[Coral-List] Color correction card
russell at BYOGUIDES
russell at BYOGUIDES
Fri Feb 1 04:51:24 UTC 2019
When acquiring images for the Coral Finder we started out using a 15 x4 cm Kodak style multi chip colour strip with scale. But after a while we realised it was starting to influence the exposure of the images - especially the close ups and mid shots.
So we shifted to the to a black / mid grey / white 5 x 1cm strip. Any post production software will let you set black and white points, white balance etc for colour correction. When shooting a coral ID sequence I shoot wide, mid and closeup - I then shoot an additional CU with the scale bar. In post I can transfer the white balance and scale to the other images in the sequence as required for publishing / teaching etc.
By separate email I will send you a PDF file to print and laminate it (check for true scale!) then cut them out with a 3mm plastic overlap.
When I go diving I put one up the sleeve of my wetsuit - it usually lasts the whole trip. And you don’t cry if you lose it.
p.s. whenever I forget to us a scalebar I find shell fragements / halimdeda flakes in the images background work pretty well. What usually doesn’t work are the white dots from flash back scatter.
p.p.s. some corals can not be 'photographed’ - dunno why - they just refuse to shoot in true colour - flash or otherwise
russell at byoguides.com <mailto:russell at byoguides.com>
Recipient 2017 Australian Coral Reef Society Medal for Science Advocacy
Manager: BYOGUIDES (Be Your Own Guide)
Author: Reef Finder <http://www.byoguides.com/reeffinder/> - the world’s first searchable underwater ID smart guide to reef life
Author: Indo Pacific Coral Finder <http://www.byoguides.com/coralfinder/> - the world’s first searchable ID smart guide to corals
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Email: russell at byoguides.com <mailto:russell at byoguides.com>
Writer, project manager, television producer, science communication consultant.
Coral Identification Capacity Building Program
Adjunct Senior Lecturer
College of Science and Engineering
James Cook University
> On 31 Jan 2019, at 2:21 am, Adriana Humanes via Coral-List <coral-list at coral.aoml.noaa.gov <mailto:coral-list at coral.aoml.noaa.gov>> wrote:
> Hi Coral list,
> I'm interested in using a color correction card for taking pictures of
> nubbins kept in tanks exposed to temperature stress. Any suggestions,
> recommendations? I have used in the past the Coral Health Chart but I
> wanted to know of people having experience with color correction cards.
> Thanks in advance,
> Adriana Humanes
> www.adrianahumanes.com <http://www.adrianahumanes.com/>
> Postdoctoral Associate Researcher
> Ridley Building 2
> Newcastle University
> Claremont Road
> Newcastle upon Tyne NE1 7RU
> Telephone: +44 (0)191 208 6441 <+44%20191%20208%206441>
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