18436Re: White (Neutral) Balance in Panoramas
- Mar 4, 2008--- In PanoToolsNG@yahoogroups.com, Snowy Aldon <lists@...> wrote:
> It seems strange that the velvet gives a neutral value whenYou have to be careful which patch of velvet you use. Some are not black.
> illuminated to be in the mid-tone. I would have have supposed that
> the colour bias of the dyes would become apparent and introduce a cast.
> Do you colour balance/correct/neutralise to the velvet and adjust theWe do not use the box-of-velvet anymore, as our "4 patches of velvet" at different
> images to give an equal RGB value grey? And how does achieving a
> truly "black" black give any information regarding the colour balance
> of the image?
orientations works very well. Some of the patches look blacker than others, and some can
be used as gray-level samples.
Having an in-scene black is useful if you are shooting on film (as we usually do - Seitz
Super Roundshot 220).
Having specular (over-exposed) white patches are not useful, so we use a variety of
techniques in Photoshop to set the top white level.
In the end, the velvet-patches are a short-cut to getting NEAR to correct colour, and we
use Photoshop to adjust the colour to "Correct" levels by eye and memory.
Hope this helps.
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