Peach Pit
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Sep 10, 2007, 2:44 AM
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Retreiving lost Colour Information from Photographs.
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Right. Ever try taking a picture of something and have some of the detail you want washed out by the flash, over/under exposure, or having a mis judged F-stop? This small guide will give you a hand.
Right, so here is my newly opened picture of my tummy after my soccer tournnament (click here to find out why I posted this).
Looking at this, I can barely see the outline of the soccer ball above my belly button to the left. I want to retreive some of the lost colour data there, so I can enhance the outline.
Click the channels menu.
Now click on the Red colour channel. What this does is cut out the blue and green colour information and displays only the red. The detail that you lost might be hiding under the green or blue colour information. Now click on the green, and then the blue colour channels. Decide which colour channel gives you back the most detail that you are looking for. In this case, the green channel is the one I will be using. Select the channel with the most detail, and then select all. Copy the colour channel:
Deselect your selection using Control-D. REMEMBER TO RE-SELECT THE RGB COLOUR CHANNEL BEFORE PROCEEDING. Click back on the layers menu and create a new layer:
Paste your selection onto the new layer. Time for another decision. Scroll through the blending modes on the new layer. Whichever blending mode best suits the detail you want is the one you should use. If you are trying to bring out the colour in the green channel, try using multiply. If you are using red, Pin Light, or Soft Light. Want some blue channel action? Try Colour Burn or Linear Burn.
I used multiply:
I put red lines in where there was a visible outline in the before and after pictures. Before is on the bottom.
If you want to go a step further, you can continue to copy and paste new colour channels on top of each other for maximum effect, or even copy portions of the colour channel to minimize colour distortion.
Knock yourselves out.
bye.
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