>> void GradientLut::setDepth(size_t depth) {
>>     lut.resize(depth);
>> }

>>     if(index >= size) {
>>         index = size - 1;
>>     }

>> /**
>>  * Get a color value for a given position in the table.
>>  * The index in the table will be calculated proportionally to the depth
>> of the
>>  * LUT.
>>  */
>> const GradientLut::Color& GradientLut::operator[](double pos) const {
>>     unsigned int size = lut.size();
>>     unsigned int index = (double)size * pos;
>>     if(index >= size) {
>>         index = size - 1;
>>     }
>>     return lut[index];
>> };

>> inline void Ndvi::setColor(uint8_t *sample, double index)
>> {
>>     double pos = N2P(index);
>>     const GradientLut::Color& falseColor = gradient[pos];

>> Ndvi::setColor (index=<optimized out>, sample=0x3cc4270 "",
>> this=0x38a3e70) at filter/ndvi/ndvi.cpp:236
>> 236        sample[0] = falseColor.r;