Dig Lit II - Vocabulary

  • compress: to decrease the number of bits used to represent a piece of information
    • lossless compression - data (number of bits) is compressed in a way that the preserves all data and allows full recovery - gif, wav and png files use this method
    • lossy compression - some data (bits) gets thrown away meaning you cannot recreate the original file later - this is used in jpg and mp3 files
  • gif - Graphics Interchange Format - an image file with limited color (256) - best for images such as clipart - can be used for animations
  • jpeg or jpg: Joint Photographic Experts Group - an image file with high quality color and resolution - often used for photographs
  • heic/heif - high efficiency file format - a newer image format that is starting to be used on cell phones (*not all photo editing software recongizes this though so you might need to convert the files or change your phone settings to use .jpg as a default)
  • hue - everyday photographers generally think of hue as referring simply to a specific colour
  • leading lines - natural lines in an image the draw the viewer's eye to a particular part of the image
  • lightness - (or ‘value’ or ‘tone’) relates to the amplitude of the colour – or its proximity to the white or black end of the tonal scale. A colour with low value is close to black, while one with high value is close to white
  • point of view - the position the camera is in when taking a picture -subjects can be dramtically distorted from different viewpoints
  • png - Portable Network Graphic - intended as a replacement for the GIF file type - does not support animations but is lossless
  • resolution - the amount of detail held in an image - measured in pixels
  • rgb color model - a mixture of pure red, green, and blue lights of various strengths. Each of the red, green and blue light levels is encoded as a number in the range 0..255, with 0 meaning zero light and 255 meaning maximum light.
  • rule of thirds - breaking your picture into thirds (vertical & horizontal) and placing an object of interest at one of the grid intersections
  • saturation - or ‘chroma’ - defines the intensity of a hue