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Файл примера imagemodel.cpp
itemviews/pixelator/imagemodel.cpp

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 #include <QtGui>

 #include "imagemodel.h"

 ImageModel::ImageModel(QObject *parent)
     : QAbstractTableModel(parent)
 {
 }

 void ImageModel::setImage(const QImage &image)
 {
     modelImage = image;
     reset();
 }

 int ImageModel::rowCount(const QModelIndex & /* parent */) const
 {
     return modelImage.height();
 }

 int ImageModel::columnCount(const QModelIndex & /* parent */) const
 {
     return modelImage.width();
 }

 QVariant ImageModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid() || role != Qt::DisplayRole)
         return QVariant();
     return qGray(modelImage.pixel(index.column(), index.row()));
 }

 QVariant ImageModel::headerData(int /* section */,
                                 Qt::Orientation /* orientation */,
                                 int role) const
 {
     if (role == Qt::SizeHintRole)
         return QSize(1, 1);
     return QVariant();
 }