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Table 1 The number of colours within the original and expanded colour tables with different threshold . Note that "Distortion due to expansion" is the distortion incurred after one virtual colour is assigned to one pixel in the original image.

From: Progressive Exponential Clustering-Based Steganography

Image Number of coloursbefore expansion Number of coloursafter expansion Expansion rate Distortiondue to expansion
  
Hill 149509 163513 163993 64.21 dB 66.20 dB
Mandrill 662895 663023 663023 62.05 dB 66.20 dB