Fix laoding 16 bit signed files

loadrunable.cpp

@@ -184,6 +184,7 @@ bool loadFITS(QString path, ImageInfoData &info, RawImage **image)
         int naxis;
         long naxes[3] = {0};
         fits_get_img_param(file, 3, &imgtype, &naxis, naxes, &status);
+        fits_get_img_equivtype(file, &imgtype, &status);
 
         if(naxis >= 2 && naxis <= 3 && status == 0)
         {
@@ -198,6 +199,10 @@ bool loadFITS(QString path, ImageInfoData &info, RawImage **image)
                 fitstype = TBYTE;
                 break;
             case SHORT_IMG:
+                cvtype = CV_16S;
+                fitstype = TSHORT;
+                break;
+            case USHORT_IMG:
                 cvtype = CV_16U;
                 fitstype = TUSHORT;
                 break;
@@ -219,6 +224,8 @@ bool loadFITS(QString path, ImageInfoData &info, RawImage **image)
                 cv::Mat tmp(h, w, cvtype);
                 fpixel[2] = i;
                 fits_read_pix(file, fitstype, fpixel, size, NULL, tmp.ptr(), NULL, &status);
+                if(cvtype == CV_16S)
+                    tmp.convertTo(tmp, CV_16U, 1, 32767);
                 cvimg.push_back(tmp);
             }