ADEFGHIJKLMNOPQRSTUVWXYZAA
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contourspolygonsmixed line types and symbols
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https://www2.greenwoodmap.com/cgi-bin/mapserv64?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=gif&TRANSPARENT=true&MAP=MAP02&LAYERS=contour&CRS=EPSG%3A3736&STYLES=&WIDTH=2048&HEIGHT=951&BBOX=758835.607038844%2C251842.50111119202%2C763206.8623282508%2C253872.31741013043https://www2.greenwoodmap.com/cgi-bin/mapserv76?FORMAT=png8&TRANSPARENT=on&MAP=MAP04A&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&LAYERS=taxclass&CRS=EPSG%3A3738&STYLES=&WIDTH=1341&HEIGHT=873&BBOX=1570932.717903454%2C157933.79142754848%2C2325647.821520054%2C649258.3890839927
https://www2.greenwoodmap.com/cgi-bin/mapserv76?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=png8&TRANSPARENT=true&MAP=MAP05&LAYERS=townlim%2Cownership%2Croads&CRS=EPSG%3A3857&STYLES=&WIDTH=2048&HEIGHT=951&BBOX=-11779505.560954299%2C5039929.278624678%2C-11727325.202841822%2C5064159.513275541
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driverimagesizereq/secimagesizereq/secimagesizereq/sec
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[1] GD/GIF
https://www.greenwoodmap.com/mapserver/outputformat/contours-gd-gif.gif
200kB6.2
https://www.greenwoodmap.com/mapserver/outputformat/polys-gd-gif.gif
65.8kB22.7
https://www.greenwoodmap.com/mapserver/outputformat/mixed-gd-gif.gif
141kB3.8
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[2] AGG/PNG8
https://www.greenwoodmap.com/mapserver/outputformat/contours-agg-png8.png
961kB4.2
https://www.greenwoodmap.com/mapserver/outputformat/polys-agg-png8.png
126kB10.5
https://www.greenwoodmap.com/mapserver/outputformat/mixed-agg-png8.png
310kB3.9
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[3] AGG/PNG8, Gamma 0.01n/a
https://www.greenwoodmap.com/mapserver/outputformat/polys-agg-png8-gamma-0.01.png
34.7kb12.7n/a
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[4] AGG/PNG8, AA off
https://www.greenwoodmap.com/mapserver/outputformat/contours-agg-png8a.png
202kB5.1
https://www.greenwoodmap.com/mapserver/outputformat/polys-agg-png8a.png
23.1kB12.4
https://www.greenwoodmap.com/mapserver/outputformat/mixed-agg-png8a.png
90.0kB4.8
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 CAIRO/PNG8
https://www.greenwoodmap.com/mapserver/outputformat/contours-cairo-png8.png
985kB
https://www.greenwoodmap.com/mapserver/outputformat/polys-cairo-png8.png
142kB12.5
https://www.greenwoodmap.com/mapserver/outputformat/mixed-cairo-png.png
306kB5.1
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[5] CAIROPNG, AA off
https://www.greenwoodmap.com/mapserver/outputformat/contours-cairo-png8a.png
175kB4.4
https://www.greenwoodmap.com/mapserver/outputformat/polys-agg-png8a.png
20.6kB18.8
https://www.greenwoodmap.com/mapserver/outputformat/mixed-cairo-pnga.png
98.5kB9.6?
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Driver Notes
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1 MapServer 6.4 default GD/GIF driver
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2 MapServer 7.6 default AGG/PNG8 driver
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3 MapServer 7.6 default AGG/PNG8 driver, FORMATOPTION "GAMMA=0.01"
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4 MapServer 7.6 built w/ AGG anti-aliasing disabled (credit to Andreas Eichner)
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5 MapServer 7.6 built w/ option to turn off anti-aliasing in Cairo driver (credit to Andreas Eichner)
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GAMMA a has significant effect, but only on filled polygons and only with AGG/PNG
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FORMATOPTION "COMPRESSION=9" didn't have a huge affect (default = 6)
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GIF line widths are integers, PNG can be fractional which could improve the looks of aliased AGG/PNG8
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