If you already know what JPEGs and PDFs are then skip to the "Why should you convert JPEG images into PDF documents" section to learn about some of the benefits and advantages of converting your JPEG photographs into
PDF documents.
What is a JPEG?
JPEG (pronounced "jay-peg") is a royalty free image format that was created by a committee known as the Joint Photographics Expert Group. It was designed to compress photographic images so that they take up much less space.
However, the JPEG format is a "lossy" one. This means that when a JPEG image is decompressed it is not quite the same as the original image. But don't worry as this is not a big issue because it is possible to set the quality level that should be used for an image.
At a high quality level the human eye will not be able to distinguish the differences and you will still get a very useful space saving with about a 10:1 compression ratio - ie an image will be compressed to one tenth of their original size.
At medium quality levels you will be able to spot slight differences (known as "compression artifacts") but these should not normally detract from the image and you will get a compression ratio of around 20:1.
Of course lower quality levels are available that allow a compression ratio of 100:1 to be achieved but the resultant images will look very "blocky".
JPEG is probably the most popular image format in use thanks to its high image quality and low space requirements. It is widely used on the Internet and as the storage format for photographs taken with most digital cameras.
What is a PDF?
PDF is a royalty free general purpose Portable Document Format created by Adobe Systems. It is ideal for storing and displaying fixed layout documents in a device and resolution independent way.
What this means is that a PDF document will be displayed in the same way no matter what device it is viewed on - whether it is on a PC with a large screen or on a small personal organizer.
It is also important to note that a PDF document can be printed to any printer and the printed output should look exactly the same (or at least as close as possible subject to any limitations that the printer might have).
What is a JPEG?
JPEG (pronounced "jay-peg") is a royalty free image format that was created by a committee known as the Joint Photographics Expert Group. It was designed to compress photographic images so that they take up much less space.
However, the JPEG format is a "lossy" one. This means that when a JPEG image is decompressed it is not quite the same as the original image. But don't worry as this is not a big issue because it is possible to set the quality level that should be used for an image.
At a high quality level the human eye will not be able to distinguish the differences and you will still get a very useful space saving with about a 10:1 compression ratio - ie an image will be compressed to one tenth of their original size.
At medium quality levels you will be able to spot slight differences (known as "compression artifacts") but these should not normally detract from the image and you will get a compression ratio of around 20:1.
Of course lower quality levels are available that allow a compression ratio of 100:1 to be achieved but the resultant images will look very "blocky".
JPEG is probably the most popular image format in use thanks to its high image quality and low space requirements. It is widely used on the Internet and as the storage format for photographs taken with most digital cameras.
What is a PDF?
PDF is a royalty free general purpose Portable Document Format created by Adobe Systems. It is ideal for storing and displaying fixed layout documents in a device and resolution independent way.
What this means is that a PDF document will be displayed in the same way no matter what device it is viewed on - whether it is on a PC with a large screen or on a small personal organizer.
It is also important to note that a PDF document can be printed to any printer and the printed output should look exactly the same (or at least as close as possible subject to any limitations that the printer might have).
Published by Adrian Nelson
Adrian Nelson is the developer of the highly acclaimed PDF utilities from Utility Warrior (http://www.UtilityWarrior.com) - recently work has started on some iPhone and iPod Touch projects - see web site for... View profile
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