fix: convert BGR to RGB after resizing

Author: JakubGonera

packages/react-native-executorch/common/rnexecutorch/data_processing/ImageProcessing.cpp

@@ -130,7 +130,6 @@ std::pair<TensorPtr, cv::Size>
 readImageToTensor(const std::string &path,
                   const std::vector<int32_t> &tensorDim) {
   cv::Mat input = imageprocessing::readImage(path);
-  cv::cvtColor(input, input, cv::COLOR_BGR2RGB);
   cv::Size imageSize = input.size();
 
   if (tensorDim.size() < 2) {
@@ -146,6 +145,8 @@ readImageToTensor(const std::string &path,
 
   cv::resize(input, input, tensorSize);
 
+  cv::cvtColor(input, input, cv::COLOR_BGR2RGB);
+
   return {imageprocessing::getTensorFromMatrix(tensorDim, input), imageSize};
 }
 } // namespace imageprocessing

packages/react-native-executorch/common/rnexecutorch/data_processing/ImageProcessing.h

@@ -24,6 +24,7 @@ std::vector<float> colorMatToVector(const cv::Mat &mat);
 cv::Mat bufferToColorMat(const std::span<const float> &buffer,
                          cv::Size matSize);
 std::string saveToTempFile(const cv::Mat &image);
+/// @brief Read image in a BGR format to a cv::Mat
 cv::Mat readImage(const std::string &imageURI);
 TensorPtr getTensorFromMatrix(const std::vector<int32_t> &tensorDim,
                               const cv::Mat &mat);