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Image and Graphic Files Image and Graphic Files Chris Bath Chris Bath Sally Joseph Sally Joseph Mike Tempest Mike Tempest Jackie Webster Jackie Webster

Image And Graphic Files

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Page 1: Image And  Graphic  Files

Image and Graphic FilesImage and Graphic Files

Chris BathChris Bath Sally JosephSally Joseph Mike TempestMike Tempest Jackie WebsterJackie Webster

Page 2: Image And  Graphic  Files

Vector or Bitmap?Vector or Bitmap?

VectorVector – These are used for illustration with – These are used for illustration with precise measurements, as such can be scaled precise measurements, as such can be scaled accurately. Due to this however, it is not accurate accurately. Due to this however, it is not accurate for photos.for photos.

Bitmap – Bitmap – These, in contrast, are more suitable for These, in contrast, are more suitable for photographic images. They are less easily photographic images. They are less easily manipulated, as the edges would be appear manipulated, as the edges would be appear jagged.jagged.

Page 3: Image And  Graphic  Files

JPEG vs GIFJPEG vs GIF

JPEG are suitable for web design featuring JPEG are suitable for web design featuring photographs as it supports 16million colours.photographs as it supports 16million colours.

GIF files support 256 colours, as such are useful for GIF files support 256 colours, as such are useful for pictures. They can also support transparency, so the pictures. They can also support transparency, so the image appears borderless.image appears borderless.

JPEG GIF

Page 4: Image And  Graphic  Files

Colour PaletteColour Palette

The basic set of colours is called a system The basic set of colours is called a system palette.palette.

Colors : Colors : aqua, black, blue, gray, fuchsia, green, lime, aqua, black, blue, gray, fuchsia, green, lime, maroon, navy, olive, purple, red, silver, teal, white, maroon, navy, olive, purple, red, silver, teal, white, yellow. yellow. These colors were picked as being the standard These colors were picked as being the standard 16 colors supported with the Windows VGA palette.16 colors supported with the Windows VGA palette.

Page 5: Image And  Graphic  Files

Lossless CompressionLossless Compression

Refers to data compression techniques in which no Refers to data compression techniques in which no data is lost. Space required for the file can be data is lost. Space required for the file can be reduced by this technique.reduced by this technique.

Only certain files can use this technique: e.g. Only certain files can use this technique: e.g. graphics, audio, and video graphics, audio, and video

This technique is useful, as the information being This technique is useful, as the information being discarded is often unnoticeable to the human eye. discarded is often unnoticeable to the human eye. JPG files use this.JPG files use this.

Page 6: Image And  Graphic  Files

BMP. Files are BAD!BMP. Files are BAD!

The BMP. Files are lossless. These are The BMP. Files are lossless. These are unable to store animation, and cannot be unable to store animation, and cannot be used on the web.used on the web.

These files cannot be viewed, and These files cannot be viewed, and therefore is unsuitable for work.therefore is unsuitable for work.