How can I change the name of the administrator that shows on Home Icon?

Hello
I've bought this laptop from a reliable source, went to the Apple Store (Regent St) with the box and they registered it in my name, address and so on. No problems, the mac works fine.
However, the Home/Icon and administrator is in the name of the old owner. Obviously, he gave me the password. But, I really want to have my name on it.
I've the box, the discs and all the books. Everything is in really good conditions.
I read the manuals, the instructions are straight forward but on the net and forum related mac, I can see that are lots of people having problems when they reboot and are unable to login and so on...
The genius bar at the Apple Store is okay, but the staff main objective is to sell and they are not very patient and neither have much time for you. Normally I end up leaving the store with software that I don't have a clue how to use and the problem unsolved. And it stresses me out.
Can someone help me please.
Thank you
Best regards

1. Yes, just the Shortname will be changed.
2. Not easier, but you can do that if you wish.
since I'm in the official Mac support forum should I expect to receive a reply from a Mac expert staff or it is unlikely to happen?
Just other Users here like you, trying to help other users. For a real Apple answer I think you have to call AppleCare, but rarely an Apple Host pops in... wouldn't expect it in this case though.
I do thank you for the info about your software and obviously will make a donation if everything works fine.
Not mine, but a worhy piece of SW just the same.

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This is the method:
public static Bitmap[] get_images_with_clouds(Bitmap radar_image)
int e = 0;
int f = 0;
int image_clock_area_x = 0;
int image_clock_area_y = 0;
int image_clock_area_x1 = 140;
int image_clock_area_y1 = 21;
Bitmap[] localImages;
localImages = new Bitmap[15];
Bitmap image;
image = new Bitmap(Properties.Resources.radar_without_clouds);
BitmapData bmD = null;
BitmapData bmD2 = null;
try
bmD = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
bmD2 = radar_image.LockBits(new Rectangle(0, 0, radar_image.Width, radar_image.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
IntPtr sc0 = bmD.Scan0;
unsafe
int* p = (int*)sc0.ToPointer();
int* p2 = (int*)bmD2.Scan0.ToPointer();
for (e = image_clock_area_x; e < image_clock_area_x + image_clock_area_x1; e++)
for (f = image_clock_area_y; f < image_clock_area_y + image_clock_area_y1; f++)
Color clock_color = Color.FromArgb(p2[e + f * bmD2.Width]);
p[e + f * bmD.Width] = clock_color.ToArgb();
image.UnlockBits(bmD);
radar_image.UnlockBits(bmD2);
catch
try
image.UnlockBits(bmD);
catch
try
radar_image.UnlockBits(bmD2);
catch
int c;
for (c = 0; c < localImages.Length; c++)
localImages[c] = new Bitmap(image);
Bitmap new_image = new Bitmap(Properties.Resources.radar_without_clouds);
Bitmap new_image1 = new Bitmap(Properties.Resources.radar_without_clouds);
Bitmap localbmptest = black_and_white(new_image, radar_image);
Image image1 = black_and_white(new_image, radar_image);
image1.Save(@"c:\temp\testclouds666.jpg");
Bitmap clouds = new Bitmap(image1);
int x;
int y;
int a;
int b;
int d = 0;
Bitmap redImage;
redImage = new Bitmap(512, 512);
using (Graphics g = Graphics.FromImage(redImage))
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
g.Clear(Color.Red);
BitmapData bmData = null;
BitmapData bmData2 = null;
BitmapData bmDataArray = null;
try
bmData = clouds.LockBits(new Rectangle(0, 0, clouds.Width, clouds.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
bmData2 = radar_image.LockBits(new Rectangle(0, 0, radar_image.Width, radar_image.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
IntPtr scan0 = bmData.Scan0;
IntPtr scan02 = bmData2.Scan0;
unsafe
int* p = (int*)scan0.ToPointer();
int* p2 = (int*)scan02.ToPointer();
double h, mm;
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bmDataArray = localImages[d].LockBits(new Rectangle(0, 0, localImages[d].Width, localImages[d].Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
IntPtr scan0Array = bmDataArray.Scan0;
int* pArray = (int*)scan0Array.ToPointer();
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for (b = 0; b < new_image.Height; b++)
Color color1 = Color.FromArgb(p[a + b * bmData.Width]);
Color color2 = Color.FromArgb(p2[a + b * bmData2.Width]);
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mm = RadarAnalysis.Hue2MMPerHour(h);
if (mm >= treshhold_array[14 - d])
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clouds.UnlockBits(bmData);
radar_image.UnlockBits(bmData2);
catch (Exception error)
try
clouds.UnlockBits(bmData);
catch
try
radar_image.UnlockBits(bmData2);
catch
try
localImages[d].UnlockBits(bmDataArray);
catch
Logger.Write("Error Exception ==> " + error);
MessageBox.Show("Error Exception ==> " + error);
return localImages;
In the end i'm getting 15 Bitmaps in localImages.
localImages is Bitmap[]
The method get a Bitmap and the Bitmap pixel format is: Format8bppIndexed
I want that in the end the 15 Bitmaps in localImages will be also pixel format of Format8bppIndexed.
The problem is that if i change everywhere in the method from: PixelFormat.Format32bppArgb to PixelFormat.Format8bppIndexed
I'm getting exception on the line:
pArray[a + b * bmDataArray.Width] = color2.ToArgb();
Attempted to read or write protected memory. This is often an indication that other memory is corrupt
System.AccessViolationException was unhandled
HResult=-2147467261
Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source=My Weather Station
StackTrace:
at mws.ImagesComparison.get_images_with_clouds(Bitmap radar_image) in d:\C-Sharp\Download File\Downloading-File-Project-Version-012\Downloading File\ImagesComparison.cs:line 469
at mws.ScanningClouds.backgroundWorker1_DoWork(Object sender, DoWorkEventArgs e) in d:\C-Sharp\Download File\Downloading-File-Project-Version-012\Downloading File\ScanningClouds.cs:line 695
at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)
at System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.ThreadPoolCallBack(Object o)
at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
InnerException:
Line 469 is: pArray[a + b * bmDataArray.Width] = color2.ToArgb();

Thorsten Hi,
Too complicated for me i will try to look on it.
Also if you will have time later maybe you could look at it too ?
For now what i tried was to get the returned 15 new Bitmaps to a local array:
bitmaps = ImagesComparison.get_images_with_clouds(b1);
for (int i = 0; i < bitmaps.Length; i++)
ConvertTo1or8Bit.ColorToGrayscale(bitmaps[i]);
break;
Then make a convertion with a new class trying to convert the Bitmaps to 8 bit in the memory without saving them first to the hard disk. This is the new class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
namespace mws
class ConvertTo1or8Bit
public ConvertTo1or8Bit()
public static Bitmap ColorToGrayscale(Bitmap bmp)
int w = bmp.Width,
h = bmp.Height,
r, ic, oc, bmpStride, outputStride, bytesPerPixel;
PixelFormat pfIn = bmp.PixelFormat;
ColorPalette palette;
Bitmap output;
BitmapData bmpData, outputData;
//Create the new bitmap
output = new Bitmap(w, h, PixelFormat.Format8bppIndexed);
//Build a grayscale color Palette
palette = output.Palette;
for (int i = 0; i < 256; i++)
Color tmp = Color.FromArgb(255, i, i, i);
palette.Entries[i] = Color.FromArgb(255, i, i, i);
output.Palette = palette;
//No need to convert formats if already in 8 bit
if (pfIn == PixelFormat.Format8bppIndexed)
output = (Bitmap)bmp.Clone();
//Make sure the palette is a grayscale palette and not some other
//8-bit indexed palette
output.Palette = palette;
return output;
//Get the number of bytes per pixel
switch (pfIn)
case PixelFormat.Format24bppRgb: bytesPerPixel = 3; break;
case PixelFormat.Format32bppArgb: bytesPerPixel = 4; break;
case PixelFormat.Format32bppRgb: bytesPerPixel = 4; break;
default: throw new InvalidOperationException("Image format not supported");
//Lock the images
bmpData = bmp.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadOnly,
pfIn);
outputData = output.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.WriteOnly,
PixelFormat.Format8bppIndexed);
bmpStride = bmpData.Stride;
outputStride = outputData.Stride;
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unsafe
byte* bmpPtr = (byte*)bmpData.Scan0.ToPointer(),
outputPtr = (byte*)outputData.Scan0.ToPointer();
if (bytesPerPixel == 3)
//Convert the pixel to it's luminance using the formula:
// L = .299*R + .587*G + .114*B
//Note that ic is the input column and oc is the output column
for (r = 0; r < h; r++)
for (ic = oc = 0; oc < w; ic += 3, ++oc)
outputPtr[r * outputStride + oc] = (byte)(int)
(0.299f * bmpPtr[r * bmpStride + ic] +
0.587f * bmpPtr[r * bmpStride + ic + 1] +
0.114f * bmpPtr[r * bmpStride + ic + 2]);
else //bytesPerPixel == 4
//Convert the pixel to it's luminance using the formula:
// L = alpha * (.299*R + .587*G + .114*B)
//Note that ic is the input column and oc is the output column
for (r = 0; r < h; r++)
for (ic = oc = 0; oc < w; ic += 4, ++oc)
outputPtr[r * outputStride + oc] = (byte)(int)
((bmpPtr[r * bmpStride + ic] / 255.0f) *
(0.299f * bmpPtr[r * bmpStride + ic + 1] +
0.587f * bmpPtr[r * bmpStride + ic + 2] +
0.114f * bmpPtr[r * bmpStride + ic + 3]));
//Unlock the images
bmp.UnlockBits(bmpData);
output.UnlockBits(outputData);
return output;
But they are still 32 bit. So i guess i didn't realy understand yet how to do it.

How can I change the name of the administrator that shows on Home Icon?

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