1bpp png conversion problem

[James Dean]

I save a 1bpp bitmap as a 1bpp png......i save this 1bpp png in a
memorystream.....problem is i want to convert this back to a 1bpp bitmap
but it always saves as a 32bpp bitmap....i need the 1bpp png
format.....if i saved the 1bpp bitmap in a the memory stream as a bitmap
there would be no problem...
Bitmap oneBppBmp = new
Bitmap(pageSizeInPixels.width,pageSizeInPixels.Hei ght,PixelFormat.1bppIn
dexed);
MemoryStream pngStream = new MemoryStream();
oneBppBmp.Save(pngStream,ImageFormat.Png);
Bitmap reconvertBmp = new Bitmap(pngStream);
I also tried
Bitmap reconvertBmp = (Bitmap)Image.FromStream(pngStream);
Both of these return a 32Bpp Bitmap....
If i save as follows:
oneBppBmp.Save(pngStream,ImageFormat.Bmp);
then there is no problem with the conversion but the trouble is i need
this png format.......can anyone help....

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