_firstImage(firstImage),

_lastImage(lastImage) {

registerInput(_stack, "stack");

registerOutput(_subStack, "stack");

_subStack->clear();

LOG_ALL(substackselectorlog)

<< "selecting substack from stack of size "

<< _stack->size() << std::endl;

LOG_ALL(substackselectorlog)

<< "first section is " << _firstImage

<< ", last section is " << _lastImage

<< std::endl;

unsigned int lastImage = (_lastImage <= 0 ? _stack->size() - 1 + _lastImage : _lastImage);

LOG_ALL(substackselectorlog)

<< "set last section to " << lastImage

<< std::endl;

if (lastImage > _stack->size() - 1) {

LOG_ERROR(substackselectorlog)

<< "parameter last section (" << lastImage << ") "

<< "is bigger than number of images in given stack -- "

<< "will use " << (_stack->size() - 1) << " instead"

<< std::endl;

lastImage = _stack->size() - 1;

}

for (unsigned int i = _firstImage; i <= lastImage; i++)

_subStack->add((*_stack)[i]);