HDR image display problem

[headdown]

Hello everyone,

Could anyone tell me what is causing the purple circle at the center of M31 in this HDR image?  I have reprocessed it several times, and have changed the STF display to 24 bit LUT, to no avail.  Any advice much appreciated!

Dean

[pfile]

dslr image? processed as RGB?

it may help to split the various masters into R/G/B and do HDRComposition on them separately so that you can adjust the binarizing threshold per-channel.

rob

[headdown]

Thanks Rob,

And yes, Canon 6D and RGB.  The strange thing is that I didn't have the problem the first time around.  The HDR image the first time was composed of 10s, 30s, 2m, 10m, and 20m subs.  I integrated the 5 masters into an HDR image and did not have this problem.  But I felt that I was throwing away a lot of data from the 80 ten minute subs using this method, so second time around I combined the 10m and 20m subs into one master, and the 10s and 30s subs into another.  This left me with 3 masters.  The 10/20m, the 2m, and the 10/30s.  It is when I integrated these into an HDR image that the artifact appeared, so I assume they are related.  But I don't understand how.

Dean