Bitmap conversion

[iyuen]

I'm trying to convert byte array (valid bitmap format) into some bitmaps and
back to byte array again. But when I inspect the content of the array
before and after the conversion they are different. I'm used the following
code to do the conversion. May any of you tell me what's happening?

Thanks,

Here are my code....
internal static Bitmap convertImage(string imageText)

{ imageText = imageText.Replace("\r\n", String.Empty);

Byte[] bitmapData;

bitmapData = Convert.FromBase64String(imageText);

MemoryStream streamBitmap = new MemoryStream(bitmapData);

return new Bitmap(streamBitmap);}

}

internal static string convertBase64Array(Bitmap bmp)

{ MemoryStream bmpStream = new MemoryStream();

bmp.Save(bmpStream, System.Drawing.Imaging.ImageFormat.Bmp);

byte[] bmpArray = new byte[bmpStream.Length];

bmpStream.Read(bmpArray, 0, Convert.ToInt32(bmpStream.Length));

return Convert.ToBase64String(bmpArray);}
--
-----------------------------------------------------------------
Isaac Yuen
CEM
University of Alberta
iy***@ualberta.construction.ca
-----------------------------------------------------------------

| University of Alberta
| Phone: [phone]
| Fax: [phone]

[Vadim Chekan]

iyuen wrote:

I'm trying to convert byte array (valid bitmap format) into some bitmaps and
back to byte array again. But when I inspect the content of the array
before and after the conversion they are different. I'm used the following
code to do the conversion. May any of you tell me what's happening?

Thanks,

Here are my code....

Did you check if the result of conversion is still a valid bmp? If yes,
may be it just has changed some characteristic like number of colors?

Vadim Chekan.

[iyuen]

How would I be able to do that to check if it's valid beside showing it on a
form?
Well...i've used ImageFormat.MemoryBmp instead and it throws me an
exception.....

--
-----------------------------------------------------------------
Isaac Yuen
CEM
University of Alberta
iy***@ualberta.construction.ca
-----------------------------------------------------------------

| University of Alberta
| Phone: [phone]
| Fax: [phone]
"Vadim Chekan" <re*****************@rogers.com> wrote in message
news:3l********************@twister01.bloor.is.net .cable.rogers.com...

iyuen wrote:

I'm trying to convert byte array (valid bitmap format) into some bitmaps and back to byte array again. But when I inspect the content of the array
before and after the conversion they are different. I'm used the following code to do the conversion. May any of you tell me what's happening?

Thanks,

Here are my code....

Did you check if the result of conversion is still a valid bmp? If yes,
may be it just has changed some characteristic like number of colors?

Vadim Chekan.