diff --git a/.gradle/4.10/fileChanges/last-build.bin b/.gradle/4.10/fileChanges/last-build.bin
new file mode 100644
index 0000000..f76dd23
Binary files /dev/null and b/.gradle/4.10/fileChanges/last-build.bin differ
diff --git a/.gradle/4.10/fileHashes/fileHashes.lock b/.gradle/4.10/fileHashes/fileHashes.lock
new file mode 100644
index 0000000..63f5096
Binary files /dev/null and b/.gradle/4.10/fileHashes/fileHashes.lock differ
diff --git a/.gradle/4.10/gc.properties b/.gradle/4.10/gc.properties
new file mode 100644
index 0000000..e69de29
diff --git a/README.md b/README.md
index 0624b17..a51bc1a 100644
--- a/README.md
+++ b/README.md
@@ -36,4 +36,67 @@ if you use maven, you can put it `${project.basedir}/libs`, and edit config file
 </dependency>
 ```
 
-The usage of api, you can see example cases in `src/main/java/example`.
\ No newline at end of file
+The usage of api, you can see example cases in `src/main/java/example`.
+
+
+
+## Compiling the native library
+
+download source code of [webp project of Luciad](https://bitbucket.org/luciad/webp-imageio) , and unzip it.
+
+```shell
+wget https://bitbucket.org/luciad/webp-imageio/get/873c5677244b.zip -O luciad-webp-imageio-873c5677244b.zip
+unzip luciad-webp-imageio-873c5677244b.zip
+```
+
+download source code of [google webp project](https://chromium.googlesource.com/webm/libwebp)
+
+```shell
+git clone https://chromium.googlesource.com/webm/libwebp
+```
+
+or use the [mirror repo](https://github.com/webmproject/libwebp) 
+
+copy folder libwebp into folder luciad-webp-imageio-873c5677244b, and create a directory called `build` in the  folder luciad-webp-imageio-873c5677244b
+
+folder tree like this:
+
+```
+luciad-webp-imageio-873c5677244b/
+	|_ build/	<-- just created 
+	|_ gradle/
+	|_ src/
+	|_ libwebp/  <-- copy from project libwebp 
+	|_ .hgignore
+	|....
+	|.... (other files)
+```
+
+Install CMake 2.8 or newer. CMake can be downloaded from [www.cmake.org](http://www.cmake.org/) or installed using your systems package manager. if you use Win10 and VS 2019, it need CMake 3.14 or newer.
+
+Open a terminal and navigate to the newly created 'build' directory. 
+
+```
+cd ./build
+cmake ..
+cmake --build .
+```
+
+The compiled library can be found under the directory `build/src/main/c`
+
+if you need specific the generator-name, please add `-G <generator-name>` parameter for cmake, like this
+
+```shell
+// cmake ..
+cmake .. -G "Visual Studio 16 2019"
+```
+
+
+
+## Compiling the Java library
+
+- Run `./gradlew build -x test` in the root of the project
+- The compiled Java library can be found under the `build` directory
+
+
+
diff --git a/src/main/resources/META-INF/lib/windows_64/webp-imageio.dll b/src/main/resources/META-INF/lib/windows_32/webp-imageio-1.0.3.dll
old mode 100755
new mode 100644
similarity index 55%
rename from src/main/resources/META-INF/lib/windows_64/webp-imageio.dll
rename to src/main/resources/META-INF/lib/windows_32/webp-imageio-1.0.3.dll
index 61bab7a..bb711e3
Binary files a/src/main/resources/META-INF/lib/windows_64/webp-imageio.dll and b/src/main/resources/META-INF/lib/windows_32/webp-imageio-1.0.3.dll differ
diff --git a/src/main/resources/META-INF/lib/windows_32/webp-imageio.dll b/src/main/resources/META-INF/lib/windows_32/webp-imageio.dll
deleted file mode 100755
index 3811223..0000000
Binary files a/src/main/resources/META-INF/lib/windows_32/webp-imageio.dll and /dev/null differ
diff --git a/src/main/resources/META-INF/lib/windows_64/webp-imageio-1.0.3.dll b/src/main/resources/META-INF/lib/windows_64/webp-imageio-1.0.3.dll
new file mode 100644
index 0000000..4ef18e5
Binary files /dev/null and b/src/main/resources/META-INF/lib/windows_64/webp-imageio-1.0.3.dll differ
diff --git a/test_pic/test_.webp b/test_pic/test_.webp
new file mode 100644
index 0000000..3a06522
Binary files /dev/null and b/test_pic/test_.webp differ