[HDR-photo] Why does the preview look better than the final output image?

[keith.henson21 at ntlworld.com]

Hi guys,

I've been putting 2.4 through some serious work over the last few days and when it's doing the job it's great, but it seems a bit 'buggy' and crashes on a regular basis.

Has anybody else noticed this?

Keith
www.northscape.co.uk
> 
> From: "Geraldine Joffre" <hdr-photo at hdrsoft.com>
> Date: 2007/03/27 Tue AM 09:36:13 GMT
> To: High Dynamic Range Photography <hdr-photo at hdr-photography.com>
> Subject: Re: [HDR-photo] Why does the preview look better than the final
> 	output image?
> 
> On Mon, 26 Mar 2007 17:02:24 -0700, Bob Wise wrote
> > Perhaps a silly question... can the software not provide the preview 
> >  algorithm as an option for image processing?
> The preview algorithm is already used for the final result. The difference is
> not in the algorithm but in the size of the image to which the algorithm is
> applied. If you resize your HDR image to the size of the preview, then the
> final output will be exactly the same as with the preview. 
> 
> Actually, in case you get a large difference with the preview, with the final
> result being very dark, resizing the image only slightly may be sufficient. In
> this case, the dark final result is because the HDR image includes too many
> abnormally low values which confuse the Details Enhancer algorithm. But if you
> resize the HDR image, the interpolation done for resizing should smooth out
> the outliers low values, and the algorithm should then work normally.
> 
> Geraldine Joffre
> 
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