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

[Bob Wise]

I haven't had a crash. I'm running WinXP SP2 on a dual-core conroe w/ 
2gb main memory. You?
Not using Vista are you? :-)

-Bob

On Mar 27, 2007, at 8:04 AM, <keith.henson21 at ntlworld.com>  
<keith.henson21 at ntlworld.com> wrote:

> 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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>>
>
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