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diff --git a/amber/camera/libhdrplusclient/include/HdrPlusClientUtils.h b/amber/camera/libhdrplusclient/include/HdrPlusClientUtils.h
new file mode 100644
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+++ b/amber/camera/libhdrplusclient/include/HdrPlusClientUtils.h
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+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef HDR_PLUS_CLIENT_UTILS_H
+#define HDR_PLUS_CLIENT_UTILS_H
+
+#include <utils/Errors.h>
+
+#include "HdrPlusTypes.h"
+
+namespace android {
+namespace hdrplus_client_utils {
+
+/*
+ * Write the image buffer to a .ppm file.
+ *
+ * filename is the filename of the .ppm file and should include ".ppm" in the end.
+ * streamConfig is the stream configuration of the buffer.
+ * buffer is the buffer to be saved to a .ppm file.
+ *
+ * Returns
+ *  OK:             if the file is saved successfully.
+ *  BAD_VALUE:      if the format is not support or the stream configuration is invalid.
+ *  NO_INIT:        if it failed to open the file.
+ */
+status_t writePpm(const std::string &filename, const pbcamera::StreamConfiguration &streamConfig,
+        const pbcamera::StreamBuffer &buffer);
+
+/*
+ * Compare the image buffer against a golden .ppm file.
+ *
+ * filename is the filename of the .ppm file and should include ".ppm" in the end.
+ * streamConfig is the stream configuration of the buffer.
+ * buffer is the buffer to be compared.
+ * diffRatio will be the difference ratio between the image buffer and the golden ppm file.
+ *           It's calculated as sum(R, G, B diffs in each pixel) / (width * height * 256 * 3)
+ *
+ * Returns
+ *  OK:             if the comparison completed successfully.
+ *  BAD_VALUE:      if the format is not support or the stream configuration is invalid, or the
+ *                  file cannot be parsed correctly.
+ *  NO_INIT:        if it failed to open the file.
+ */
+status_t comparePpm(const std::string &filename, const pbcamera::StreamConfiguration &streamConfig,
+        const pbcamera::StreamBuffer &buffer, float *diffRatio);
+
+} // hdrplus_client_utils
+} // namespace android
+
+#endif // HDR_PLUS_CLIENT_UTILS_H