bmsc1103 presentation

The most amazing The most amazing presentation ever made in presentation ever made in

the world maybethe world maybeHelen ‘the melon’ Ashton, Martin Helen ‘the melon’ Ashton, Martin

‘the animal’ Wong, Jack ‘the not so ‘the animal’ Wong, Jack ‘the not so animal’ Harringtonanimal’ Harrington

What is the difference between a What is the difference between a vector based image and a bitmap (or vector based image and a bitmap (or

raster) based image? raster) based image?

Bitmap graphics are stored as a series of tiny dots called Bitmap graphics are stored as a series of tiny dots called pixels. Each pixel is assigned a colour, and when they are pixels. Each pixel is assigned a colour, and when they are viewed together, they form a picture. viewed together, they form a picture.

Vector graphics are not based on pixel patterns, but instead Vector graphics are not based on pixel patterns, but instead use mathematical formulas consisting of lines and curves that use mathematical formulas consisting of lines and curves that make shapes. make shapes.

Advantages of vector image formats are that they are Advantages of vector image formats are that they are resolution independent and form smooth curves. resolution independent and form smooth curves.

Advantages of bitmap: Photos usually look more accurate. The Advantages of bitmap: Photos usually look more accurate. The gradients are smoother and it maintains the subtle details gradients are smoother and it maintains the subtle details within the photograph. within the photograph.

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What is the difference between a What is the difference between a GIF formatted file and a JPEG? GIF formatted file and a JPEG?

Why are these different and to what Why are these different and to what different purposes are they suitable different purposes are they suitable

for? for?

GIF files are very good for saving line diagrams. GIF files GIF files are very good for saving line diagrams. GIF files have the added advantage that they can save animations. They have the added advantage that they can save animations. They use a different method to compress data and so do not suffer use a different method to compress data and so do not suffer from blurring. from blurring.

A JPEG file is solid. These files are generally used as a A JPEG file is solid. These files are generally used as a background type of image. They are good for complex images background type of image. They are good for complex images like photographs; GIF files are very good for saving line like photographs; GIF files are very good for saving line diagrams. GIF files have the added advantage that they can diagrams. GIF files have the added advantage that they can save animations. Disadvantage of JPG files is that for simple save animations. Disadvantage of JPG files is that for simple figures, there is a loss of definition around boundaries; text figures, there is a loss of definition around boundaries; text and clean lines become blurred and clean lines become blurred


What is the difference between and What is the difference between and embedded graphic (image) and a embedded graphic (image) and a

linked graphic (image) in a Word or linked graphic (image) in a Word or Powerpoint document? Which is the Powerpoint document? Which is the default (the one that happens if you default (the one that happens if you

just 'paste it in') and why is this just 'paste it in') and why is this important? How did you find out? important? How did you find out?

A linked graphic is stored in the source file so that only a A linked graphic is stored in the source file so that only a representation is shown in the document. If the source file representation is shown in the document. If the source file undergoes modification, the information in the document is undergoes modification, the information in the document is also updated. also updated.

An embedded graphic becomes a part of the document and no An embedded graphic becomes a part of the document and no longer belongs to the source file so that it does not change longer belongs to the source file so that it does not change when the source file is altered. This is the default setting. This when the source file is altered. This is the default setting. This can be seen when a paint file is inserted into Word, then the can be seen when a paint file is inserted into Word, then the original paint file is changed and saved once more. The image original paint file is changed and saved once more. The image in the document does not reflect the changes made. in the document does not reflect the changes made.


What is a 'colour palette'? Give an What is a 'colour palette'? Give an example of a file with a small palette example of a file with a small palette and an example of one with a large and an example of one with a large

palette. palette.

A colour palette refers to the colours included A colour palette refers to the colours included in an image. A small palette has few colours, in an image. A small palette has few colours, whereas an image with a large palette has whereas an image with a large palette has many more coloursmany more colours

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What is lossless compression? Do What is lossless compression? Do JPEG format files normally use this? JPEG format files normally use this?

Why is it important? Why is it important?

A class of data compression algorithms that allows A class of data compression algorithms that allows the exact original data to be reconstructed from the the exact original data to be reconstructed from the compressed data. compressed data.

No, JPEG uses lossy, meaning that the decompressed No, JPEG uses lossy, meaning that the decompressed image isn't quite the same as the one you started with. image isn't quite the same as the one you started with.

Lossless compression is used when it is important Lossless compression is used when it is important that the original and the decompressed data be that the original and the decompressed data be identical. identical.


What does the FBS skills wiki say What does the FBS skills wiki say about using PNG files? (see the link about using PNG files? (see the link in the top level for these sessions). in the top level for these sessions). Are there other new file formats to Are there other new file formats to

keep an eye on? keep an eye on?

PNG or Portable Network Graphics file, overcomes PNG or Portable Network Graphics file, overcomes many of the problems with GIF and JPG files but it many of the problems with GIF and JPG files but it does not support animations. does not support animations.

GIF or Graphics Interchange Format use a different GIF or Graphics Interchange Format use a different method to compress data and so do not suffer from method to compress data and so do not suffer from blurring. However, GIF files use only 256 colours blurring. However, GIF files use only 256 colours and so a high‑resolution image saved as a GIF file and so a high‑resolution image saved as a GIF file may suffer from alterations in hue and some loss of may suffer from alterations in hue and some loss of definition.definition.

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What is BAD about using .bmp What is BAD about using .bmp format files in your work? Why format files in your work? Why

should you try to avoid this? should you try to avoid this?

The BMP file format, sometimes called bitmap or DIB file The BMP file format, sometimes called bitmap or DIB file format (for device-independent bitmap), is an image file format (for device-independent bitmap), is an image file format used to store bitmap digital images, especially on format used to store bitmap digital images, especially on Microsoft Windows and OS/2 operating systems. Bitmap Microsoft Windows and OS/2 operating systems. Bitmap images are not supported by any Web browsers or Web coding images are not supported by any Web browsers or Web coding languages. Therefore, they are not suitable for use as images in languages. Therefore, they are not suitable for use as images in a Web application. Bitmap images are best used for their a Web application. Bitmap images are best used for their intended purpose, as a system support on a PC Windows-intended purpose, as a system support on a PC Windows-based computer. They should not be used for the placement of based computer. They should not be used for the placement of a bitmap image when designing for a high-end print a bitmap image when designing for a high-end print production job. production job.


What is Flickr? Why might someone What is Flickr? Why might someone use this resource? Does it have an use this resource? Does it have an

academic use or is it purely academic use or is it purely recreational? recreational?

Flickr is a photo sharing website and web services Flickr is a photo sharing website and web services suite, and an online community platform. In addition suite, and an online community platform. In addition to being a popular Web site for users to share to being a popular Web site for users to share personal photographs, the service is widely used by personal photographs, the service is widely used by bloggers as a photo repository. Its popularity has been bloggers as a photo repository. Its popularity has been fueled by its innovative online community tools that fueled by its innovative online community tools that allow photos to be tagged and browsed by allow photos to be tagged and browsed by folksonomic means (collaborative tagging , social folksonomic means (collaborative tagging , social classification, social indexing, social tagging). classification, social indexing, social tagging).


ReferencesReferences

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Make Beautiful Truth Offer to Make Beautiful Truth Offer to WorldWorld

Thank you and goodnight Thank you and goodnight May The Force Be With YouMay The Force Be With You

bmsc1103 presentation

Business

image file format

source file

jpeg file

gif formatted file

bmp file format

dib file format

photographs gif files

bitmap images