Colour value
A mathematically calculated value of a pixel's colour based on its colour components.
As each pixel is being created it is assigned a colour value, called a tonal value, of black, white, shades of grey, or an actual colour.
Automatically senses 'dead pixels' and maps them out by averaging colour values from surrounding pixels.
Exposure shift
- ESP
- Center weighted
- Spot ...
Digital Bitmap images (raster images) use a grid of colours known as pixels to represent images. Each pixel is assigned a specific location and colour value.The whole image would contain millions of individual pixels.
These standards are internationally accepted standards for all colourmetric measurements. The Lab model, like other CIE colour models, defines colour values mathematically, in a device independent manner.
The advantage is that you have the ability to alter the white balance, exposure value, colour values, contrast, brightness and sharpness as you see fit before you convert this data into the standard JPEG or TIFF format.
An organisation that created a universal colour mode that describes colour in a 3D axis which they called Lab mode. This mode allows all visible colour to be specified and has a luminance (L) channel and an A and B channel that represent colour ...
 See also: Image, Value, Camera, Digital, Photograph
  
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