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Table 1 File size of the example scene blob.pov, rendered in different resolutions and stored in the file formats PPM and PNG, as well as the compression ratio

From: Parallel image computation in clusters with task-distributor

Resolution PPM file size (Bytes) PNG file size (Bytes) Compression ratio
200 × 150 90,142 8974 ≈10
400 × 300 360,142 24,994 ≈14
800 × 600 1,440,142 67,159 ≈21
1600 × 1200 5,760,144 184,827 ≈31
3200 × 2400 23,040,144 519,951 ≈44
6400 × 4800 92,160,144 1,451,245 ≈63
  1. The compression ratio is the ratio between the uncompressed size (PPM) and compressed size (PNG)