HDRI mailing list,
1) I am using Photosphere to examine ³RGB² values of single exposures using
the Histogram function (RGB) to determine which exposures to include or
exclude in ³Make HDR². Is this histogram RGB applying the weighting factor
( R*0.2651 + G* 0.6701 + B*0.0648) to determine the Minimum and Maximum
values reported?
2) Does Photosphere expect the multiple exposures to be loaded sequentially
from the brightest (longest shutter speed) to the darkest (shortest shutter
speed) or vice versa? Will the accuracy be compromised in any manner
depending on the order in which the exposures are loaded?
Thank you,
Kevin Van Den Wymelenberg
Integrated Design Lab Boise, Director
College of Art & Architecture, Assistant Professor
University of Idaho Boise Center
www.uidaho.edu/idl
ph. 208.724.9456 fx. 208.343.0001 306
S. 6th Street Boise, ID 83702
Hi Kevin,
1) The weighting factors are not applied to the individual channels. What you see is a raw histogram of the data values.
2) Photosphere re-orders the images according to their exposure. It makes no difference the order in which they are given to the software.
There is a check box you can use to automatically exclude unneeded exposures, but it sometimes throws out a few of the brightest pixel values. If you want to be sure you lose nothing, just give Photosphere all of your exposures and it will use what it can.
Cheers,
-Greg
···
From: "Van Den Wymelenberg, Kevin" <[email protected]>
Date: January 18, 2012 10:05:35 PM PST
HDRI mailing list,
1) I am using Photosphere to examine “RGB” values of single exposures using the Histogram function (RGB) to determine which exposures to include or exclude in “Make HDR”. Is this histogram RGB applying the weighting factor ( R*0.2651 + G* 0.6701 + B*0.0648) to determine the Minimum and Maximum values reported?
2) Does Photosphere expect the multiple exposures to be loaded sequentially from the brightest (longest shutter speed) to the darkest (shortest shutter speed) or vice versa? Will the accuracy be compromised in any manner depending on the order in which the exposures are loaded?
Thank you,
Kevin Van Den Wymelenberg