Update color space metadata extraction from read image.

First, search AliceVision:ColorSpace metadata in oiio read buf.
If non-existent or invalid search oiio:ColorSpace metadata in read buf.
If still non-existent or invalid use filename to guess the color space by using the oiio::readmetadata function and then the OCIO configuration file if any.

src/aliceVision/image/io.cpp

@@ -182,7 +182,7 @@ bool isValidColorSpace(std::string colorSpace)
 {
     const std::string CSlc = boost::to_lower_copy(colorSpace);
 
-    return (CSlc == "auto") || (CSlc == "linear") || (CSlc == "srgb") || (CSlc == "aces") || (CSlc == "acescg") || (CSlc == "no_conversion");
+    return (CSlc == "auto") || (CSlc == "linear") || (CSlc == "srgb") || (CSlc == "aces2065-1") || (CSlc == "acescg") || (CSlc == "no_conversion");
 }
 
 std::ostream& operator<<(std::ostream& os, EImageColorSpace dataType)
@@ -508,13 +508,17 @@ void readImage(const std::string& path,
 
   if (imageReadOptions.workingColorSpace != EImageColorSpace::NO_CONVERSION)
   {
-      std::string inputColorSpace = inBuf.spec().get_string_attribute("oiio:ColorSpace", "");
-      if (inputColorSpace.empty())
+      std::string inputColorSpace = inBuf.spec().get_string_attribute("AliceVision:ColorSpace", "");
+      if ((inputColorSpace.empty()) || !isValidColorSpace(inputColorSpace))
       {
-          // Try to get color space using filename
-          inputColorSpace = EImageColorSpace_enumToString(getImageColorSpace(path));
+          inputColorSpace = inBuf.spec().get_string_attribute("oiio:ColorSpace", "");
+          if ((inputColorSpace.empty()) || !isValidColorSpace(inputColorSpace))
+          {
+              // Try to get color space using filename
+              inputColorSpace = EImageColorSpace_enumToString(getImageColorSpace(path));
+          }
       }
-      if (EImageColorSpace_stringToEnum(boost::to_lower_copy(inputColorSpace)) != imageReadOptions.workingColorSpace)
+      if ((EImageColorSpace_stringToEnum(inputColorSpace) != imageReadOptions.workingColorSpace) && isValidColorSpace(inputColorSpace))
       {
           std::string outputColorSpace = (imageReadOptions.workingColorSpace == EImageColorSpace::LINEAR) ? "linear" : EImageColorSpace_enumToString(imageReadOptions.workingColorSpace);
           oiio::ImageBufAlgo::colorconvert(inBuf, inBuf, inputColorSpace, outputColorSpace, true, "", "", &colorConfigOCIO);