saneuser库正确设置扫描图像的dpi

modules/sane_user/HGSaneImpl.cpp

@@ -1049,6 +1049,7 @@ void HGAPI HGSaneDeviceImpl::ThreadFunc(HGThread thread, HGPointer param)
             HGBase_CreateImageWithData(buffer, &imgInfo, &img);
             if (NULL != img)
             {
+                HGBase_SetImageDpi(img, p->m_dpi, p->m_dpi);
                 p->m_imageFunc((HGSaneDevice)p, img, p->m_imageParam);
                 HGBase_DestroyImage(img);
             }