Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Djvu shopping experience:

1. Compare - without doubt the biggest advantage that the Djvu offers shoppers today is the ability to compare thousands of Djvu at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.

2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about

3. Testimonials - don't know anybody that has bought a Djvu? Wrong! If the Djvu is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.

4. Questions - Got a question about Djvu then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....

5. Reputation - Never heard of the company selling Djvu? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Djvu and build up a picture of their reputation for sales, returns, customer service, delivery etc.

6. Returns - still worried that even after all of the above your Djvu wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.

7. Feedback - happy with your Djvu then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.

8. Security - check for the yellow padlock on the Djvu site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Djvu, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.

10. Payment - ready to pay for your Djvu, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.

{{Infobox file format| name = DjVu| logo = | extension = .djvu, .djv| mime = image/vnd.djvu| type code = DJVU| owner = ATT Research| creatorcode =| genre = Image file formats) is a [computer file format designed primarily to store image scanner images, especially those containing text and line drawings. It uses technologies such as image layer separation of text and background/images, progressive loading, arithmetic coding, and lossy compression for bitonal images. This allows for high quality, readable images to be stored in a minimum of space, so that they can be made available on the World Wide Web.

DjVu has been promoted as an alternative to Portable Document Format, actually outperforming PDF on most scanned documents. The DjVu developers report that color magazine pages compress to 40–70KB, black and white technical papers compress to 15–40KB, and ancient manuscripts compress to around 100KB; all of these are significantly better than the typical 500KB required for a satisfactory JPEG image. Like PDF, DjVu can contain an Optical character recognitioned text layer, making it easy to perform cut and paste and text search operations.

History The DjVu technology was originally developed by Yann Le Cun, Léon Bottou, Patrick Haffner, and Paul G. Howard at AT&T Laboratories in 1996. DjVu is a free file format. The file format specification is published as well as source code for the reference library. The ownership rights to the commercial development of the encoding software have been transferred to different companies over the years, including AT&T and LizardTech. The original authors maintain a GNU General Public License implementation named " DjVuLibre".

DjVu divides a single image into many different images, then compresses them separately. To create a DjVu file, the initial image is first separated into three images: a background image, a foreground image, and a mask image. The background and foreground images are typically lower-resolution color images (e.g., 100dpi); the mask image is a high-resolution bilevel image (e.g., 300dpi) and is typically where the text is stored. The background and foreground images are then compressed using a wavelet-based compression algorithm named IW44. The mask image is compressed using a method called JB2 (similar to JBIG2). The JB2 encoding method identifies nearly-identical shapes on the page, such as multiple occurrences of a particular character in a given font, style, and size. It compresses the bitmap of each unique shape separately, and then encodes the locations where each shape appears on the page. Thus, instead of compressing a letter "e" in a given font multiple times, it compresses the letter "e" once (as a compressed bit image) and then records every place on the page it occurs.

In 2002 the DjVu file format was chosen by the Internet archive as the format in which its Million Book Project provides scanned public domain books online (along with TIFF and PDF).

DjVu format will be used by the One Laptop per Child project in order to easily supply existing paper books in an eBook format. The advantage of DjVu is that it is highly compressed and it does not require any font support.

Comparison of the DjVu and PDF file formats The primary difference between DjVu and PDF is that DjVu is a Raster graphics format, whereas PDF is primarily a Vector graphics format. This difference has several consequences:



The PDF format defines various means to store and render raster images. This capability is often used for representing scanned documents. Such PDF files suffer from the same fundamental limitations as raster formats. The size of these files depends dramatically on the underlying compression scheme. Some PDF compression schemes sometimes approach the performance of DjVu. In principle, DjVu compression could be adapted to represent raster images in PDF files. However there is no momentum for creating such a combination because it pleases neither the proponents of DjVu nor those of PDF.

Both the DjVu and PDF formats define features that do not address the representation of the document appearance but aim at creating a document delivery platform. Both DjVu files and PDF files can be enriched with text, table of contents, hyperlink, and metadata. The PDF format goes further by allowing sounds, interactive forms, and JavaScript programs. The DjVu format defines a protocol to transfer document pages on demand over the Internet. On the other hand, the DjVu format does not specify a way to certify the authenticity of a document or to define Digital Rights Management policies.

Which format to use (DjVu or PDF) With PDF documents one can zoom in on vector-based content to an arbitrary depth or print them at an arbitrarily high resolution without introducing quality loss or jaggedness inherent to raster formats. On the other hand, if a PDF is simply used as a container for non-vector images (such as scans) those images will not gain anything. Another thing to keep in mind is that one can always convert a vector format into a raster format, usually with irrevocable data loss, but the other direction is very difficult.

PDF is most useful when the original source is an electronic document such as a Microsoft Word doc or TeX file. Such documents benefit most from the vector graphics technology that underlies PDF. DjVu files can be marginally smaller but only deliver a high resolution image, possibly enriched with the associated text.

DjVu is very good for image files, and has especially been optimized for scanned text and images. If one has a set of scanned pages from a book or article, DjVu is superior to PDF. However, PDF could be better if the scanned raster images can be transformed into high quality vector graphics, for instance by applying optical character recognition to the scanned image, identifying the fonts, and carefully proofreading the resulting file. This procedure is often undesirable or time/cost prohibitive. Suitable fonts might not be available, or one may want to preserve the original document more exactly, including signatures, marginal comments, paper texture, or other markings. In such cases, DjVu is the better choice.

External links

Editing Tools

Reader Software

{{Infobox file format| name = DjVu| logo = | extension = .djvu, .djv| mime = image/vnd.djvu| type code = DJVU| owner = ATT Research| creatorcode =| genre = Image file formats) is a [computer file format designed primarily to store image scanner images, especially those containing text and line drawings. It uses technologies such as image layer separation of text and background/images, progressive loading, arithmetic coding, and lossy compression for bitonal images. This allows for high quality, readable images to be stored in a minimum of space, so that they can be made available on the World Wide Web.

DjVu has been promoted as an alternative to Portable Document Format, actually outperforming PDF on most scanned documents. The DjVu developers report that color magazine pages compress to 40–70KB, black and white technical papers compress to 15–40KB, and ancient manuscripts compress to around 100KB; all of these are significantly better than the typical 500KB required for a satisfactory JPEG image. Like PDF, DjVu can contain an Optical character recognitioned text layer, making it easy to perform cut and paste and text search operations.

History The DjVu technology was originally developed by Yann Le Cun, Léon Bottou, Patrick Haffner, and Paul G. Howard at AT&T Laboratories in 1996. DjVu is a free file format. The file format specification is published as well as source code for the reference library. The ownership rights to the commercial development of the encoding software have been transferred to different companies over the years, including AT&T and LizardTech. The original authors maintain a GNU General Public License implementation named " DjVuLibre".

DjVu divides a single image into many different images, then compresses them separately. To create a DjVu file, the initial image is first separated into three images: a background image, a foreground image, and a mask image. The background and foreground images are typically lower-resolution color images (e.g., 100dpi); the mask image is a high-resolution bilevel image (e.g., 300dpi) and is typically where the text is stored. The background and foreground images are then compressed using a wavelet-based compression algorithm named IW44. The mask image is compressed using a method called JB2 (similar to JBIG2). The JB2 encoding method identifies nearly-identical shapes on the page, such as multiple occurrences of a particular character in a given font, style, and size. It compresses the bitmap of each unique shape separately, and then encodes the locations where each shape appears on the page. Thus, instead of compressing a letter "e" in a given font multiple times, it compresses the letter "e" once (as a compressed bit image) and then records every place on the page it occurs.

In 2002 the DjVu file format was chosen by the Internet archive as the format in which its Million Book Project provides scanned public domain books online (along with TIFF and PDF).

DjVu format will be used by the One Laptop per Child project in order to easily supply existing paper books in an eBook format. The advantage of DjVu is that it is highly compressed and it does not require any font support.

Comparison of the DjVu and PDF file formats The primary difference between DjVu and PDF is that DjVu is a Raster graphics format, whereas PDF is primarily a Vector graphics format. This difference has several consequences:



The PDF format defines various means to store and render raster images. This capability is often used for representing scanned documents. Such PDF files suffer from the same fundamental limitations as raster formats. The size of these files depends dramatically on the underlying compression scheme. Some PDF compression schemes sometimes approach the performance of DjVu. In principle, DjVu compression could be adapted to represent raster images in PDF files. However there is no momentum for creating such a combination because it pleases neither the proponents of DjVu nor those of PDF.

Both the DjVu and PDF formats define features that do not address the representation of the document appearance but aim at creating a document delivery platform. Both DjVu files and PDF files can be enriched with text, table of contents, hyperlink, and metadata. The PDF format goes further by allowing sounds, interactive forms, and JavaScript programs. The DjVu format defines a protocol to transfer document pages on demand over the Internet. On the other hand, the DjVu format does not specify a way to certify the authenticity of a document or to define Digital Rights Management policies.

Which format to use (DjVu or PDF) With PDF documents one can zoom in on vector-based content to an arbitrary depth or print them at an arbitrarily high resolution without introducing quality loss or jaggedness inherent to raster formats. On the other hand, if a PDF is simply used as a container for non-vector images (such as scans) those images will not gain anything. Another thing to keep in mind is that one can always convert a vector format into a raster format, usually with irrevocable data loss, but the other direction is very difficult.

PDF is most useful when the original source is an electronic document such as a Microsoft Word doc or TeX file. Such documents benefit most from the vector graphics technology that underlies PDF. DjVu files can be marginally smaller but only deliver a high resolution image, possibly enriched with the associated text.

DjVu is very good for image files, and has especially been optimized for scanned text and images. If one has a set of scanned pages from a book or article, DjVu is superior to PDF. However, PDF could be better if the scanned raster images can be transformed into high quality vector graphics, for instance by applying optical character recognition to the scanned image, identifying the fonts, and carefully proofreading the resulting file. This procedure is often undesirable or time/cost prohibitive. Suitable fonts might not be available, or one may want to preserve the original document more exactly, including signatures, marginal comments, paper texture, or other markings. In such cases, DjVu is the better choice.

External links

Editing Tools

Reader Software



DjVu from FOLDOC
DjVu (pronounced like "deja vu") An image compression algorithm and software developped by Yann LeCun 's research ...

DjVu.org - the premier menu for djvu resources
DjVu (pronounced 'déjà vu') is a digital document format with advanced compression technology and high performance value.

What is DjVu - DjVu.org
DjVu (pronounced 'déjà vu') is a digital document format with advanced compression technology and high performance value.

DjVu - Wikipedia, the free encyclopedia
DjVu (pronounced déjà vu) is a computer file format designed primarily to store scanned images, especially those containing text and line drawings.

LizardTech - Press Room - Press Release
LizardTech - Press Room - Press Release ... Celartem Creates New US-Based DjVu Sales and Operations Center in Seattle to Support Its Growing Customer Base

LizardTech - Download
This PocketPC viewer allows users to interactively view MrSID images or DjVu documents within the PocketPC or any other WinCE compliant device.

DjVuLibre: Open Source DjVu library and viewer
Digital document compression technology developed at AT&T. Features GPL open source libraries for simple compression, decompression, and viewing.

LizardTech - Geospatial image compression, manipulation, storage, and ...
DjVu Browser Plug-in ExpressView (MrSID) Plug-in GeoExpress Trial Document Express Trials GeoExpress 6.0 SDK

LizardTech - Download Homepage
LizardTech - Download Homepage - Here you will find FREE plug-ins and viewers for viewing MrSID images and DjVu documents as well as useful tools, utilities, filters, updates, SDK ...

192.com - Family Records
Downloads. DjVu Viewer Plug-in. The DjVu viewer plug-in for Microsoft Internet Explorer, Firefox, Netscape Navigator and Safari is the primary means of viewing DjVu documents.

 

Djvu



 
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