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HOW-TO: Editing underwater photos

You've bought an underwater camera and you didn't buy an external flash. You took it on a dive trip. You took more photos than you knew what to do with and with the exception of three, they are all green and blue and ugly. There's no substitute for a good flash, but, there are some things you can do to bring those photos back to life. With the help of a little Photoshop, this guide, and a little practice, you will be amazed.

 

depthWhy do the photos look so washed out?

Its immediately obvious that the deeper you go, the darker it gets. Thats part of it but the real problem is how the color spectrum is absorbed at depth.
 
By the time youve passed the 15ft mark, the color red is basically gone. Thats why the deeper you go, the more the photos look washed out. At 120 ft, youll be lucky to get almost any colors at all. The best option is always an external flash, or, barring that, a red filter, but if youve ended up taking photos with neither youll need to do some post processing.

Take a look at the photo below. It was shot without an external flash at a depth of about 50ft. As you can see, there is very little color in the image - a slight hint of red on the pillar which looks more like a faded orange than a red. In person, it was popping with color. So, how do you take a photo like this one and make it look decent?


 

gadling_howto_original


Show me how!

Fortunately, the process is simple. I believe the person who first documented this method was David Kusner in an online post. Since then, his method has been tweaked by others. The method below is the best method Ive seen to date.

  Make a backup of your existing image just in case. Load or copy the image into Photoshop.

  Create two duplicate layers by going to the layer function and selecting duplicate layer. This will create a total of three identical layers. If you dont change the name, the layers will be named Layer 1 (the original image), Layer 1 copy and Layer 1 copy 2, as depicted in the image below:

 

gadling_howto_1


  Select the middle layer (Layer 1 copy), and fill it with 50% gray by going to Edit->Fill and selecting 50% Gray.

gadling_howto_2


  After you have filled the middle layer with gray, you should see three layers with the middle layer completely gray.

gadling_howto_3


  Now select the top layer (Layer 1 Copy 2) and change its blending mode to Luminosity. Merge that layer down with the middle layer so that only two layers remain. You should see a B/W image of your original image.

  Create a new layer on top of your existing layers and fill this layer with red. To do this, select your foreground color and set the color to R: 255 G: 0 B: 0.

  Use the Edit->Fill->Foreground Color to make this new layer completely red.

  Change the new all red layer blending mode to Multiply. If youve done this correctly you should see three layers. A top layer completely red, a middle gray layer and the original layer of your image. 

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  Merge the top layer (layer 2) down into the second layer (layer 1 copy). You can do this by selecting Merge Down from the layer menu. You should now have a very dark red image of your photo. 

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  Set the merged layers (Layer 1 Copy) blending mode to Screen.

  Merge that layer down to the final layer.

  Run Auto Levels by selecting Image->Adjust->Auto Levels.

Hows it look?
 

Fixed_gadling_howto


Much better isnt it? You cant add back what was never there, so the color of the pillar isnt the popping red I hoped for. If the image appears overexposed try playing with the brightness and contrast settings in Photoshop to achieve the desired affect. With a little practice, youll be achieving great results in no time. 

original_fish_gadling_howto

fishfixed

Next week we will talk a little more about some other things you can do to photos to make them look nicer. See below for a teaser .

sunset

sunsetfixed

 

 



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