Greg, Thank you very much. I was able to trace the problem down. Here
is how Hugin calculates the crop factor:
cropFactor = sqrt(36.0*36.0+24.0*24.0) /
sqrt(sensorSize.x*sensorSize.x + sensorSize.y*sensorSize.y);
The sensor sizes are coming from these tags:
Image Width : 3648
Image Height : 2736
Focal Plane X Resolution : 12493.15068
Focal Plane Y Resolution : 12493.15068
Focal Plane Resolution Unit : inches
And here is what RPP produces:
Exif Image Width : 1842
Exif Image Height : 1380
Focal Plane Resolution Unit : inches
Focal Plane X Resolution : 12493.1506849315
Focal Plane Y Resolution : 12493.1506849315
When I shortened the resolution value using exiftool, Hugin started
appreciating the data, but still calculating crop factor incorrectly
because I modified the image size during conversion. I think I can fix
the resolution conversion function, but I am not sure what to do with
the original image size. I think there should be a more reliable
method to calculate the crop factor.
Aeksey
On May 19, 7:03 am, Greg 'groggy' Lehey <groog...@gmail.com> wrote:
> On Friday, 18 May 2012 at 5:12:26 -0700, AlekseyM wrote:
> > I checked out Raw Photo Processor (RPP) recently and found that Hugin
> > cannot understand some of it's exif data. When I try to load the file,
> > produced by RPP (either tiff or jpeg) it always asks me to enter
> > multiplier, which on the Lens screen is called "crop factor". When I
> > convert the same image with Canon DPP, this does not happen. I tried
> > to evaluate the difference between exif data in the file, produced by
> > RPP and the one, produced by DPP and was not able to find any clue why
> > this may happen. There are some differences, but the data is
> > surprisingly similar. Yet, there is something wrong. I am starting to
> > think that the problem may be in the way Hugin treats exif data. Any
> > ideas? Where I can see how this data is processed by Hugin?
> I had a similar problem with Olympus DSLRs some time ago, and tracked
> it down to the file src/hugin_base/panodata/SrcPanoImage.cpp .
> Depending on the camera, there are various ways to determine the crop
> factor. Take a look and see if you can work out what path your
> camera's data goes through. Potentially hugin can be patched to work
> around the RPP issue; otherwise you could run exiftool to reinstate
> the necessary information.
> Greg
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