diff --git a/tests/utils/ImageUtils.cc b/tests/utils/ImageUtils.cc
new file mode 100644
index 0000000..f77ce1e
--- /dev/null
+++ b/tests/utils/ImageUtils.cc
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021 Arm Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ */
+#include "ImageUtils.hpp"
+
+void convertImgIoInt8(void * data, const size_t sz)
+{
+    uint8_t * tmp_req_data          = (uint8_t *)data;
+    int8_t * tmp_signed_req_data    = (int8_t *) data;
+
+    for (size_t i = 0; i < sz; ++i) {
+        tmp_signed_req_data[i] = (int8_t)(
+                (int32_t)(tmp_req_data[i]) - 128);
+    }
+}
+
+void convertImgIoGreyscale(const uint8_t * srcPtr, uint8_t * dstPtr, const size_t sz)
+{
+    for (size_t i = 0; i < sz; ++i, srcPtr += 3) {
+        *dstPtr++ = 0.2989 * (*srcPtr) +
+                    0.587 * (*(srcPtr+1)) +
+                    0.114 * (*(srcPtr+2));
+    }
+}
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