workgroupengineering
diff --git a/‎README.md‎
Lines changed: 4 additions & 4 deletions b/‎README.md‎
Lines changed: 4 additions & 4 deletions
diff --git a/‎dev/graphics/halMel-LinearCropped.png‎
90.3 KB b/‎dev/graphics/halMel-LinearCropped.png‎
90.3 KB
diff --git a/‎dev/graphics/halMel-MelScale.png‎
30.6 KB b/‎dev/graphics/halMel-MelScale.png‎
30.6 KB
diff --git a/‎dev/graphics/halMel.png‎
-35.6 KB b/‎dev/graphics/halMel.png‎
-35.6 KB
diff --git a/‎dev/graphics/halMelLinearCropped.png‎
-168 KB b/‎dev/graphics/halMelLinearCropped.png‎
-168 KB
diff --git a/‎dev/graphics/halMelLinearFull.png‎
-78.7 KB b/‎dev/graphics/halMelLinearFull.png‎
-78.7 KB
diff --git a/‎src/Spectrogram.Tests/Mel.cs‎
Lines changed: 12 additions & 5 deletions b/‎src/Spectrogram.Tests/Mel.cs‎
Lines changed: 12 additions & 5 deletions
@@ -132,9 +132,9 @@ Analytical spectrograms aimed at achieving maximum frequency resolution are pres
 
 **To visualize frequency in a way that mimics human perception** we create a spectrogram that represents lower frequencies using a large portion of the image, and condense higher frequency ranges into smaller rows of pixels toward the top of the image. The [Mel Scale](https://en.wikipedia.org/wiki/Mel_scale) is commonly used to represent power spectral density this way, and the resulting _Mel Spectrogram_ has greatly reduced vertical resolution but is a better representation of human frequency perception. 
 
-Cropped Linear Scale (0-1kHz) | Full Linear Scale (0-22 kHz) | Mel Scale (0-22 kHz)
+Cropped Linear Scale (0-3kHz) | Mel Scale (0-22 kHz)
 ---|---|---
-![](dev/graphics/halMelLinearCropped.png)|![](dev/graphics/halMelLinearFull.png)|![](dev/graphics/halMel.png)
+![](dev/graphics/halMel-LinearCropped.png)|![](dev/graphics/halMel-MelScale.png)
 
 Amplitude perception in humans, like frequency perception, is logarithmic. Therefore, Mel spectrograms typically display log-transformed spectral power and are presented using Decibel units.
 
@@ -145,10 +145,10 @@ Amplitude perception in humans, like frequency perception, is logarithmic. There
 // Create a traditional (linear) Spectrogram with dB units
 var spec = new Spectrogram(sampleRate, fftSize: 4096, stepSize: 500, maxFreq: 3000);
 spec.Add(audio);
-spec.SaveImage("hal.png", intensity: 4, dB: true);
+spec.SaveImage("hal.png", intensity: 4);
 
 // Create a Mel Spectrogram with dB units
-Bitmap bmp = spec.GetBitmapMel(melSizePoints: 250, intensity: 4, dB: true);
+Bitmap bmp = spec.GetBitmapMel(melSizePoints: 250, intensity: 4);
 bmp.Save("halMel.png", ImageFormat.Png);
 ```
 
 
@@ -10,16 +10,23 @@ namespace Spectrogram.Tests
     class Mel
     {
         [Test]
-        public void Test_Mel_Spectrogram()
+        public void Test_MelSpectrogram_MelScale()
         {
             (double[] audio, int sampleRate) = TestTools.ReadWavWithNAudio("../../../../../data/cant-do-that-44100.wav");
             int fftSize = 4096;
             var spec = new Spectrogram(sampleRate, fftSize, stepSize: 500);
             spec.Add(audio);
-            //spec.SaveImage("../../../../../dev/graphics/halNotMel.png", 2_000, true);
-            
-            Bitmap bmp = spec.GetBitmapMel(250, 2_000, true);
-            bmp.Save("../../../../../dev/graphics/halMel.png", ImageFormat.Png);
+
+            Bitmap bmpMel = spec.GetBitmapMel(250, 8_000);
+            bmpMel.Save("../../../../../dev/graphics/halMel-MelScale.png", ImageFormat.Png);
+
+            Bitmap bmpRaw = spec.GetBitmap(8_000);
+            Bitmap bmpCropped = new Bitmap(bmpRaw.Width, bmpMel.Height);
+            using (Graphics gfx = Graphics.FromImage(bmpCropped))
+            {
+                gfx.DrawImage(bmpRaw, 0, bmpMel.Height - bmpRaw.Height);
+            }
+            bmpCropped.Save("../../../../../dev/graphics/halMel-LinearCropped.png", ImageFormat.Png);
         }
 
         [Test]