iMedia R081 Pre Production Skills

3.2: describe the properties and limitations of file formats for still images

Producing Pre Production documents
Test your self on these keywords and definitions using the games below or Play random game
bitmapAn image made up of individual pixels
colour paletteThe number of colours used in the image
compressionTechnique used to reduce the file size of an image
DPIA measure of quality calculated by the number of dots or pixels in a line that's 1 inch long.
file formatThe type of file that has been saved
file sizeThe number of bytes used to store the image.
GIFFile format that uses lossy compression to reduce file size. Great for logos or cartoons with a limited number of colours but not suitable for photos. Supports animation and transparency.
heightThe number of pixels in each column up/down an image
JPGFile format that uses lossy compression to reduce file size. Great for photos or use on the internet but doesn't support transparency and reduces the number of colours and detail available.
limitationsWeaknesses of a particular file format
PDFFile format that combines images and text in a way that can be easily distributed without needing particular fonts or software to be installed.
PNGFile format that uses lossless compression or no compression for high quality images. Large file size but supports full or partial transparency. Suitable for diagrams or logos but not ideal for photos due to large file size.
PSDFile format used by Photoshop that stores layers and effects separately so images can be easily edited providing that you have Photoshop installed. Very large file size.
still imageA picture rather than a video or animation
transparencyWhether or not parts of an image can be completely or partially see through
vectorAn image made up of shapes, colours and patterns
widthThe number of pixels in each row across an image
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