On Tue, Jul 5, 2016 at 6:29 AM, Torsten Bronger <bron...@physik.rwth-aachen.de> wrote:
> But I think the old distortion data referred to JPEG imags, which > may have seen already anti-distortion. Dos the data also work fpr > DNG images? Well, it looks "reasonable" although perhaps over-corrected. Only one way to find out; I'll run a set of distortion images and see. If they're different that does raise the question of how you would like JPG vs. RAW represented in the lensfun database. > Do both cameras have that? The SD1100 and IXUS80 are identical, it's just the US market has to have its own special name. > Matching the EXIF of the camera model or the lens model? Typically, > the lens model field is empty for compact cameras. (I don't know > for CHDK, though.) For the camera. The lens model field is definitely empty, even out of CHDK. I *think* I have it working now, one of those "look away and next time I try, it works" problems. > Just to be sure: Both TCA and vignetting refer to DNGs, correct? Yes, I shot everything in DNG. > If both data is the same, I would give the SD1100 the IXUS 80 mount. > This way, the first simply re-uses all calibrations for the second. Makes sense. >> Note that, as with the IXUS 80, the crop factor is 6.1 for the >> camera and 5.9 for the lens (based perhaps on full area vs. JPEG >> area?) > > Actually, bot must be the same Otherwise, your calibration data > would not be applied accurately. Hmm. I wonder why the existing data says 5.9. 1/2.5" sensor is nominally a 6.02 crop factor. Comparing the FocalLength to FocalLengthIn35mmFilm in the EXIF gives anything from 6.02 to 6.13. DefaultCropSize and the JPG images are 3264x2448; DNG is 3298x2470, matching dimensions from ActiveArea, and ImageWidth x ImageLength is 3336 x 2480. 6.02 to 5.9 is roughly the ratio of 6.02 to 5.9, so the question is which of these sizes is the nominal 1/2.5". ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
