Fix bug when saving color FITS/XISF files

rawimage.cpp

@@ -351,6 +351,11 @@ uint32_t RawImage::norm() const
     }
 }
 
+uint32_t RawImage::widthBytes() const
+{
+    return m_ch * m_width;
+}
+
 void* RawImage::data()
 {
     return m_pixels.get();
@@ -387,6 +392,11 @@ const void *RawImage::origData(uint32_t row, uint32_t col) const
         return m_pixels.get() + (m_width * row * m_ch + col * m_ch) * typeSize(m_type);
 }
 
+bool RawImage::planar() const
+{
+    return m_planar;
+}
+
 void RawImage::convertToThumbnail()
 {
     if(!valid())
@@ -735,6 +745,7 @@ std::shared_ptr<RawImage> RawImage::fromPlanar(const void *pixels, uint32_t w, u
         convert(static_cast<const double*>(pixels), static_cast<double*>(image->data()), 1);
         break;
     }
+    image->m_planar = false;
     return image;
 }
 
@@ -748,11 +759,11 @@ std::vector<RawImage> RawImage::split() const
     size_t s = size();
     auto extract = [&](auto *in, auto *out, size_t off)
     {
-        for(size_t i=0; i < s; i+=m_ch)
+        for(size_t i=0; i < s; i++)
             out[i] = in[i*m_ch + off];
     };
 
-    for(uint32_t i=0; i<m_ch; i++)
+    for(uint32_t i=0; i<m_channels; i++)
     {
         switch(m_type)
         {