HDRComposition for Bloom Repair

[Mike Reid]

I'm wondering if anyone has an example of getting this to work properly?  I have a stacked linear image with many blooms and another stacked linear image of shorter exposure without blooms and I have played around with the setting in HDRComposition but always get blooms showing through to the output image.  Also, there is severe posterization in the resulting image.

Any tips much appreciated.

Thanks,
Mike

[georg.viehoever]

The posterization may be an artifact of STF: It can only handle a limited dynamic range that may be exceeded by an image with HDRComposition. It happens if you need to move the sliders extremely close to the left side. Try using the HistogramTransform instead to see if there is real posterization.
Georg

[vicent_peris]

Hi Mike,

Just set the mask growth parameter to a high value (perhaps 7 - 8 pixels?). Usually the blooms don't have sharp edges, so it is needed to growth the composition mask to completely cover these edges.

Best regards,
Vicent.