Qt编程之转换成8,16bit的灰度图

代码大致是下面这样的。是8bit的灰度图，不是16bit。

 QString img_path = "C:\\Users\\Yajun Dou\\Desktop\\test.bmp";
 QImage buff(img_path);
 QImage image;
 uchar* pImageData1 = NULL,*pImageData2 = NULL;

 pImageData1 = buff.bits();

 image = buff.convertToFormat(QImage::Format_Indexed8);

 QVector<QRgb> table();
 for( int i = ; i < ; ++i )
 {
 table[i] = qRgb(i,i,i);
 }

 image.setColorTable(table);

 for(int i =; i< image.width();i++)
 {
 for(int j=; j< image.height();j++)
 {
 QRgb pix_value = image.pixel(i,j);
 image.setPixel(i,j,qGray(pix_value));
 }

 }

 pImageData2 = image.bits();
 image.save("D:\\out.bmp",,);

references:

http://qt-project.org/faq/answer/how_can_i_convert_a_colored_qpixmap_into_a_grayscaled_qpixmap

http://www.qtcentre.org/threads/46596-How-to-convert-a-32-bit-RGB-image-to-8-bit-gray-scale-image

http://www.qtcentre.org/threads/19296-is-there-a-simple-and-quick-way-to-convert-color-images-to-gray-image

http://www.qtcentre.org/threads/15186-QImage-Greyscale-8-bits-pixel

http://stackoverflow.com/questions/15672743/convert-16-bit-grayscale-to-qimage