Hallöchen! Sebastian Kraft writes:
>> For example, see the function at >> https://sourceforge.net/p/lensfun/code/ci/099f390d5d7f0df7ae2242f3bbc5973d29442950/tree/libs/lensfun/mod-coord.cpp#l883 >> >> The "asin" returns a NaN if its argument is larger than 1, which >> means that both iocoord's also become NaN. You cannot recover it: >> For such pixels, there is no counterpart in the sensor image. > > That's a good example. I don't know the value range of inv_dist > but if the x/y are bound to -1..1 the radius sqrt(x^2+y^2) can > easily reach values greater than 1 if inv_dist>sqrt(0.5). > > What is inv_dist meant to be? Inverse distance? How is it > normalized? It is the inverse focal length in normalised units. All input values, x, y, dist, and even inv_dist, are of the order magnitude of 1. But they may well be slightly larger. Tschö, Torsten. -- Torsten Bronger Jabber ID: torsten.bron...@jabber.rwth-aachen.de or http://bronger-jmp.appspot.com ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ darktable-devel mailing list darktable-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-devel
