PanoTools NG:
Re: Re: New hardware testing on PTgui performance
Joost Nieuwenhuijse 2008-Jan-03 13:27:34
Hi Helmut, Bernhard and others,
>> As has been mentioned in this thread, IO related bottlenecks
>> are due to the use of uncompressed fileformats, if not for
>> the final then for intermediate tempfiles. A request to
>> the authors of frontends to my pano-libraries (ptgui, nona,...):
>> please insert the line
>>
>> TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_PACKBITS );
Actually PTGui doesn't use tiff files for temporary storage..
Compression could be incorporated somehow, but it's not that simple.
> Just as a number: I have compared 2 methods with PTGui:
> - one is rendering a large panorama as one large image: took 2h 38min,
> warping (and temp file writing) took only 30min, the rest was blending time
> - the other is rendering this large panorama in 100 parts (slices): took
> 1h 25min
> It can easily be seen that computational cost of the blender raises
> exponentially if you overstrain current blending algorithms with large
> images.
That's interesting indeed. I have several ideas to improve performance
and reduce disk usage for gigapixel panos but haven't yet found the time
to do this.
Joost
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