Influence of luminance on colour bleeding artefacts in colour image compression

This paper investigates the influence of luminance on colour bleeding artefacts. Colour bleeding artefacts are the distortions due to sub sampling and quantisation of colour images during compression. Performance of the IrfanView™ JPEG and JEG2000 codecs were evaluated for colour reproduction under varying luminance levels. Authors argue that the luminance signal, Y influence the hue of a colour image. Six colour test patterns having same hue and step luminance values were designed and used to compress and reconstruct with the Irfanview™ codecs. The luminance affects the hue of the reconstructed image differently for different hue values. The relationship cannot be generalised that increasing luminance values result in increasing hue errors. At some luminance values, hue did not show any errors. However, in general, with increasing compression ratio the colour bleeding due to the cross luminance effect increases. Based on the proposed methodology, the Irfanview™ JPEG2000 codec outperformed the JPEG codec for colour reproduction.