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[Bug 679977] Re: Add support for EXIF colour balance data

To: hugin-devs@xxxxxxxxxxxxxxxxxxx
From: Yuv <679977@xxxxxxxxxxxxxxxxxx>
Date: Mon, 03 Jan 2011 01:35:22 -0000
Reply-to: Bug 679977 <679977@xxxxxxxxxxxxxxxxxx>
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** Tags added: exif

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https://bugs.launchpad.net/bugs/679977

Title:
  Add support for EXIF colour balance data

Status in Hugin - Panorama Tools GUI:
  Triaged

Bug description:
  (This is a short project suitable for an initial Hugin patch)

Hugin currently reads photo EXIF metadata for aperture, shutterspeed and ISO setting, it uses this to initialise the EV parameter for each photo, this is useful for bracketed sets and for situations where the camera was set to 'auto-exposure'. It then sets a global project-wide EV parameter to the average of all these EV settings.

Something similar can be done for colour-balance EXIF metadata, however Hugin doesn't have (or need) a global colour balance setting.

Hugin should be patched to read the EXIF WBRedLevel and WBBlueLevel for input photos, these are unitless and can be used as scale factors for the Er and Eb parameters for each photo. Since Hugin doesn't have a global colour balance setting, the Er and Eb parameters need to be each scaled relative to the average WBRedLevel and WBBlueLevel of all photos in the project.