Working with Web Graphics About Web Graphics . File Formats . Image Resolution, Image Size
Graphics And Image Files[1]
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Transcript of Graphics And Image Files[1]
Graphics and Image Files Vlad Botchkarev Saadat Ahmed Emma Boothman Dave Hughes
Vectors and Bitmap (Raster) Images
Vector images Are defined mathematically by the computer Can be modified Easily scalable Less memory required
Bitmap images Rectangular grid of pixels with each pixel holding
a specific colour value Suitable for photos
GIF and JPEG Images GIF Suited for simple images such as
graphics or logos
JPEG Suited for photos and images with
smooth variation of tone and colour Relatively small file size Quality decreases when repeatedly
edited and saved
Embedded and Linked Graphics Embedded files
Permanently linked to document
Independent of original source Stored as part of the file and
not externally
Linked files Dependent on original source Change if source document
changes (e.g. Microsoft Excel spreadsheet)
Not stored as part of document; need to be present with document
Default action after copy-paste is embedded. Source: Microsoft Office Online Help
http://previews0.coolclips.com/01/tf05038/NVTech_busi0407.jpg
What is a Colour Palette? Collection of colours used by the
image Different colour ranges for different
uses
Personal photography, advanced editing High-resolution, 24 bit (16 million
colours) Uses large palette
Web-based imaging Lower-resolution, 8 bit (156
colours) Small palette
Not all computer monitors designed with advanced colour range
Faster loading speeds via slow connections
http://www1.istockphoto.com/file_thumbview_approve/720581/2/istockphoto_720581_painter_s_palette.jpg
Source: PaintshopPro Help
What is Lossless Compression? Do JPEG files normally use this?
Lossless compression is the compression of a file without a loss of quality
Jpeg files do not use lossless compression
The image is an exact copy whilst taking up less disk space
Taken from: http://en.wikipedia.org/wiki/Lossless_compression
What the FBS skills wiki says about png files
Png – portable network graphics It is a bitmapped image format that
employs lossless compression It was created to improve on gif
format, and overcomes many problems that are associated with gif and jpg files
It does not, however, support animationsTaken from: FBS skills wiki
Why .bmp format images are bad and why should you avoid using them?
.bmp images cannot be compressed, therefore will have a large file size.
They are not capable of storing animation.
They are not supported by web browsers.
Taken from:http://support.microsoft.com/kb/320314
and http://www.fortunecity.com/skyscraper/windows/364/bmpffrmt.html
What is Flickr?
It is a worldwide photo sharing website.
Used for communal purposes and used by bloggers.
Can also be used in group work to allow easy access for all members of a group to access the same material to use it in one shared document. Taken from: http://en.wikipedia.org/wiki/Flickr