barcode dll for vb net 10: Putting Pictures on the Screen in Software

Encoding Code 128B in Software 10: Putting Pictures on the Screen

CHAPTER 10: Putting Pictures on the Screen
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Tracing the Origins of the 96/72 ppi Myth (continued)
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Even if display devices could interpret the width/height/output resolution values used for printing, this method of setting display size is based on an outdated formula. We re way past the days when all monitors adhered to the standard of 96 or 72 screen pixels per inch. In addition to a much wider range of monitor sizes, we now have video cards that offer many more screen resolution options, so the number of screen pixels per inch varies widely. On my laptop computer, for example, I have a 12-inch screen that has a viewable area of 10 7 inches. At a screen resolution of 800 600, that means about 80 screen pixels per inch. On my 19-inch monitor, which has a viewable area of 14 10 inches, that same 800 600 setting results in about 57 screen pixels per inch.
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Saving Your Image in a Screen File Format
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After you edit a digital photo, whether it s to adjust the display size or to perform retouching or creative work, you need to save the file in a format that is compatible with programs used to display screen pictures web browsers, e-mail programs, presentation programs such as Microsoft PowerPoint, and the like. A handful of file formats are screen friendly:
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JPEG
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Introduced back in 2, JPEG is the default format used by digital cameras. JPEG is the leading format for web and e-mail photos because it offers file compression, which shrinks download times. Upcoming sections explain more about this format. This format is a web-only creature. Among other things, GIF is used to create GIF animations, those blinking graphics that web designers love and most web users hate. GIF also enables you to make part of your picture transparent, allowing the web page background to show through.
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GIF
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Like JPEG, GIF produces small files, which is what you want in a web format. Unfortunately, GIF images can contain only 256 colors. That s fine for text-based graphics and simple line art, but as illustrated by the GIF example on Page 32 of the color section, a 256-color limit doesn t give you enough shades to reproduce subtle color transitions found in a photograph. The resulting color-block effect is known as posterization.
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GIF may be an option for photos that you convert to the grayscale color mode. Read the upcoming section 256-Color Grayscales: JPEG or GIF for details.
BMP (Windows) and PICT (Macintosh)
These two formats are primarily used for incorporating images into program help systems, screen savers, and other graphics that are displayed by the Windows or Macintosh operating systems. For some of these uses, JPEG works as well, but check your help system to be sure. If BMP or PICT is required for a task, follow the help system s guidelines for choosing specific format options when you save the file.
Most presentation programs also can work with BMP or PICT images. I prefer JPEG, because I can use the same image file for the web or e-mail as well as in the presentation.
PNG and JPEG 2000
Imaging experts are currently developing these two formats, both designed to produce better image quality at smaller file sizes than JPEG and GIF. However, neither of these new players is recognized by older web browsers and e-mail programs, so stay away for now.
Using JPEG Wisely
When you save your photo in the JPEG format, you ll encounter some complex-sounding options. Before I explain them, I need to share some strong words of warning about this format:
As explained in 2, JPEG is a destructive format. JPEG applies compression
to the image, which eliminates picture data to reduce file size. The greater the compression, the more your picture quality suffers. But even the lowest amount of compression does some damage.
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