DIGITAL IMAGING Flashcards
BITMAP
The larger the graphic, the more pixels
are needed and so the file size
becomes larger
BITMAP
If small graphics are enlarged, the
graphics can become blurred (PROBLEM)
BITMAP
Easily convertible into other formats, picture is restricted to a rectangle, minimal support for transparency
VECTOR
A graphic expressed mathematically aka using numbers
VECTOR
Instructions for drawing the shape are stored
Graphics that use polygons/geometric shapes
VECTOR
Graphics can be scaled up to whatever size without quality being ruined (loss of quality)
Graphics that use points, shapes, curves, lines, are stored as mathematical equations
VECTOR
Graphics can be scaled up to whatever size without quality being ruined (loss of quality)
Graphics that use points, shapes, curves, lines, are stored as mathematical equations
VECTOR
You can increase and decrease the format size and your lines and specific shapes will remain crisp and sharp
VECTOR
You can zoom in or out as much as you like without the picture being blurred/without changing quality of the image being changed
ADVANTAGES OF USING VECTOR OVER BITMAP
- Vector graphics can be enlarged without loss of quality
- Can edit individual parts of a grouped object
- Smaller file sizes
- Faster to download/upload
OPSTIMISING AN IMAGE IS..
Reduction of size, file size, number of colours, resolution, dimensions, and quality over all
For;
Faster uploads/downloads
Saves memory
ADVANTAGES OF A JPEG
1) 24-bit (RGB/any) colour, with up to 16 million colours / ideal for images that
use more than 256 colours
2) Smaller files
ADVANTAGES OF JPEG
3) Compatible with most if not all operating systems
4) Most used and widely accepted format for images
5) Has rich colours, really great for fine photographers who need detailed pictures
DISADVANTAGES OF JPEG
1) Less compression aka reduce the size, discard of data and quality
2) After compression JPEG tends to create artefacts (man edited)
DISADVANTAGES OF JPEG
4) Does not support transparency
5) Cannot be animated
ADVANTAGES OF GIF
1) Can support transparency
2) Can do small animation effects
3) Great for images that have limited or block colours
ADVANTAGES OF GIF
1) Can support transparency
2) Can do small animation effects
3)
ADVANTAGES OF A GIF
Very commonly used too, can be compressed by removing and unnecessary data,
DISADVANTAGES OF A GIF
Only supports 256 colours, animated GIFS cannot be edited afterwards with tools, etc, file size can be larger than PNG
ADVANTAGES OF A BMP
Bitmap files may be easily created from existing pixel data stored
in an array in memory
Supported by most OS
Most suitable for icons and small images
Pixel colours can be modified individually or as large groups
DISADVANTAGES OF A BMP
Large file sizes – not web friendly / mac friendly
ADVANTAGES OF A TIFF
Very flexible format, compression - JPEG, LZW, ZIP / no compression at all,
TIFF format be saved with layers, saved with transparent background
DISADVANTAGES OF A TIFF
Very large file size, slow to download and slow loading time
ADVANTAGES OF A PNGD
Lossless, doesn’t lose quality/detail after compression
Better than GIF because it makes smaller files
Supports transparency more than a GIF
DISADVANTAGES OF A PNG
Not all web browsers accept PNG files, format isn’t good for large pictures because they tend to generate bigger files
Sometimes creates bigger files than JPEG
Cannot be animated
