![]() Ancestry j2k files mac os#Mac OS PDF/A software includes Microsoft Office 2011, OpenOffice, Nuance PDF Converter, and Adobe Acrobat (get Version 8.0 or later).Īnother file format worth noting is JPEG 2000. Ancestry j2k files windows#pdf)-therefore you cannot detect a PDF/A file without examining the metadata that describe it.Ī partial list of PDF/A software for Windows is provided here:Adobe Acrobat (get Version 8.0 or later)soft Xpansion Perfect PDF Master (free for personal use)Nuance PDF ConverterSolid PDF CreatorMicrosoft Office 2007 via its “Save as PDF” plugin (float your cursor over “Save As,” click on “PDF or XPS,” click the “Options…” button, then select “ISO 19005-1 compliant (PDF/A)” under “PDF Options”) Also note that a PDF/A file has the same file extension as a non-archival PDF file (i.e. Nevertheless, PDF/A offers the promise of renderability well into the future.įor more information about PDF/A, see the REFERENCES section. ![]() Since fonts used in the document must be embedded with the content data, the resulting file size will be larger than a corresponding (regular) PDF file. Also, PDF/A does not allow encryption and requires the use of standards-based metadata (i.e., descriptive information). In effect, PDF/A uses a software archiving approach to digital preservation.Ĭombined with the archive-grade storage media described in Part 2 of this series, PDF/A provides a breakthrough in personal archiving! For example, it embeds relevant fonts and color information with the content data so that future computer software will be able to render the document exactly as it can be rendered today. Recognizing the impact of file format obsolescence on digital preservation, the International Organization for Standardization (ISO) defined in 2005 an “electronic document file format for long term preservation.” Based on the Adobe PDF 1.4 format, PDF/A provides a self-contained, self-describing format that is independent of external sources. The first is the PDF/A format (Portable Document Format for Archiving). (Note: JPEG stands for Joint Photographic Experts Group-originators of the JPEG standard.)įortunately, there are file formats that can help overcome both challenges described above. Such JPEG images may be suitable for viewing on a website, but they may disappoint if you try to print them. ![]() JPEG decompression always results in altered file content compared to the original. That’s because JPEG processing does lossy compression of the digital bits-which means that many of them are discarded in order to achieve a significant reduction in file size. Converting a TIFF file to the JPEG format will reduce the size of the file, but the reduction will come at the expense of resolution. For example, if the record is to be printed, print quality will reflect resolution quality of the digital record when you archived it.įor photographs, TIFF (Tagged Image File Format) provides very high resolution, but it also creates large files that consume considerable amounts of archival storage capacity. ![]() And since you don’t know how a record will be used in the future (either by you or your posterity/extended family), resolution can become problematic. The reason is that a digital record’s resolution quality cannot be improved once the digital record is created. When preserving digital family history records, you should always preserve them at the highest resolution you can afford. Anyone attempting to preserve a WordStar document in 1985 would undoubtedly have a difficult time getting his or her personal computer to read it today-even if the storage medium used at the time were still readable!įile size can also be of concern for digital preservation. Today it is effectively “abandonware” (i.e., no longer developed or maintained). To illustrate, in the early and mid-1980s, WordStar was the most popular DOS word processing software in the world. File Format Challenges and SolutionsĪnother challenge of digital preservation has to do with file formats. This part explores in detail challenges of and solutions to file formats. Ancestry j2k files series#Part 2 of this series introduced you to the challenges of digital preservation and discussed solutions to archival storage media challenges. ![]()
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