P.S. We should move this discussion to the HDRI mailing list, since it is not a problem with evalglare or any Radiance tools.
> From: Greg Ward <[email protected]> > Date: February 6, 2018 9:45:19 AM PST > > Ha. Jan is right -- the HDR values are way off. I should have looked at the > result more closely and noticed that everything was too bright. > > I can take your JPEGs and give them to Photosphere or hdrgen, combining them > using a generic response function. I cannot solve for the camera response > with these inputs, which likely means that the camera is playing around with > the tone curve on the different exposures. This is a no-no, and indicates > that the camera is probably not suitable for HDR capture. Nevertheless, > hdrgen can create something usable that does not agree at all with your > result. > > By the way, your shortest exposure is still clipping the sun, which means > that your DGP won't be accurate for this scene, even if you can get your HDR > builder to work unless you can get a shorter exposure. > > Cheers, > -Greg > >> From: Jan Wienold <[email protected]> >> Date: February 6, 2018 9:24:54 AM PST >> was it taken on mercury ? ;-) >> the luminances are far off... it sums up to more than 600000 lux >> Jan >> >> >> On 06.02.18 18:18, Greg Ward wrote: >>> Hi Raghu, >>> >>> We may need to wait to hear from Jan or someone who understands evalglare >>> better than I do. I don't think there is a problem with your HDR image as >>> you generated it. >>> >>> -Greg >>> >>>> From: raghuram kalyanam <[email protected]> >>>> Date: February 6, 2018 9:05:41 AM PST >>>> >>>> Hi Greg, >>>> >>>> I added these options while passing to evalglare like below. >>>> >>>> evalglare -vta -vh 180 -vv 180 <hdr file>, and it worked but it always >>>> gives 1.0 as DGP (even other parameters are out of bounds). >>>> >>>> With out those options evalglare throws an error. >>>> >>>> Apart from that >>>> >>>> Are all the LDR’s provided, valid to combine into HDR? >>>> >>>> I doubt if one or more of the LDR’s is the culprit (especially something >>>> to do with over or under exposure). >>>> >>>> Best Regards, >>>> Raghu >>>> >>>>> On Feb 6, 2018, at 5:05 PM, Greg Ward <[email protected]> wrote: >>>>> >>>>> Hi Raghu, >>>>> >>>>> It looks like your HDR image header is missing the necessary view >>>>> information. Typically, this might be something like: >>>>> >>>>> VIEW= -vta -vh 180 -vv 180 >>>>> >>>>> for a perspective such as yours. You should be sure that your fisheye >>>>> mapping corresponds to one of the standard Radiance types. >>>>> >>>>> Best, >>>>> -Greg >>>>> >>>>>> From: raghuram kalyanam <[email protected]> >>>>>> Date: February 6, 2018 5:21:59 AM PST >>>>>> >>>>>> Hi All, >>>>>> >>>>>> I am trying to asses visual discomfort using fisheye HDR images. We >>>>>> generated HDR image from a set of 360 degree LDRs and then converted to >>>>>> fisheye HDR ( using a custom made tools). The intension was to use these >>>>>> Fisheye HDRs as input to Evalglare and get DGP value. The Camera used is >>>>>> Ricoh Theta V 360 degree camera. >>>>>> >>>>>> The problem I am facing is, the DGP calculated from the generated >>>>>> fisheye HDR with Evalglare is always 1.0. We did the calibration but I >>>>>> would like to have expert opinion from you people, what is going wrong >>>>>> with these set of images. Here is the link to the pictures. >>>>>> >>>>>> It would be great if anyone could identify the issue. >>>>>> >>>>>> Best Regards, >>>>>> Raghu >>
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