topic 16 Digital imaging

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what are two types of graphic?
Bitmap and vector
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what is bitmap?
Bitmap images are made up of millions of pixels, normally very small. This means you cannot actually see them in the image until it is zoomed in. Remember the more pixels the larger the file size.
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what are the impacts of a large storage file?
Large file size means large upload time (i.e., time to transfer file to a website is large). Large file size means download time is large (i.e., the time taken for a user to view the image on a website). Files are compressed to reduce file size.
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other problems of bitmap graphics?
Harder to edit than a vector. Image loses sharpness when re-sized.
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what are vectors?
are graphics that use maths to work out the positions and lengths of lines, curves etc
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what are the impacts of small file size for vector graphics
Quick upload time. Quick download time. Can store lots more images in the same storage space compared to bitmaps.
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Advantages of vector graphics compared to bitmap graphics
Small upload/download time. Easier to edit as you can edit parts of the image. Can re-size image without loss in quality.
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Disadvantages of vector graphics
Only suitable for images with a limited number of colours. No good for images with continuous colours like a photograph.
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Manipulating graphics using standard tools
Graphics can be manipulated in a number of ways including: Zoom Selection Transforming Rotate Reflect Sizing Scaling Copying
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Colour effects
There are many colour effects that can be applied to a graphic. Here are some of the main tools: Colour Palette Gradient tools
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What are Common File Formats
GIF files – graphical interchange format. Original image is compressed. They have the advantage that they are small in file size. A max of 256 colours can be used, this means don’t quite look like the original image. They are good for images.
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another common file format
JPEG – joint photographic expert group. Ideal for photos. Original image is compressed. Uses 16 million colours.
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4 other common file formats
PNG – portable network graphics TIFF – tagged image file format PSD – Photoshop document BMP – Bitmap
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Optimising images for the Web
Optimisation is the reduction of the file size of the image.
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Other cards in this set

Card 2

Front

Bitmap images are made up of millions of pixels, normally very small. This means you cannot actually see them in the image until it is zoomed in. Remember the more pixels the larger the file size.

Back

what is bitmap?

Card 3

Front

Large file size means large upload time (i.e., time to transfer file to a website is large). Large file size means download time is large (i.e., the time taken for a user to view the image on a website). Files are compressed to reduce file size.

Back

Preview of the back of card 3

Card 4

Front

Harder to edit than a vector. Image loses sharpness when re-sized.

Back

Preview of the back of card 4

Card 5

Front

are graphics that use maths to work out the positions and lengths of lines, curves etc

Back

Preview of the back of card 5
View more cards

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