QImage image;

// ....

gflGetDefaultLoadParams( &load_option );

load_option.Flags |= GFL_LOAD_METADATA;
load_option.Flags |= GFL_LOAD_FORCE_COLOR_MODEL | GFL_LOAD_ORIGINAL_COLORMODEL;
load_option.Origin = GFL_BOTTOM_LEFT;
load_option.ColorModel = GFL_BGRA;
load_option.LinePadding = 4;

// ....

error = gflLoadBitmapFromHandle (QFile("bla bla bla"), &bitmap, &load_option, NULL);

if ( error == GFL_NO_ERROR)
{
unsigned char * data = bitmap->Data;

const unsigned height = bitmap->Height;
const unsigned width = bitmap->Width;
const unsigned pitch = bitmap->BytesPerLine;

QImage::Format format = QImage::Format_RGB32;

QImage tempImage(width, height, format);
tempImage.fill(Qt::black);

// set metrics data
tempImage.setDotsPerMeterX(bitmap->Xdpi);
tempImage.setDotsPerMeterY(bitmap->Ydpi);

for (unsigned y = 0; y < height; ++y)
memcpy(tempImage.scanLine(height - y - 1), (bitmap->Data+(pitch*y)), pitch);

image = tempImage;
}