How to stretch to nearest or interpolate inbetween pixels in a logarithmic audio spectrum converted to a picture in Visual Studio using C# Console

[Winston-17]

I'm trying to program a code to convert an audio to an image spectrogram in the scale of logarithmic, but black lines come up. I search for help, I ask 4 different AI chatbots for help, and though it gave me some correct code, it gave wrong or broken code with this problem, Microsoft's Forum told me to go here, and running out of options, I have no choice but to ask for help here. Here is my code;
`using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using NAudio.Wave;
using MathNet.Numerics;
using MathNet.Numerics.IntegralTransforms;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;

class Program
{
static void Main(string[] args)
{

    string filePath = @"C:\Users\seven\Music\sound.wav";
    int fftLength = 4096; // FFT length

string spectrogramPath = @"C:\Users\seven\Music\spectrogram.bmp"; // Path for the spectrogram image
string modifiedSpectrogramPath = @"C:\Users\seven\Music\modified_spectrogram.bmp"; // Path for modified spectrogram

using (var reader = new AudioFileReader(filePath))
{
var samples = new float[reader.Length / sizeof(float)];
reader.Read(samples, 0, samples.Length);

var spectrogram = GetLogSpectrogram(samples, reader.WaveFormat.SampleRate, fftLength);

SaveSpectrogramImage(spectrogram, fftLength / 2, spectrogramPath);
}

ScalePart(@"C:\Users\seven\Music\spectrogram.bmp", modifiedSpectrogramPath);
}

static double[,] GetLogSpectrogram(float[] samples, int sampleRate, int fftLength)
{
int numSpectrogramRows = fftLength / 2;
int numSpectrogramColumns = (samples.Length / fftLength) * 2;
double[,] spectrogram = new double[numSpectrogramRows, numSpectrogramColumns];

for (int i = 0; i < numSpectrogramColumns; i++)
{
int offset = i * fftLength / 2;
if (offset + fftLength >= samples.Length)
break;

var buffer = samples.Skip(offset).Take(fftLength).Select(s => new Complex32(s, 0)).ToArray();
Fourier.Forward(buffer, FourierOptions.NoScaling);

for (int j = 0; j < numSpectrogramRows; j++)
{
spectrogram[j, i] = 20 * Math.Log10(Math.Max(buffer[j].Magnitude, 1e-10));
}
}

return spectrogram;
}

static void SaveSpectrogramImage(double[,] spectrogram, int height, string outputPath)
{
int width = spectrogram.GetLength(1);
using (Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format24bppRgb))
{
double max = spectrogram.Cast().Max();
double min = spectrogram.Cast().Min();
double gamma = 3;

for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
int value = (int)((spectrogram[y, x] - min) / (max - min) * 255);
value = (int)(255 * Math.Pow(value / 255.0, gamma)); // Apply gamma correction
System.Drawing.Color color = System.Drawing.Color.FromArgb(value, value, value);
bitmap.SetPixel(x, height - y - 1, color);
}
}

bitmap.Save(outputPath, ImageFormat.Bmp);
}
}

static void ScalePart(string inputPath, string outputPath)
{
using (var image = SixLabors.ImageSharp.Image.Load(inputPath))
{
int originalHeight = image.Height;

using (var outputImage = new Image(image.Width, originalHeight))
{
for (int x = 0; x < image.Width; x++)
{
for (int y = 0; y < originalHeight; y++)
{
double logScaleY = Math.Log(y + 1) / Math.Log(originalHeight + 1); // Normalized logarithm
int newY = (int)(logScaleY * (originalHeight - 1)); // Transform Y to new position

if (newY < originalHeight)
{
var color = image[x, originalHeight - y - 1]; // The image is flipped for coordinate compatibility
outputImage[x, newY] = color;
}
}
}
outputImage.Save(outputPath);
}
}
}
}`

The black bars at the top I want removed, either by interpolating inbetween lines or stretching the nearest pixel vertically.

AI was giving me such a hard time, I asked Microsoft at after 1:45AM this morning for help after almost a day and a half (give or take the breaks) barely getting it to work at all, even with an alternative, FFMPEG. Now, it has been closer to 2 Days.

This is possible, right? Because even Image Editors can pixelate or interpolate pictures, and warp them in such ways. What is the full code (In this message and what I am trying to achieve)?

If you want to know, I am trying to convert a sound to a logarithmic frequency scale in an image, flip it vertically, redo the frequency, and convert it back to audio, so the pitch is reversed. Many AIs said I could shift the pitch, or resample, or reverse, or flip linearly (Hertz), or use Invert to flip the waveform, but that is not what I want. I basically want to invert the pitch.

These lines might result in additional weird sound, but I want to remove these black stripes and just flip it logarithmically.

Help would be appreciated. If this is the wrong category, please move it to the appropriate category and give me a link to the new path. If someone asked the same thing, please link me there before closing, but I doubt someone asked this question because the AIs programming might not have what I am asking, because nobody is asking.

Thank you for helping.

Quote Mark; Because reverse is slower than forward; it is speed in the negative.

[Winston-17]

[Walms]

YOU COULD LOSE USERS

Sometimes this is a good outcome, I suspect that would be the best possible outcome in this case.

[Winston-17]

"You were never "banned", so not sure why you keep bringing that up."
Oh? No excuse-- Yes I was. On Python, on DigiBirdsOfficial, On SilverLit, On Reddit, On Yahoo! Answers, And I'm sick of this punishment--what you might call "discipline"-- just because I am frustrated. It is just a feeling, we all have feelings. Sometimes, we can't help ourselves, so please just help me.

First of all, again, let me remind you;

It is frustrating asking 4 different AI with broken or incorrect code, asking on Microsoft just to get "This tire does not provide assistance for third-party nuget, you can ask SixLabors for relevant support.", then I try, waiting a week here, and then nothing, having to post again only to get the "This Is A Violation" stuff.

Second of all, Enough with the frustration, and let's try to focus on the positive aspects now, and get this working; How do I remove the black lines? What do I write?

Third of all, there is a glitch when trying to wrap the entire code. Only some is wrapped, the rest shows as part of the normal text. I don't know why, but I did try to repost it and make sure it was in the quote, and it did the same thing.

Last of all, do you need autism to understand?? Ban after ban after ban, it gets frustrating. Of course I'm going to ask to not be banned, and it is still frustrating when people don't listen, because "I have autism", and now your telling me not to? THERE IS NO KNOWN CURE FOR AUTISM!

This is why I didn't want to have to ask on a forum. Do your job, and please, help me. Enough is enough, so please, don't be negative.

[Winston-17]

Sometimes this is a good outcome, I suspect that would be the best possible outcome in this case.

Like Nintendo, YouTube and Google?

[JimBobSquarePants]

@Winston-17

Take a moment here to relax please because, honestly, I'm a little worried about you. Are you telling me here that you have autism?

I'd love to reach an amicable solution here but it's difficult with the way the conversation is going.

Here's the official guide to GitHub Flavored Markdown. Maybe that will help you understanding your formatting errors.

https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#quoting-code

[Winston-17]

"Take a moment here to relax please because, honestly, I'm a little worried about you. Are you telling me here that you have autism?"
Is that all I had to say? Yes I do have autism, so please help me, or I'm the closing question as irrelivent.

"I'm a little worried about you"?
Out of all people, 99% say it, and don't seem to care. It is a long story, but if you need to hear it...

My Dad took me to the hospital TWICE when I was almost half the age I am now, my car my friend said he'd let me use as a clubhouse was towed away by others when I was in my late teens early 20s, and the trailor I was going to use as a next-door house wasn't worked and fixed on by anyone they said they would; not by my brother, not by my uncle, not my cousin, not by ANYONE, and wound up becoming completely unusable and had to be taken away. I'm 25, NOT 18, and it seems like it is a complete lie when EVEN MY THERIPISTS AND KID SHOWS said, "You're all grown up when you are 18, and you can do anything you want." Even my Dad bullied me as a kid and teen, even when I try to help him. I would be laughing and having fun, and he'd say "Knock it off" or "Shut up". I try to talk like an adult to people, and he tells me "Don't Bother Them", he would mock me when I was upset, I'd try to run away because of his over-negativity, got taken by the police, the littlest thing angers him, like accidents, and coincedently, he cussed at his video games, and this went on 90% of the time up until he died when it was around 2018, and I still have haunted nightmares of my Dad 6 years later. He is lucky, because if he did something that irritated me one more time, I may have punched him. I've whipped the belt on his urn. So if I'm negative, I am sorry, but I honestly believe my Dad taught me wrong by bulling me, demanding me, and only 2-3 years after he died, things seem to somewhat get better. But I still got sick of it, sick of the memories, and tell my brother's daughters, to try to debunk, "Don't belive it when people say you can do WHATEVER YOU WANT when your 18". And if that doesn't sound jealous enough, even my Mom prohibits me crossing the street, in fear I will get hit WHEN I LEARNED, KNOW, AS A FACT, TO LOOK BOTH WAYS LIKE ANY TODDLER, and our neighbor next door VISITS US and even SHE CROSSES THE STREET! And what is wrong with toilet-humor, if humor is funny? Won't you laugh if I say, "Cars can pass gas, and needs a bathroom, but it's waste is called exhaust"? Not DigiBirdsOffical, but even Little Live Pets made Gotta Go Flamingo! SilverLit threats to ban me, so... If I do get it for Christmas, I'm getting a used copy of Rescue Penguin, because if they want to be like that, I'm not giving them MONEY, nope, not worth it! And I swear, my Dad's spirit is haunting me. Even my Dad's Mom and my Aunt blocked me off their facebook page, probably where the negativity came from. Everyday, I argue with my Mom, and it isn't even her fault. IS THAT REALLY ALL YOU NEEDED TO HEAR?? THAT I HAVE AUTISM?? I hope this clears up any confusion about why I am so angry. I tried to learn from shows, other people, other users, friends; but it is getting increasingly clear that it is a load of mud, and almost nobody is helping me. With the opposite happening now compared to Dad back then, like Dad telling me "You got to stop being yourself", and more recently my sister saying "Just be yourself", it is no wonder she threw the F-bomb at my Dad about a decade and a half ago when she was closer to my age. Similarly, I accidently shut the door on a bird, Dad spanks me. After Dad, another bird escapes, I have to grab it's tail and almost throw him back in his cage, and Mom thanked me for it because it was a pain in the neck to get him in his cage.

To put a long story short, I cannot be normal, mostly or all because of my Dad, and I am more recently seeing some friends, except some people on my Dad's side. There are some friends I might still talk to on Dad's side, but definitely not my Dad's Mom or that Aunt. I won't say who's name for privacy, but you get the point.

Now that I said I have Autism, and expressed my bum off, please, what code do I write to remove/replace the black lines? What do I write?

[Winston-17]

Here is what I want, all I ask for

[JimBobSquarePants]

The problem here is that what you are asking for really isn't part of the ImageSharp domain. We provide limited computer vision functionality in addition to common image processing functionality but mostly we provide the low-level APIs which allow you to implement your own algorithms.

From your sample code (I reformatted the second sample) It's hard for me to understand whether you have issues simply reading the data from the wave file or whether you need a window function to interpolate between logarithmic values or even if integer casting is causing problems.

Perhaps the code in this library could give you the relevant pointers? Or even provide you the exact functionality you need?

https://github.com/swharden/Spectrogram