Update app.py

app.py

@@ -42,7 +42,7 @@ def create_spectrogram_and_get_info(audio_file):
 
     # Create the spectrogram
     plt.specgram(audio_data, Fs=sample_rate / 1, NFFT=4096, sides='onesided',
-                 cmap="viridis", scale_by_freq=True, scale='dB', mode='magnitude', window=np.hanning(4096))
+                 cmap="Reds_r", scale_by_freq=True, scale='dB', mode='magnitude', window=np.hanning(4096))
 
     # Save the spectrogram to a PNG file
     plt.savefig('spectrogram.png')