improved documentation for IMREAD_UNCHANGED flag

modules/imgcodecs/include/opencv2/imgcodecs.hpp

@@ -62,7 +62,7 @@ namespace cv
 
 //! Imread flags
 enum ImreadModes {
-       IMREAD_UNCHANGED            = -1, //!< If set, return the loaded image as is (with alpha channel, otherwise it gets cropped).
+       IMREAD_UNCHANGED            = -1, //!< If set, return the loaded image as is (with alpha channel, otherwise it gets cropped). Ignore EXIF orientation.
        IMREAD_GRAYSCALE            = 0,  //!< If set, always convert image to the single channel grayscale image (codec internal conversion).
        IMREAD_COLOR                = 1,  //!< If set, always convert image to the 3 channel BGR color image.
        IMREAD_ANYDEPTH             = 2,  //!< If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.