Figure 3

Figure 3

Metacarpal phalangeal joint; index finger of hand shown in Figure 1. Progressive compression using JPEG with DCT algorithm. Images are unscaled and unenhanced. Trabecular detail is well-maintained even at compression ratios of 19:1. Subtle image degradation is present at 40:1. The image is unreadable at 85:1 with prominent block artefact.

	

	
	
Original image, losslessly compressed.
	
	
QF = 100.0, compression ratio =  2.4:1.
	
	
QF =   7.0, compression ratio =   10:1.
	
	
QF =   3.2, compression ratio =   19:1.
	
	
QF =   1.0, compression ratio =   40:1.
	
	
QF =   0.1, compression ratio =   85:1.
	
	

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