Take a close look at the Ocean.tga image in Figure below. This noise seems fairly mild in the composite, and it may seem unnecessary to take out the grain. However, taking out the grain is the first thing you should do before working on an image. The price you pay further down the image-editing pipeline could be tremendous otherwise.
It is a bit noisy; you want to reduce this.
One of the best ways to test your image for noise is to increase the saturation, give excess sharpness, and use the find edges filter. Take a look at that step by step:
This is a close up of a section of Ocean.tga.
Sometimes, this alone makes any grain or noise pop, and you can determine whether there is enough noise to warrant fixing. Figure below shows what happened when I increased the saturation.
I increased the saturation by a value of 50.The grain is evident
I used the Unsharp mask with a slightly excessive setting.
The Find Edges filter is applied, as you can see in Figurebelow. Notice how the noise is represented by the overall square boxes overlaying and scattered throughout the image. If this test didn’t do much, then you have a clean plate and are fine to start your image editing.
The amount of noise is apparent after using the Find Edges filter.
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Adobe Photoshop Tutorial
Preferences And Settings
Customizing Your Workspace
Starting With Color Maps
Tiling And Transformations
Matte Paintings From Pictures
Quick Fixes For Common Problems
Masks And Mattes
Noise And Grain
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