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| The following procedure can be used with Adobe Photoshop to adjust underwater photos taken without the cameras internal flash or external strobe. The credit for this process goes to a posting on DigitalDiver.net by David Kusner (nickname - "mandrake"). | |||
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| The process is as follows: | |||
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1) Create 3 duplicate layers of the original photo (Layer > Duplicate Layer > OK) |
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| 2) Make the middle duplicate layer active (second one down in the 'Layers' palette) by single clicking on it in the 'Layers' palette (palette with Layers-Channels- Paths) | |||
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| 3) Fill that layer with 50% gray (Edit > Fill > 50% Gray, 100% opacity, normal) | |||
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| 4) Make the top duplicate layer active by single clicking on it in the 'Layers' palette. Change that layers blending mode to 'Luminosity' (Layer > Layer Style > Blending Options > Blend Mode > Luminosity) Merge that layer down into the middle gray layer. (Layer > Merge Down). You now have a b/w image of your original photo in this layer. | |||
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| 5) Create a new fill layer above this b/w image (Layer > New Fill Layer > Solid Color). Check 'Group with Previous Layer'. Fill this layer with red (R: 255, G: 0, B: 0). Change this layer's blending mode to 'Multiply' (Layer > Layer Style > Blending Options > Blend Mode > Multiply) and merge it down into the previous layer (the b/w image) (Layer > Merge Down). You've now have a reddish photo. | |||
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| 6) Change the blending mode of the reddish photo to 'Screen' (Layer > Layer Style > Blending Options > Blend Mode > Screen) and merge it down into the first duplicate layer (Layer > Merge Down). You've now got your original image with a much nicer red. | |||
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| 7) Run Auto-Levels (Image > Adjustments > Auto Levels). See how you like the results. If not undue them (Edit > Undue Auto Levels) and adjust the 'Contrast' and 'Brightness' individually to your liking. | |||
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| 8) Make adjustments with the Hue/Saturation (Image > Adjust > Hue/Saturation) and Color Balance (Image > Adjust > Color Balance) until you get the desired effect. | |||
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| 9 Adjust the sharpness (Filter > Sharpen > Unsharp Mask). A window will open with three adjustments shown. + or - the adjustments until you are satisfied with the results. | |||
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10) When finished, flatten the layers (Layer > Flatten Image), re-size the image to your specifications and save the photo to the desired location. Never over-ride your original photo as you may want to do something else with it in the future. |
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| Installation of the "underwater.atn" file in Photoshop will allow you to automatically perform the above process from the "Action" palette (except for steps 7, 8, 9 and 10) as shown in the photo below. | |||
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| Install the file in the "Photoshop Actions" folder. The path to that folder is: | |||
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| C:/Program Files/Adobe/Photoshop 6.0 or 7.0/Presets/Photoshop Actions | |||
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| Click here to download the "underwater.atn" file (2.35kb) created by James Connell. | |||
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