ait digital imaging
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AIT Portfolio Task 5Image presentations
Matthew Wong
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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.
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Raster ImagesRaster Images are made of
individual pixels on the screenCan also be referred to as
Bitmap imagesDependant 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.
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Raster ImagesAdvantages:- 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 imageDisadvantages:- Resolution dependant, which means that pixels are
visible as the quality is reduced- File size is determined how the image is altered
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Vector ImagesCreated 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
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Vector ImagesAdvantages:- 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 informationDisadvantages:- 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.
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Image file formatsImage 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
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Image file formats - JPEGJPEG – 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.
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Image file formats - GIFGIF – Graphic Interchange FormatDeveloped specifically for online use Ideal use for webpages since it GIF’s are cross platform and
compressedAdvantages:- 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 transparentDisadvantages:- Has a limited colour depth of 8 bits (only 256 colours)- Not suitable for natural or photographic images.
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Image file formats - TIFFTagged Image File FormatLeading professional image standard.Used to archive important images because of its high
quality and flexibility for an imageAdvantages:- 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
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Image file formats - PNGPNG – Portable Network GraphicFor displaying colour images on the webAdvantages:- Supports transparency - Has a colour depth of 32 bits- Improved image compression- Lossless compression schemeDisadvantages:Has not been widely accepted and supported by
viewing browsers and the publicLossless compression scheme will make it have a larger
file size
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Image file formats - BMPBMP – BitmapUsed as a simple graphics format for platformsAdvantages:- 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)
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References Images: http://www.webcoursesbangkok.com/wp-content/uploads/2010/10/image-raste
r-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