for dealing with font management:
Barcode Printer In .NET
Using Barcode creation for ASP.NET Control to generate, create bar code image in ASP.NET applications.
The original font programs can be embedded in the PDF le PDF supports
Read Bar Code In .NET Framework
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET applications.
various font formats, including Type 1, TrueType , and CID-keyed fonts This ensures the most predictable and dependable results
EAN / UCC - 13 Encoder In .NET
Using Barcode maker for ASP.NET Control to generate, create EAN 13 image in ASP.NET applications.
To conserve space, a font subset can be embedded, containing just the glyph
Printing GS1-128 In VS .NET
Using Barcode generation for ASP.NET Control to generate, create GS1-128 image in ASP.NET applications.
descriptions for those characters that are actually used in the document Also, Type 1 fonts can be represented in a special compact format
PDF prescribes a set of 14 standard fonts that can be used without prior de nition These include four faces each of three Latin text typefaces (Courier, Helvetica*, and Times*), as well as two symbolic fonts (Symbol and ITC Zapf Dingbats ) These fonts, or suitable substitute fonts with the same metrics, are guaranteed to be available in all PDF viewer applications
A PDF le can refer by name to fonts that are not embedded in the PDF le In
this case, a viewer application will use those fonts if they are available in the viewer s environment This approach suffers from the uncertainties noted above
A PDF le contains a font descriptor for each font that it uses (other than the
standard 14) The font descriptor includes font metrics and style information, enabling a viewer application to select or synthesize a suitable substitute font if necessary Although the glyphs shapes will differ from those intended, their placement will be accurate Font management is primarily concerned with producing the correct appearance of text that is, the shape and placement of glyphs However, it is sometimes necessary for a PDF application to extract the meaning of the text, represented in some standard information encoding such as Unicode In some cases, this information can be deduced from the encoding used to represent the text in the PDF le Otherwise, the PDF producer application should specify the mapping explicitly by including a special object, the ToUnicode CMap