Grainy HDR results

[Pupp]

Just been playing with the basic Photomatix app and all my resluts seem pretty grainy/noisy... clearly I'm not driving things right or the originals are not correctly specced... tips for optimum output quality (I know the colours might get a bit wacky)?

[stigmundfreud]

take more exposures at closer ev values

[RobDickinson]

Yeah its touchy about the number of exposures, I tried from one and it was hideous.

3 isnt enough, I usualy try 7-9 shots.

[AlfaFoxtrot]

Use RAW if you can and export to TIFF for Photomatix, the more the merrier but 5 shots at 1EV spacing ought to be enough for most things. Keeping the ISO to a minimum would help too.