Regarding your second question, I don't believe the assumed illuminant has much influence on luminance readings. You can safely ignore it in most cases. But yes, EE white is CIE (x,y) = (1/3,1/3).
Cheers, -Greg > From: "Morsink, K." <[email protected]> > Date: July 27, 2017 8:22:59 AM PDT > > Hi Greg, > > Thank you for your quick response! > > The formula you provided works for me with a single LDR image and thus a > single exposure time, but I'm stuck in how I should insert the multiple > exposure times (of the 7 LDR images to form the HDR image) in exposure_secs > and get the correct EXPOSURE, could you maybe explain this further? > > Making use of the equal-energy illuminant E, is it assumed that the white > point remains constant (1/3, 1/3)? I'm asking this since I'm taking outdoor > photographs, where the CCT (and thereby the white point) changes constantly, > assuming a constant white point would therefore affect the accuracy of the > conversion to luminance values. > > Kind regards, > Kars _______________________________________________ HDRI mailing list [email protected] https://www.radiance-online.org/mailman/listinfo/hdri
