7.3 Filtering

Filtering removes noise from an image. In this section, we’ll introduce the concept behind filtering and show you some common techniques.

The Principles of Filtering

Noise occurs in images for several reasons:

  • The photograph was taken in poor conditions; there was not enough light, as in Figure 7-47, or the photographer moved, as in Figure 7-48.

    The result of applying bizarre curves to all channels

    Figure 7-46. The result of applying bizarre curves to all channels

    Noise due to poor conditions

    Figure 7-47. Noise due to poor conditions

    Figure 7-48. Noise because the photographer moved

  • The camera was a very low-cost model with ...

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