diff --git a/inputsource.cpp b/inputsource.cpp
index 6a6b1c3..6012f1b 100644
--- a/inputsource.cpp
+++ b/inputsource.cpp
@@ -63,7 +63,7 @@ void InputSource::GetViewport(float *dest, int x, int y, int width, int height,
             float re = m_fftw_out[k][0];
             float im = m_fftw_out[k][1];
             float mag = sqrt(re * re + im * im) / m_fft_size;
-            float magdb = 10 * log(mag);
+            float magdb = 10 * log2(mag) / log2(10);
             *dest = magdb;
             dest++;
         }
diff --git a/main.cpp b/main.cpp
index 7b2b5a5..1e821b4 100644
--- a/main.cpp
+++ b/main.cpp
@@ -108,7 +108,7 @@ void wxImagePanel::OnDraw(wxDC &dc)
 
     for (int i = 0; i < height; i++) {
         for (int j = 0; j < width; j++) {
-            pix.Blue() = clamp(256 - input_data[i*width + j] * -2, 0, 255);
+            pix.Blue() = clamp((input_data[i*width + j] + 20) * 5 + 255, 0, 255);
             pix.Red() = 0;
             pix.Green() = 0;
             pix++;