diff --git a/panda/src/pnmimage/convert_srgb.I b/panda/src/pnmimage/convert_srgb.I
index 57d8d42170..f49cc38203 100644
--- a/panda/src/pnmimage/convert_srgb.I
+++ b/panda/src/pnmimage/convert_srgb.I
@@ -153,3 +153,17 @@ encode_sRGB_uchar(const LColorf &color, xel &into, xelval &into_alpha) {
   into_alpha = (xelval) (color[3] * 255.f + 0.5f);
 #endif
 }
+
+
+/**
+ * Double-precision versions of the above.
+ */
+INLINE void
+encode_sRGB_uchar(const LColord &color, xel &into) {
+  return encode_sRGB_uchar(LCAST(float, color), into);
+}
+
+INLINE void
+encode_sRGB_uchar(const LColord &color, xel &into, xelval &into_alpha) {
+  return encode_sRGB_uchar(LCAST(float, color), into, into_alpha);
+}
diff --git a/panda/src/pnmimage/convert_srgb.h b/panda/src/pnmimage/convert_srgb.h
index dada8918b3..86bc8b07bf 100644
--- a/panda/src/pnmimage/convert_srgb.h
+++ b/panda/src/pnmimage/convert_srgb.h
@@ -46,6 +46,11 @@ EXPCL_PANDA_PNMIMAGE INLINE void encode_sRGB_uchar(const LColorf &from,
 EXPCL_PANDA_PNMIMAGE INLINE void encode_sRGB_uchar(const LColorf &from,
                                                    xel &into, xelval &into_alpha);
 
+EXPCL_PANDA_PNMIMAGE INLINE void encode_sRGB_uchar(const LColord &from,
+                                                   xel &into);
+EXPCL_PANDA_PNMIMAGE INLINE void encode_sRGB_uchar(const LColord &from,
+                                                   xel &into, xelval &into_alpha);
+
 // Use these functions if you know that SSE2 support is available.  Otherwise,
 // they will crash!
 #if defined(__SSE2__) || defined(__i386__) || defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64)