Too Blue? Make it Black and White

One of the major problems in underwater photography is the loss of color as you descend. The water filters out the red end of the spectrum, creating the blue world all divers are familiar with.

Visually this is a problem, divers are unable to appreciate the beautiful colors of marine life without using an artificial light source. Most divers carry lights, even on daytime dives, for this reason. It can be quite dramatic to turn on a light and watch brilliant reds and yellows appear where there was little color without the light.

Blue Manta with Histogram
A blue manta photographed at 40ft depth

Photographically it is even more challenging, a strobe can light up nearby objects, revealing the colors. For more expansive scenes even the most powerful strobes fail, resulting in photographs heavy in greens and blue, with very little red. For some photos, the blue works, a “true” representation of what was seen. Often the blue does not work, the resulting photograph is an unattractive blue tinged with green, that no amount of fiddling in Photoshop will salvage.

One method in dealing with the loss of color balance is to simply take the loss further, convert the image to a black and white photograph. This is a technique you will see used in underwater photography quite often. By removing the distraction of color, the viewer is able to focus on the subject. The same reason so many modern photographers eschew color, even in an age when wonderful saturated colors are easily reproduced.

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Fall Equinox

Fall equinox occurs today at 10:44HST. Today there will be little difference between the length of the night compared to number of daylight hours. This is the first day of fall as marked by many cultures in the northern hemisphere.

2013 Solstices and Equinoxes
  UT HST
Perihelion Jan 2 00:59UT Jan 1 14:59HST
Spring Equinox Mar 20 11:02UT Mar 20 01:02HST
Summer Solstice Jun 21 05:04UT Jun 20 19:04HST
Apehelion Jul 5 18:59UT Jul 5 08:59HST
Fall Equinox Sep 22 20:44UT Sep 22 10:44HST
Winter Solstice Dec 21 17:11UT Dec 21 07:11HST
 
Source: NASA Sky Calendar

 

Postcard from the Reef – Night Colors

Many reef fish change color for the night. Many lose their bright daytime colors to become rather drab, most likely in order to evade the predators who scour the reef at night. Moray eels, reef sharks, and more are on the hunt, looking for the fish hiding in the nooks and crannies of the reef. For the diver a nighttime reef it totally different, the clouds of fish hovering over the coral are gone. Here and there a few fish are visible, the color seemingly drained from them as they wait out the night.

Longnose Butterflyfish
A longnose butterflyfish (Forcipiger flavissimus) in nighttime coloration during a night dive at Puakō

Full Moon

Full Moon
Full Moon taken 27Aug2007, 90mm f/12 APO and Canon 20Da
Full Moon will occur today at 01:13HST.

A penumbral lunar eclipse will occur this Full Moon. With a penumbral magnitude of 0.76 this is a relatively deep penumbral eclipse which should create a nice shadow effect across the Moon. Unfortunately none of this eclipse is visible from the central Pacific Ocean.

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