Roy G Biv explains why a coral at 90 feet deep will have much less red, orange, yellow, than the same coral 10 feet deep. This is why deep water looks deep blue and shallow water looks clear. The farther the light travels the more the color of the light is changed. Not only will it help us see better, it will help us see the beautiful colors of all that underwater life. Us divers know that the deeper we go, the darker it is. blue! It's about distance, not depth!ĭuring our open water scuba diving course, most of us are taught that 'the deeper you go, the more color is lost.' That is true, but it is not complete. If the pool was painted white and then filled with water, the homeowner, expecting the pool to look white, would be very upset to see that his just-filled-up-today-with-clean-water-pool appears. Have you ever noticed that swimming pools are always painted blue? They are painted blue so that the homeowner will expect the pool to look blue. All water absorbs light according to the rules of Roy G. No matter how clean your water is, if you have enough of it, it will appear blue. Your glass of water just is not big enough to have enough effect that you can readily see it. After travelling 10 meter through 'coastal ocean water' the blue light will now be relatively 58 times more intense than red light! But, I Just Poured a Glass of Water and it is Perfectly Clear It's Not Blue! Blue light will have 35% of its intensity remaining, but red light will only have 0.6% of its intensity remaining. Studying the charts further, let's look at the relative strengths of light after travelling 10 meter (33 feet) through the same pure ocean water. The blue light, relative to red light, is approximately 1+1/2 times 'too strong.' You should be easily able to adjust for that differene in the camera with 'white balance' adjustment. It is fairly well documented that after travelling through 1 meter (3 feet) of "coastal ocean water," blue light will still have 90% of its intensity, but red light will have only 60% of its intensity. We will explain the relative effects of color change of light travelling through water based upon an article published by Texas A&M's Department of Oceanography. Next is orange orange is not affected as much as red, but it is affected more than all of the other colors. At the beginning of that list is red, and red is affected more than any other color through water. It is also the order that they fade as we look through water. It's not just the colors we underwater photographers want to remember, it is the order in which they make up Mr. Biv is an acronym for Red Orange Yellow Green Blue Indigo Violet - the colors of the rainbow. Though Roy is not a real person, you may want to learn and remember how he was given his name.
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