Image Optimisation – Comparison Table

Product File Size  No. Files  Uncompressed  Optimised    Optimised+Overviews  Total Storage
OS VML Col 0.3-10MB  562  184MB      2-30MB  3.12GB
OS VML BW 1-3.5MB  562  184MB 0.3-5MB    0.3-5MB  1.05GB
OS VMD Col 0.2 – 2.2MB 80 67.2MB 0.8 – 2.2MB   1-4.5MB  231MB

There are number of things to look at in terms of optimising images for web mapping:

  1. File size and total storage required
  2. Draw performance
  3. Image quality Continue reading Image Optimisation – Comparison Table