Generic Image Library : channel_invert

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# channel_invert
[Algorithms and Utility Functions]

## Detailed Description

Returns the inverse of a channel. result = max_value - x + min_value.

Example:

    // bits8 == uint8_t == unsigned char
    bits8 x=255;
    bits8 inv = channel_invert(x);
    assert(inv == 0);

## Functions

template<typename Channel>
channel_traits< Channel >::value_type | boost::gil::channel_invert (Channel x)
| Default implementation. Provide overloads for performance.