how to generate barcode in vb.net 2010 2: Exploring Creative Controls in Software

Maker Code-128 in Software 2: Exploring Creative Controls

CHAPTER 2: Exploring Creative Controls
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Technically speaking, the compression question has an easy answer: For maximum quality, use the setting that applies the least compression and stock up on extra memory cards to hold the larger image files you will create. However, depending on the camera, you may not notice a huge difference in picture quality when you apply moderate JPEG compression, and you can reduce file size dramatically. Take a look at the top pair of images on Page 5 of the color insert, for example. The left image shows the uncompressed TIFF version of the stamp picture, which has a file size of 18MB. The right image shows the same subject captured at a JPEG compression ratio of about 7:1. It s difficult to detect any significant quality loss in the compressed version, and the file size plunges to 2.4MB. To find out how much compression your pictures can take before they start to fall apart, shoot some test shots at each of the available settings and compare the pictures at different print and screen display sizes. Work with a subject that offers both high-contrast details, such as the lettering in the stamps, and areas of subtle color changes, such as the faces. Remember, too, that resolution and compression work in tandem to determine picture quality and file size. As you can see from the examples on Page 5 of the color insert, you can achieve similar file sizes but slightly different image quality. One final compression caveat: If you re creating photos for the web or some other on-screen use and you plan to make any alterations to the pictures in your photo editor, opt for minimal camera compression. After editing, you ll need to resave your pictures in the web-friendly JPEG format, which applies another round of compression and degrades image quality further.
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When a shortage of camera memory forces me to choose between a high-resolution, highly compressed image and a moderate-resolution, lightly compressed image, I opt for fewer pixels and less compression. In my experience, compression causes a more noticeable loss of image quality than a shortage of pixels. Note that for prints, the term moderate resolution is key if you drop too low in relation to your desired print size, you ll wind up with a stair-stepping effect that s every bit as ugly as compression artifacts.
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A half dozen or so data file formats have been created to store digital images, but only three are widely used in digital cameras:
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Named for the Joint Photographic Experts Group, the organization that created the format, JPEG is the default format on most cameras.
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TIFF
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Short for Tagged Image File Format, TIFF has been the leading image format for print publications for years but has just recently appeared as an option on mid- to high-resolution cameras. Typically available only on high-end cameras, this option gives you just what its name implies: a raw, uncooked file. When you select the RAW format, the camera records the image without any of the processing that typically occurs sharpening and white-balancing, for example.
RAW
Few cameras offer all three formats or even a choice other than JPEG. If your camera is limited in this regard, don t be too worried JPEG is a perfectly acceptable format.
Creative Impact
From a creative standpoint, each of the three image file formats has its pros and cons.
JPEG applies lossy compression, which shrinks file size but also reduces image
quality. (See the earlier section Compression for more information.) On the plus side, because JPEG is also an Internet format, you can upload pictures directly from the camera to the web or e-mail.
TIFF files may also be compressed. But because TIFF uses lossless compression,
top picture quality is retained. However, file sizes are much larger than with JPEG, and TIFF images aren t Internet-ready.
RAW appeals to purists who don t want the camera handling any image processing,
even if that processing makes the picture look better (which it usually does). Most photo-editing and cataloging programs can t open RAW files, however, and no web browsers or e-mail programs can handle them, either. So you need to use the camera manufacturer s proprietary software to translate the files to TIFF or JPEG before you can do much of anything with them. In addition, RAW applies no compression at all, so file sizes are large, as with TIFF.
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