Non compressing png writer is ok.

test/image/TestPngReader.cpp

@@ -13,9 +13,17 @@ int main()
 
     const auto path = "/home/jmsgrogan/code/MediaTool-build/bin/test.png";
 
+    File file(path);
+    std::cout << file.dumpBinary();
+
     PngReader reader;
     reader.setPath(path);
     auto image = reader.read();
 
+    for(unsigned idx=0; idx<image->getWidth()*image->getBytesPerRow(); idx++)
+    {
+        std::cout << "Image val: " << idx << " | " << static_cast<int>(image->getDataRef()[idx]) << std::endl;
+    }
+
     return 0;
 }

test/image/TestPngWriter.cpp

@@ -9,8 +9,8 @@
 
 int main()
 {
-    unsigned width = 10;
-    unsigned height = 10;
+    unsigned width = 20;
+    unsigned height = 20;
     unsigned numChannels = 1;
     auto image = Image<unsigned char>::Create(width, height);
     image->setNumChannels(numChannels);
@@ -19,7 +19,8 @@ int main()
     std::vector<unsigned char> data(width*height, 0);
     for (unsigned idx=0; idx<width*height; idx++)
     {
-        data[idx] = 10;
+        unsigned char val = 255 * idx /(width*height);
+        data[idx] = val;
     }
 
     image->setData(data);