Matthew Wong
So what is Digital Imaging? Images are objects that can communicate a  meaning or information. Now, if an image is  trans...
Raster Images Raster Images are made of  individual pixels on the screen Can also be referred to as Bitmap  images Depe...
Raster Images Advantages:- Ideal for natural and photographic images with high level    of detail-   Maintains image qual...
Vector Images Created on the computer using  mathematical calculations to  make a line or a curve. Are NOT resolution de...
Vector Images Advantages:- Much more flexible than raster images- NOT resolution dependant – quality does not change when...
Image file formats Image file formats are images that have been stored    using a specific file format. This allows the c...
Image file formats - JPEG JPEG – Joint Photographic Expert Group- Developed specifically to provide a suitable format for...
Image file formats - GIF   GIF – Graphic Interchange Format   Developed specifically for online use   Ideal use for web...
Image file formats - TIFF Tagged Image File Format Leading professional image standard. Used to archive important image...
Image file formats - PNG PNG – Portable Network Graphic For displaying colour images on the web Advantages:- Supports t...
Image file formats - BMP   BMP – Bitmap   Used as a simple graphics format for platforms   Advantages:-   Free of paten...
References Images: http://www.webcoursesbangkok.com/wp-content/uploads/2010/10/image-raster-  leaves.jpg - visited 16/3/...
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Ait digital imaging

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Ait digital imaging

  1. 1. Matthew Wong
  2. 2. So what is Digital Imaging? Images are objects that can communicate a meaning or information. Now, if an image is transferred into a computer or a digital device, it must be in a digital form. Digital Image – an image that can communicate meaning or information digitally. There are two types of Digital images these of which are Vector Images and Raster Images.
  3. 3. Raster Images Raster Images are made of individual pixels on the screen Can also be referred to as Bitmap images Dependant on resolution - very difficult to resize without altering the quality of the image IDEAL for natural and photographic images that have a high level of detail with complex colours and tones.
  4. 4. Raster Images Advantages:- Ideal for natural and photographic images with high level of detail- Maintains image quality with a reduced file size- Easy to edit which is a plus for users that digitally manipulate images- Easy to alter the colour of the image Disadvantages:- Resolution dependant, which means that pixels are visible as the quality is reduced- File size is determined how the image is altered
  5. 5. Vector Images Created on the computer using mathematical calculations to make a line or a curve. Are NOT resolution dependant – resizing the image will not affect the quality of the it. IDEAL for simple geometric shapes and logos and typefaces
  6. 6. Vector Images Advantages:- Much more flexible than raster images- NOT resolution dependant – quality does not change when image is resized- File size is smaller than Raster images since they produce less information Disadvantages:- In order to be viewed on a monitor, they must be converted to become a raster image.- Since computer monitors can only show pixels- The computer has to recalculate the vector images every time it is refreshed.
  7. 7. Image file formats Image file formats are images that have been stored using a specific file format. This allows the computer to tell what type/kind of data is stored within the image file. IMAGE FILE FORMATS- .jpg- .tif - TIFF- .bmp - bitmap- .gif- .png
  8. 8. Image file formats - JPEG JPEG – Joint Photographic Expert Group- Developed specifically to provide a suitable format for the storage of photographic and photo-realistic images- For photographic and image files Advantages:- Gives very high compression ratios- Used for highly detailed, natural, art or photographic images- Acceptable in most websites- Great for transmitting across different Media Disadvantages: Compression is cumulative – this means that everytime it is compressed over and over again, the quality is lost as data keeps on being removed Mainly designed for websites and emails.
  9. 9. Image file formats - GIF GIF – Graphic Interchange Format Developed specifically for online use Ideal use for webpages since it GIF’s are cross platform and compressed Advantages:- Best for images with a large area of solid colours. E.g shapes, logos and text- Designed to produce small files. Hence, the best file format for transmit over the net- Can be interlaced and animated- Can be set to be transparent Disadvantages:- Has a limited colour depth of 8 bits (only 256 colours)- Not suitable for natural or photographic images.
  10. 10. Image file formats - TIFF Tagged Image File Format Leading professional image standard. Used to archive important images because of its high quality and flexibility for an image Advantages:- Lossless – image resolution does not change after being modified- Quality of the image is very high- Good for photo-realistic images Disadvantages:- File size is very large- Not a suitable format for the web
  11. 11. Image file formats - PNG PNG – Portable Network Graphic For displaying colour images on the web Advantages:- Supports transparency- Has a colour depth of 32 bits- Improved image compression- Lossless compression scheme Disadvantages: Has not been widely accepted and supported by viewing browsers and the public Lossless compression scheme will make it have a larger file size
  12. 12. Image file formats - BMP BMP – Bitmap Used as a simple graphics format for platforms Advantages:- Free of patents- Pixel values can be modified individually or as large groups. Disadvantages:- Can’t be used to transfer files over the net- Very large file size- Can’t be compressed (typically)
  13. 13. References Images: http://www.webcoursesbangkok.com/wp-content/uploads/2010/10/image-raster- leaves.jpg - visited 16/3/12 http://www.smashingapps.com/wp-content/uploads/2008/01/logo-templater-snap.jpg - visited 16/3/12 http://vector-conversions.com/images/raster_vs_vector_1.jpg - visited 16/3/12 http://garcya.us/wp-content/uploads/2007/07/16-Free-Real-Estate-Vector-Logo- types.jpg - visited 16/3/12 Information:- Groups.esa.edu.au – Applied information technology course outline 2A- Documents used:- Raster v Vector- Image file formats- Digital Image basics- http://userwww.sfsu.edu/~pbwong/groupproject/ad_dis.html - visited 16/3/12- http://www.fileformat.info/mirror/egff/ch03_08.htm - visited 16/3/12
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