Hi Clarence, You should check that you are properly subscribed to the HDRI mailing list with the address you use to post. I had to approve this message before it went through....
If you plot these curves, the two second-order polynomials very nearly overlap, so the small differences in the coefficients do not amount to much. The third-degree polynomial you say you got from Photosphere does not match the others very well, and it is difficult for me to say why without trying to run everything on your image set, myself. The hdrgen tool and Photosphere share much of the same code, but you can get different results based on different inputs as well as random patch selection. Even the same set of images given twice won't necessarily yield the same coefficients, although they should be close. Do the final results look much different? Cheers, -Greg > From: Clarence Wang <[email protected]> > Date: October 23, 2018 9:07:57 AM PDT > > Hi lists, > > I got one more .rsp file as I used 'hdrgen' to generate a hdr image, though a > .rsp file created by Photosphere was originally put together with a sequence > of exposure images in the command line. What is the difference between these > two rsp files? > > The command below was used to generate a hdr image: > #hdrgen -o hdrgen.hdr -r Camera.rsp -q 100 -f -g 3.JPG 4.JPG 5.JPG 6.JPG > 7.JPG 8.JPG 9.JPG 10.JPG 11.JPG > > The Camera.rsp was created and re-ordered manually by extracting the > coefficients of polynomial from a resulted file generated by Photosphere > (from 1.JPG to 9.JPG orderly): > 4 4.034033e+00 -5.855305e+00 3.266977e+00 -4.875296e-01 4.182427e-02 > 4 4.031160e+00 -6.116607e+00 3.593532e+00 -5.563583e-01 4.827316e-02 > 4 3.019587e+00 -4.300016e+00 2.561302e+00 -3.147225e-01 3.385004e-02 > > However, they were different from those in the new .rsp file, which is: > 3 1.83198 -1.23145 0.405249 -0.00578285 > 3 1.73741 -1.13891 0.409955 -0.00844811 > 3 1.66995 -1.05417 0.38908 -0.00486053 > > Furthermore, when the rest of images were added to the command line(say, > using from 3.JPG to 13.JPG), the resulted .rsp file was also different, which > is: > 3 1.81892 -1.20091 0.387124 -0.00514223 > 3 1.7075 -1.09063 0.390775 -0.00765242 > 3 1.71383 -1.11951 0.411146 -0.00546076 > > Any ideas to explain such outcomes? > > Thanks, > > Clarence > _______________________________________________ > HDRI mailing list > [email protected] > https://www.radiance-online.org/mailman/listinfo/hdri
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