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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