Export GeoTIFF speed is too slow if custom projection is set

MaxMax Global Mapper UserPosts: 14
edited February 2010 in SDK
Hi everyone!

I am use GM v.10 SDK in my project for export multiple png tiles from large geotiff file. Export of each individual tile takes 1-3 seconds with default projection, but if I change global projection to mercator, export is slow down extremely (up to 40 seconds per tile). However, that's true not for all geotiffs I used for tests. After a small investigation, I found that some files was made using JPEG compression, so I converted them to geotiffs without any compression applied to pixel data and tried export again. As I expected, export speed became fast - 1-5 seconds per tile (with mercator projection set). Unfortunately, source files conversion isn't an acceptable solution for my project. Please, advise how to resolve this issue or any reasonable workaround

Best regards,
Maxim

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