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Br J Ophthalmol 85:799-802 doi:10.1136/bjo.85.7.799
  • Scientific correspondence

Effect of digital image compression on screening for diabetic retinopathy

Table 2

Frequency and extent of misgrading of 49 digital images of diabetic retinopathy with JPEG compression

Degree of error (grades) Degree of JPEG compression
90% 80% 70% 0%
+1 3 2
 0 29 33 35 39
−1 15 15 9 7
−2 2 2 1
−3 3 1

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