From ad6dae42eb1f83983bb4b7b61e54c5c423f2105b Mon Sep 17 00:00:00 2001
From: Patrick Chevalley <pch@ap-i.net>
Date: Sat, 30 Dec 2023 19:32:01 +0100
Subject: [PATCH] Better error message for RGB FITS file from INDI (#1159)

---
 cam_indi.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/cam_indi.cpp b/cam_indi.cpp
index d326d513a..54a8b344e 100644
--- a/cam_indi.cpp
+++ b/cam_indi.cpp
@@ -864,9 +864,15 @@ bool CameraINDI::ReadFITS(CapturedFrame *frame, usImage& img, bool takeSubframe,
     int nhdus = 0;
     fits_get_num_hdus(fptr, &nhdus, &status);
 
+    if (naxis == 3)
+    {
+        pFrame->Alert(_("RGB images are not supported, please switch the INDI driver to Mono"));
+        PHD_fits_close_file(fptr);
+        return true;
+    }
     if (nhdus != 1 || naxis != 2)
     {
-        pFrame->Alert(_("Unsupported type or read error loading FITS file"));
+        pFrame->Alert(_("Unsupported FITS file"));
         PHD_fits_close_file(fptr);
         return true;
     }