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• ÃÙ»ÀÒ¾ raster
• ÃÙ»ÀÒ¾ vector



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ÃÙ»ÀÒ¾ÃٻẺ: ÃÙ»ÀÒ¾ Raster

bmp: ºÔµáÁ» Windows

ºÔµáÁ»¢Í§ windows à¡çºÃÙ» raster à´ÕÂÇ㹤ÇÒÁÅÖ¡ã´ æ ÊÕ ¨Ò¡ÊÕ¢ÒÇ´Ó 24-ºÔµ ÃٻẺá¿éÁºÔµáÁ» Windows ¨Ðà¢éҡѹä´é¡Ñºâ»Ãá¡ÃÁÍ×è¹ æ ¢Í§ Microsoft Windows ¤Ø³äÁèʹѺʹع¡ÒúպÍÑ´á¿éÁ áÅÐäÁèàËÁÒÐÊÁÊÓËÃѺàÇçºà¾¨

¢éÍàÊÕ¢ͧÃٻẺá¿éÁºÔµáÁ» Windows overall, outweigh ¢éÍ´Õ ÊÓËÃѺÃÙ»¶èÒ¤سÀÒ¾¢Í§ ãªéá¿éÁ PNG á¿éÁ JPEG ËÃ×Íá¿éÁ TIFF á¿éÁ bmp ¨ÐàËÁÒÐÊÁ¡ÑºÃÙ»¾×é¹ËÅѧ㹠Windows

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• ʹѺʹعá¿éÁ bmp 1 ºÔµ¶Ö§¤ÇÒÁÅÐàÍÕ´¢Í§ÊÕ 24 ºÔµ
• ÃٻẺá¿éÁ BMP äÁèà¢éҡѹä´é¡Ñº Windows ·ÕèÁÕÍÂÙèµèÒ§ æ â»Ãá¡ÃÁ â»Ãá¡ÃÁ·Õèà¡èÒ¡ÇèÒâ´Â੾ÒÐ

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• á¿éÁ bmp äÁèʹѺʹع¡ÒúպÍÑ´ «Öè§Ê觼Åã¹á¿éÁ·ÕèÁÕ¢¹Ò´ãË­èÁÒ¡
• á¿éÁ bmp äÁèä´éÃѺ¡ÒÃʹѺʹع¨Ò¡àÇçºàºÃÒÇìà«ÍÃì

PCX: Paintbrush ¾Õ«Õ

ÊÔè§ÊӤѭÃٻẺá¿éÁ PCX à·èÒ¹Ñé¹ä´éÃѺ¡ÒÃʹѺʹعã¹Ãкº Office 2003 ¨ÐäÁè¶Ù¡Ê¹ÑºÊ¹Ø¹ã¹Ãкº Office 2007 ËÃ×ÍÃкº Office ÃØè¹·ÕèãËÁè¡ÇèÒ

ÃÙ»ÀÒ¾¾Õ«Õ Paintbrush ¡ÒÃàÃÕ¡ÍÕ¡ ÍÂèÒ§ÇèÒºÔµáÁ» Z Soft à¡çºÃÙ» raster à´ÕÂÇ·ÕèÁÕ¤ÇÒÁÅÐàÍÕ´¢Í§ÊÕ ÃÙ»ÀÒ¾ paintbrush ¨Ðãªéã¹â»Ãá¡ÃÁ¢Í§ Windows ÃØ蹡è͹˹éÒáÅÐâ»Ãá¡ÃÁ-DOS ãªéâ»Ãá¡ÃÁµèÒ§ æ ÁÒ¡¢Öé¹ ÃÙ»ÀÒ¾ paintbrush ·Õèà¢éҡѹä´é¡ÑºËÅÒÂâ»Ãá¡ÃÁã¹ÀÒÂËÅѧä´é ÃÙ»ÀÒ¾ PCX ʹѺʹع¤ÇÒÁÂÒÇ·ÕèàÃÕ¡ãªé¡ÒúպÍÑ´ÀÒÂ㹢ͧà¢éÒÃËÑÊ (RLE)

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• PCX ¤×Í ÃٻẺÁҵðҹ¼èÒ¹â»Ãá¡ÃÁµèÒ§ æ ·Õèãªé Windows áÅÐâ»Ãá¡ÃÁ-DOS ãªéâ»Ãá¡ÃÁ¨Ó¹Ç¹ÁÒ¡
• PCX ʹѺʹع¡ÒúպÍÑ´ÀÒÂã¹

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• PCX äÁèä´éÃѺ¡ÒÃʹѺʹع¨Ò¡àÇçºàºÃÒÇìà«ÍÃì

png: ÃÙ»ÀÒ¾¢Í§à¤Ã×Í¢èÒ·ÕèẺ¾¡¾Ò

PNG pictures store a single raster image at any color depth. PNG is a platform-independent format.

Advantages:

• PNG supports high-level lossless compression.
• PNG supports alpha channel transparency.
• PNG supports gamma correction.
• PNG supports interlacing.
• PNG is supported by more recent Web browsers.

Disadvantages:

• Older browsers and programs may not support PNG files.
• As an Internet file format, PNG provides less compression than the lossy compression of JPEG.
• As an Internet file format, PNG offers no support for multi-image files or animated files. The GIF format supports multi-image files and animated files.

JPEG: Joint Photographic Experts Group

JPEG pictures store a single raster image in 24-bit color. JPEG is a platform-independent format that supports the highest levels of compression; however, this compression is lossy. Progressive JPEG files support interlacing.

The level of JPEG file compression can be increased or decreased. However, image quality is sacrificed for file size. The compression ratio can be as high as 100:1. (The JPEG format comfortably compresses files at a 10:1 to 20:1 ratio, with little picture degradation.) JPEG compression works well with photo-realistic artwork. However, for simpler artwork with fewer colors, sharp levels of contrast, solid borders, or large solid areas of color, JPEG compression does not provide superior results. Sometimes the compression ratio is as low as 5:1, with a high loss of picture integrity. This loss occurs because the JPEG compression scheme compresses similar hues well. But the JPEG compression scheme does not work as well with sharp differences in brightness or with solid areas of color.

Advantages:

• Superior compression is supported for photographic artwork or realistic artwork.
• Variable compression allows control of the file size.
• Interlacing (for Progressive JPEG files) is supported.
• JPEG is a widely supported Internet standard.

Disadvantages:

• Lossy compression degrades the original picture data.
• When you edit and resave JPEG files, JPEG compounds the degradation of the original picture data. This degradation is cumulative.
• JPEG is not suitable for simpler pictures that contain few colors, broad areas of similar color, or stark differences in brightness.

GIF: Graphics Interchange Format

GIF pictures store single raster image data or multiple raster image data in 8-bits, or 256 colors. GIF pictures support transparency, compression, interlacing, and multiple-image pictures (animated GIFs).

GIF transparency is not alpha channel transparency and cannot support semitransparent effects. GIF compression is LZW compression, at a roughly 3:1 ratio. Animated GIFs are supported in the GIF89a version of the GIF file specification.

Advantages:

• GIF is a widely supported Internet standard.
• Lossless compression and transparency are supported.
• Animated GIFs are prevalent and easy to create with many GIF animation programs.

Disadvantages:

• GIF supports only a 256-color palette; therefore, detailed pictures and photo-realistic images lose color information and look paletted.
• Lossless compression is inferior to the JPEG format or the PNG format, in most cases.
• GIF supports limited transparency and no semitransparent effects or faded effects, such as those that are provided by alpha channel transparency.

TIFF: Tagged Image File Format

TIFF pictures store a single raster image at any color depth. TIFF is arguably the most widely supported graphics file format in the printing industry. TIFF supports optional compression and is not suitable for viewing in Web browsers.

The TIFF format is an extensible format. This means that a programmer can modify the original specification to add functionality or to meet specific needs. Modifying the specification can lead to incompatibilities between different types of TIFF pictures.

Advantages:

• TIFF is a widely supported format, especially between Macintosh computers and Windows-based computers.
• Optional compression is supported.
• The extensible format supports many optional features.

Disadvantages:

• TIFF is not supported by Web browsers.
• Extensibility results in many different types of TIFF pictures. Not all TIFF files are compatible with all programs that support the baseline TIFF standard.

Picture formats: Vector pictures

DXF: AutoCAD Drawing Interchange File

The DXF format is a vector-based, ASCII format that the Autodesk AutoCAD program uses. AutoCAD provides highly detailed schematics that are completely scalable.

Advantages:

• AutoCAD allows you to create highly detailed and precise schematics and drawings.
• AutoCAD files are popular in the architectural, design, and engraving industries.

Disadvantages:

• AutoCAD has limited support in Office, which supports AutoCAD versions up through R12.
• AutoCAD ä´éàÃÕ¹ÃÙé·ÕèÇÒ´àÊé¹â¤é§ steep â»Ã´ÊѧࡵÇèÒ â»Ãá¡ÃÁ¡ÃÒ¿Ô¡Í×è¹ æ ¹Í¡¨Ò¡¹ÕéÂѧÊÒÁÒöÊè§ÍÍ¡ÃÙ»ÀÒ¾ DXF

cgm: Metafile ¡ÃÒ¿Ô¡¤ÍÁ¾ÔÇàµÍÃì

»ÃСͺ´éÇ CGM metafile vector ¢éÍÁÙÅáÅТéÍÁÙźԵáÁ» ÃٻẺá¿éÁ internationally Áҵðҹ·Õèãªé â´Âͧ¤ì¡Ã¨Ó¹Ç¹ÁÒ¡áÅÐ˹èǧҹÃÑ°ºÒÅ ÃÇÁ·Ñ駡ÒÃÍѧ¡ÄÉÁҵðҹ Institute (BSI), ¡ÒÃÍàÁÃÔ¡ÒªÒµÔÁҵðҹ Institute (ANSI), áÅÐã¹ÊËÃÑ°ÍàÁÃÔ¡Òá¼¹¡¡Òûéͧ¡Ñ¹ ä´é
ËÁÒÂà˵Ø:ã¹ Office 2007 ÃٻẺá¿éÁ¡ÃÒ¿Ô¡ CGM ¨Óà»ç¹µéͧãªéµÑÇ¡Ãͧ¡ÃÒ¿Ô¡

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• cgm ¤×Í ÃٻẺÁҵðҹÊÒ¡Å

CDR: CorelDRAW

CorelDRAW ! metafile ÊÒÁÒö»ÃСͺ´éÇ¢éÍÁÙÅ vector áÅкԵáÁ»¢éÍÁÙÅä´é
ËÁÒÂà˵Ø:ã¹ Office 2007 ÃٻẺá¿éÁ¡ÃÒ¿Ô¡ CDR ¨Óà»ç¹µéͧãªéµÑÇ¡Ãͧ¡ÃÒ¿Ô¡

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• CDR µèÒ§ æ ãªéã¹ÍصÊÒË¡ÃÃÁ prepress áÅÐÍصÊÒË¡ÃÃÁºÃÔº·¢Í§ÈÔŻСÒÃÍ͡Ẻ

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• CDR ÁÕ¨Ó¡Ñ´¡ÒÃʹѺʹع㹠Office «Öè§Ê¹ÑºÊ¹Ø¹ CorelDRAW ! ÃØè¹ 6 áÅÐÃØ蹡è͹˹éÒ

wmf: Metafile Windows

Windows Metafile à»ç¹áºº 16 ºÔµ metafile ·Õè»ÃСͺ´éÇ¢éÍÁÙÅ vector áÅТéÍÁÙźԵáÁ» ¨Ðä´éÃѺ¡ÒÃÍ͡ẺÊÓËÃѺÃкº»¯ÔºÑµÔ¡Òâͧ Windows

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• wmf ¤×Í Windows ẺÁҵðҹ·Õèãªé§Ò¹ä´é´Õ¡Ñº Office

EPS: PostScript ¡ÒÃÊÃØ»

ÃٻẺ Encapsulated PostScript äÁèà»ç¹Å¡ÃÃÁÊÔ·¸Ôì à¤Ã×èͧ¾ÔÁ¾ì¤Ó͸ԺÒÂà¡ÕèÂǡѺÀÒÉÒ·ÕèÊÒÁÒö͸ԺÒÂÃÒÂÅÐàÍÕ´ vector áÅТéÍÁÙźԵáÁ»
ËÁÒÂà˵Ø:ã¹ Office 2007 ÃٻẺá¿éÁ¡ÃÒ¿Ô¡ EPS ¨Óà»ç¹µéͧãªéµÑÇ¡Ãͧ¡ÃÒ¿Ô¡

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• EPS ËÒ¡µéͧ¡ÒÃáÊ´§¶Ù¡µéͧº¹ PostScript ã´ æ ·ÕèÊÃéÒ§à¤Ã×èͧ¾ÔÁ¾ì
• EPS ¤×Í ÃٻẺÁҵðҹÍصÊÒË¡ÃÃÁ

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• º¹Ë¹éÒ¨ÍáÊ´§ÍÒ¨äÁèµÃ§¡Ñº¡ÒÃáÊ´§¡ÒþÔÁ¾ìä´é º¹Ë¹éÒ¨ÍáÊ´§ÍÒ¨ low-resolution ÃÙ»ÀÒ¾·ÕèᵡµèÒ§¡Ñ¹ ËÃ×Í੾ÒеÑÇÂÖ´ÃÙ»ä´é
• á¿éÁ EPS ¨Ðä´éÃѺ¡ÒÃÍ͡Ẻ·Õè¨Ð¾ÔÁ¾ì ¨ÐäÁè¨Ñ´ÃٻẺ·ÕèàËÁÒÐÊÁ·ÕèÊش㹡ÒÃáÊ´§¢éÍÁÙź¹Ë¹éÒ¨Í

EMF: Metafile ·Õèà¾ÔèÁ¢Öé¹

ÃٻẺ¢Ñé¹ÊÙ§ Metafile ¤×Í ÃٻẺ 32 ºÔµ·Õè»ÃСͺ´éÇ¢éÍÁÙÅ vector áÅТéÍÁÙźԵáÁ» ÃٻẺ¹Õé¶Ù¡»ÃѺ»Ãا·Õè¼èÒ¹¡ÒèѴÃٻẺ¡Òà Metafile Windows áÅлÃСͺ´éǤسÅѡɳÐà¾ÔèÁàµÔÁ àªè¹µèÍ仹Õé:

• ¢éÍÁÙÅ scaling ·ÕèÁÕÍÂÙèáÅéÇ
• ¤Ó͸ԺÒÂã¹µÑÇ·ÕèºÑ¹·Ö¡äÇé¡Ñºá¿éÁ
• »ÃѺ»Ãا㹠palettes ÊÕáÅÐ independence ÍØ»¡Ã³ì

ÃٻẺ EMF ¤×Í extensible ÃٻẺ «Öè§ËÁÒ¤ÇÒÁ ÇèÒ à»ç¹â»Ãá¡ÃÁàÁÍÃìÊÒÁÒö»ÃѺà»ÅÕè¹¢éÍÁÙŨÓà¾Òе鹩ºÑº à¾×èÍà¾ÔèÁ¿Ñ§¡ìªÑ¹¡Ò÷ӧҹ ËÃ×͵ÒÁ·Õèµéͧ »ÃѺà»ÅÕè¹¹ÕéÊÒÁÒö¹Óä» incompatibilities ÃÐËÇèÒ§ª¹Ô´¢Í§ÃÙ»ÀÒ¾ EMF

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• ÃٻẺá¿éÁ extensible
• ¤Ø³ÅѡɳзÕè»ÃѺ»Ãا·Õèà»ÃÕºà·Õº¡Ñº WMF

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• ËÅÒª¹Ô´µèÒ§ æ EMF extensibility ¼ÅÃÙ»ÀÒ¾ á¿éÁ EMF äÁè·Ñé§ËÁ´à¢éҡѹä´é¡Ñºâ»Ãá¡ÃÁ·Ñé§ËÁ´·ÕèʹѺʹعÁҵðҹ EMF

PICT: ÃÙ»ÀÒ¾¢Í§ Macintosh

á¿éÁ PICT ¤×Í ÃٻẺ 32 ºÔµ metafile ÊÓËÃѺ Macintosh ¤ÍÁ¾ÔÇàµÍÃì PICT á¿éÁãªé¡ÒúպÍÑ´àÃÕ¡ãªé¤ÇÒÁÂÒÇà¢éÒÃËÑÊ (RLE) ÀÒÂã¹¢éÍÁÙÅ «Öè§ reasonably ´éÇ¡Ò÷ӧҹ á¿éÁ PICT ʹѺʹع¡ÒúպÍÑ´ JPEG ¶éÒÁÕ¡ÒõԴµÑé§ QuickTime(macintosh à·èÒ¹Ñé¹).
ËÁÒÂà˵Ø:ã¹ Office 2007 ÃٻẺá¿éÁ¡ÃÒ¿Ô¡ PICT ¨Óà»ç¹µéͧãªéµÑÇ¡Ãͧ¡ÃÒ¿Ô¡

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• PICT äÁèàËÁÒÐÊÁ·ÕèÊØ´á¿éÁÃٻẺÊÓËÃѺº¹Ë¹éÒ¨ÍáÊ´§¼Åº¹¤ÍÁ¾ÔÇàµÍÃì Macintosh
• PICT ¤×Í ÃٻẺ¡ÒþÔÁ¾ì·Õè´Õ·ÕèÊØ´¨ÐãªéàÁ×èͤس¾ÔÁ¾ì¨Ò¡¤ÍÁ¾ÔÇàµÍÃì Macintosh ä»Âѧà¤Ã×èͧ¾ÔÁ¾ìäÁèãªè PostScript

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• ẺÍÑ¡ÉÃÍÒ¨¨ÐáÊ´§ÍÂèÒ§äÁè¶Ù¡µéͧàÁ×èÍÁÕá¾Åµ¿ÍÃìÁËÇèÒ§·ÕèÂéÒÂ
• quicktime µéͧ¶Ù¡µÔ´µÑé§àÁ×è͵éͧ¡ÒôÙá¿éÁ PICT ºÒ§ÍÂèÒ§¶Ù¡µéͧ

¤ÇÒÁÅÖ¡·Õè¤ÇÒÁÅÐàÍÕ´áÅÐÊÕ

Êèǹ¹Õé͸ԺÒ¤ÇÒÁÅÐàÍÕ´¢Í§ÊÕ·ÕèàËÁÒÐÊÁáÅФÇÒÁÅÐàÍÕ´¢Í§ÃÙ»ÀÒ¾ raster ¶éҤسºÑ¹·Ö¡ÃÙ»ÀÒ¾ ´éǤÇÒÁÅÐàÍÕ´·Õè¶Ù¡µéͧáÅСÒõÑ駤èÒÊÕ ¤Ø³ÊÃéÒ§á¿éÁ¢¹Ò´àÅç¡ á¿éÁ·ÕèàÅç¡¡ÇèÒËÁÒ¶֧ àÍ¡ÊÒ÷ÕèÁÕ¢¹Ò´àÅç¡ ÃÇ´àÃçÇ¢Öé¹áÅЧҹ¹ÓàÊ¹Í ÍÂÙèã¹´Í¡àºÕé·Õè´Õ·ÕèÊØ´¢Í§¤Ø³à¾×èÍ·ÓãËéÃÙ»ÀÒ¾¢¹Ò´àÅç¡ÁÒ¡·ÕèÊØ´ ¹ÕéÀÒÂã¹¢éÍ¡Ó˹´¢Í§¡ÒÃãªéÃÙ»ÀÒ¾¢Í§¤Ø³

¡ÒÃáÊ´§¼Åº¹Ë¹éÒ¨Í

ËÁÒÂà˵Ø:Microsoft recommends a resolution of 72 pixels per inch, because most monitors have between 60 pixels and 80 pixels per inch. Saving at a higher resolution does not result in a higher-quality display, because your monitor cannot display more pixels than physically exist in the monitor. You should calculate the points per inch according to the completed size of your picture, not the original size. For example, if you are scanning an 8.5-by-2-inch letterhead for use on a Web page with a completed width of 2 inches, you can scan at 72 ppi for 2 inches, for a total of 144 pixels. The resulting file looks great when it is sized to 2 inches and is displayed on a monitor.

* ËÁÒÂà˵ØAt 256 colors, JPEG files offer a higher level of compression than GIF files do. However, JPEG compression does not compress some simple files as effectively as GIF compression does.

• If your picture is grayscale, has large areas of one solid color, or has areas of high contrast (sharp differences between light areas and dark areas), choose the GIF format.
  
  
• If your picture is in color and contains several different colors (hues) that are similar in lightness or darkness (value), choose the JPEG format, because JPEG offers better compression. JPEG compression works according to hue and works well with different hues of a similar value. JPEG compression does not work as well with similar hues at different values.

Printed output

How to create good printed output is a complex subject, because of the vast number of printers that are available and the capability of each printer to produce color output and grayscale output. The primary factor for good printed output is the number of lines per inch (LPI) that your printer is capable of printing.

To print in color or grayscale, a printer must print in halftones. Halftones are arrays of dots that are arranged in a grid and that represent each image pixel as a shade of gray. For a dark gray, most of the dots in the grid are filled in. For a light gray, only a few dots on the grid are filled in. The LPI setting for the printer determines the size of this grid. The higher the LPI, the smaller the grid, and the fewer shades of gray the printer can render.

To print in color, the printer must print overlapping lines of colored dots. Each dot is set at a different angle from the other dots and is slightly offset, so that the dots do not completely cover each other. This measurement is known as the Screen Frequency and is represented in degrees of rotation of the lines of dots that make up that color.

The following table helps you to choose the optimum resolution for scanning, in dots per inch (dpi).



To calculate your target scanning resolution, you can multiply the LPI of your printer by two. This is a general rule. To find out the LPI of your printer, see your printer documentation.

ËÁÒÂà˵Ø:You must experiment when you apply the general rule of multiplying the LPI by two. Some printers support very high resolutions. If you save your picture at more than 300 ppi, larger pictures may take up large amounts of disk space and may slow down other operations on your computer. Multiple large pictures in a document can cause a program to stop responding or can cause Windows to stop responding.

The only exception to this rule is pure black-and-white images, or "line art" images. These images use 1 bit to store color information. Scan these images at a 1-to-1 ratio. If you have a 600 dpi printer, scan these images at 600 ppi in Line Art mode.

¶éҤسµéͧ¡ÒÃãËéÃÙ»ÀÒ¾¢Í§¤Ø³ÍÂÙèã¹ grayscale ËÃ×ÍÁÕ¹éÍ¡ÇèÒ 256 ÊÕ ãªéÃٻẺ TIFF ËÃ×ÍÃٻẺ GIF ÃٻẺ TIFF ¤×Í Áҵðҹ¢Í§ÍصÊÒË¡ÃÃÁ¾ÔÁ¾ì¡ÃÒ¿Ô¡ à¹×èͧ¨Ò¡ÃٻẺ TIFF äÁèãªéªØ´ÃٻẺ¢Í§¡ÒúպÍÑ´ lossy ÃٻẺÍ×è¹ àªè¹ JPEG ãªéªØ´ÃٻẺ¢Í§¡ÒúպÍÑ´ lossy ÃٻẺ tiff ʹѺʹعËÅÒÂÃдѺ¢Í§¤ÇÒÁâ»Ãè§ãÊ «Ö觷ÓÃٻẺÍ×è¹ æ ºÒ§ÍÂèÒ§

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  • 32 ºÔµ - ÊÕ True ÊÕ 4,294,967,296
• ºÕºÍÑ´: ºÕºÍÑ´ÁÕâ¤Ã§ÃèÒ§·Ò§¤³ÔµÈÒʵÃì·Õè·ÓãËéá¿éÁÃÙ»ÀÒ¾ÁÕ¢¹Ò´àÅç¡ â´Â¡ÒÃàÍÒ¢éÍÁÙÅ·Õè«éÓ«é͹ ÁÕÍÂÙèÊͧª¹Ô´¢Í§¡ÒúպÍÑ´: lossless áÅÐ lossy
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• ºÕºÍÑ´ lossy: ¡ÒúպÍÑ´ lossy à»ç¹ªØ´ÃٻẺ¡ÒúպÍÑ´·Õè emphasizes ¼ÅÔµá¿éÁÃÙ»ÀÒ¾¢¹Ò´àÅç¡ áÁéáµèã¹·Õè cost ¢Í§¤Ø³ÀÒ¾¢Í§ÃÙ»ÀÒ¾ ¡ÒúպÍÑ´ lossy ÊÒÁÒö¼ÅÔµá¿éÁÃÙ»ÀÒ¾ÁÕ¢¹Ò´àÅç¡¡ÇèÒ¡ÒúպÍÑ´ lossless ÍÂèÒ§äáçµÒÁ àÁ×èͤس uncompress ÃÙ»ÀÒ¾ ¢éÍÁÙÅÃÙ»ÀÒ¾µé¹©ºÑººÒ§ÊèǹËÒÂä» áÅÐäÁèÊÒÁÒö¡Ùé¤×¹
• ¢¹Ò´á¿éÁ: ¢¹Ò´á¿éÁ¡ÓÅѧ ultimate ¨Ó¡Ñ´µÑÇàÁ×èͤس·Ó§Ò¹¡Ñºá¿éÁ¢Í§ÃÙ»ÀÒ¾ ¢¹Ò´¢Í§á¿éÁà»ç¹ÊÒà˵آͧ»Ñ­ËÒ·ÑèÇä»ÁÒ¡·ÕèÊØ´àÁ×èͤس·Ó§Ò¹¡ÑºÃÙ»ÀҾ㹠Microsoft Office File size is determined by the following factors: picture size, resolution, file format, compression, and color depth.
• Gamma correction: This is a method to correct the lightness or darkness of pictures, so that the pictures appear with the same brightness on any monitor.
• Hue: Hue describes the relative amounts of red, green, or blue in a color. For example, both pink and crimson have a red hue.
• Interlaced: Interlacing is a method to send picture data over the Internet. When a picture is interlaced, the following occurs: After one sixty-fourth of the picture is downloaded, you can see a general image of what the picture looks like. As more of the picture is downloaded, the resolution improves until the whole picture is displayed.
• Metafile picture: A metafile picture usually contains vector picture information. A metafile picture can contain any kind of picture data, such as a raster picture.
• Palette: A palette is a list of the colors that are available to a particular picture. Different picture file formats have a different maximum number of colors. If your picture contains more colors than are available in a specific picture format, the extra colors are replaced with colors in the color palette. The colors in the resulting image may look distorted. This is known as a "paletted effect."
• Pixel: A pixel is a fundamental unit of measurement in a raster-based picture or on a monitor. Both raster pictures and monitors are defined by rows of dots that can be individually assigned a color. These dots are called pixels.
• Raster picture: A raster picture is a picture that is displayed by defining rows of colored dots that are placed next to each other. Each dot is assigned an individual color.
• ¡ÒÃá¡éä¢: Resolution is the amount of picture data in a specific area of a picture. Resolution is usually defined in pixels per inch. The higher the resolution, the more precise and clear the picture is. However, when you increase the resolution, the file size of a picture also increases.
• Transparency: Transparency is a method that allows areas of a picture to appear transparent, therefore revealing the background. There are several methods of transparency, including alpha channel transparency.
• ¤èÒ: This property describes the lightness or darkness of a color. For example, pink and baby blue have a similar¤èÒ, although they have different hues.
• Vector picture: A vector picture is made up of areas that are defined by coordinates and mathematical formulas. This file format is more versatile than a raster picture format, because vector pictures can be scaled to any size. In some cases, vector pictures can be ungrouped into smaller components.

For more information about the graphics file types that are described in this article, visit the following third-party Web sites:Microsoft ¨ÐãËé¢éÍÁÙŵԴµèͧ͢ºÃÔÉÑ·Í×è¹ à¾×èͪèÇÂãËé¤Ø³ÊÒÁÒö¢ÍÃѺ¡ÒÃʹѺʹع·Ò§à·¤¹Ô¤ä´é ¢éÍÁÙŵԴµè͹ÕéÍÒ¨à»ÅÕè¹á»Å§â´ÂäÁèµéͧá¨é§ãËé·ÃÒºÅèǧ˹éÒ Microsoft äÁèÃѺ»ÃСѹ¤ÇÒÁ¶Ù¡µéͧ¢Í§¢éÍÁÙÅ¡ÒõԴµè͡ѺºÃÔÉÑ·Í×è¹æ àËÅèÒ¹Õé