Category Archives: tech

Wavelet Fixes

*Small bug fixed (decidedly non-power-of-2 images sometimes had important wavelet-coefficients zeroed out). Thanks, Christian Lange!*
Wavelet code updated to version 2.5.2 (including source). Improved the quantiser-selection for bit-limits (i.e. file-size) a LOT (was a bit stupid before – I only optimised for the smallest difference in maximum and minimum mean square error) -> much better results for same size, changed compile-settings slightly (should be faster) and added a bitplane / quantiser display to the GUI. Get it here!

Nvidia pays Strippers

Had a great time at Nvidia’s Dawn to Dusk conference (I really hope they don’t get around to putting up some of the more embarassing photographs…). Although some of the talks were slightly modified versions of presentations given earlier, most of them were still very interesting (Kevin Bjorke’s talk on cinematic effects and the one on technology used in their demos by Tristan Lorach to mention a few)…

Performance Monitor (PDH) again

When you’ve added a counter to a query whose instance does not exist yet, then you get an PDH_STATUS_NO_INSTANCE error (or something like it). But you still get that same error after the instance has been created; even if you remove the counter from the query and add it again. The only remedy seems to be to call PdhEnumObjects with the bRefresh flag set to TRUE, and the re-adding the counter, but that is very slow…