[gdal-dev] nearblack on multi GB images very slow

[Matt.Wilkie at yukon.ca]

>You need to count tiles in the row, not pixels.

>
>ceil(126015/128)*3*8*128*128 = 387 118 080 = half a gigabyte.

Thank you! That made a huge difference. With GDAL_CACHEMAX=1024 it finished in about 40 minutes.

-Matt
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