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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.
Why 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?
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:
Select the middle layer (Layer 1 copy), and fill it with 50% gray by going to Edit->Fill and selecting 50%
Gray.
After you have filled the middle layer with gray, you should see three layers with the middle layer completely
gray.
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.
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.
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?
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.
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 .
Filed under: Learning, Scuba Diving, Photos, Stories








Reader Comments (Page 1 of 1)
Usman Dec 18th 2005 5:12PM
Great post! Looking forward to future Photoshop tips.
cosimo Dec 18th 2005 5:12PM
If you have any samples on your photos, it would be cool to see em!
Jennifer Browning Dec 18th 2005 5:12PM
Great post. I am hopefully going to take some digital shots at the Texas Flower Gardens on the first weekend of March, so some editing tips in PS will help! Also if you want to have more control over the levels you can manually adjust them instead of doing auto levels. It gives you a little more control. You just go to Image>Adjustments>Levels. From the pull down menu will say RGB. You might notice a mountain like graph. If there are large blank spaces on each side of the mountain do the following:
From the pulldown menu select the Red Channel click and hold down the down left triangular arrow . Drag that arrow just as the curve is going up the "mountain". Take the right triangular arrow and do the same. Do this with the Blue and the Green Channel and you will have some color correction.
axel taillieu Dec 18th 2005 5:12PM
Nice effect, indeed. I have the same issue but not with pictures but with some underwater movies I took without strobes. Could this type of filter be applied to movies (rushs) in Abobe Premiere 6.5?
If yes, do you know how to proceed?
Thanks and best regards,
Axel
Luis Dec 18th 2005 5:12PM
how can i do the same with video
thanks