if ImageEnView1.IEBitmap.HasAlphaChannel then begin
  iBitDepth := 32;
  ImageEnView1.IO.Params.BitsPerSample := 8;
  ImageEnView1.IO.Params.SamplesPerPixel := 4;
end
else
begin
  iBitDepth := ImageEnView1.IEBitmap.BitCount;
  if iBitDepth = 24 then
  begin
    ImageEnView1.IO.Params.BitsPerSample := 8;
    ImageEnView1.IO.Params.SamplesPerPixel := 3;
  end
  else if iBitDepth = 8 then
  begin
    ImageEnView1.IO.Params.BitsPerSample := 8;
    ImageEnView1.IO.Params.SamplesPerPixel := 1;
  end
  else if iBitDepth = 4 then
  begin
    ImageEnView1.IO.Params.BitsPerSample := 4;
    ImageEnView1.IO.Params.SamplesPerPixel := 1;
  end;
end;

case ImageEnView1.PixelFormat of
  ie1g:
    begin
      ImageEnView1.IO.Params.BitsPerSample := 1;
      ImageEnView1.IO.Params.SamplesPerPixel := 1;
    end;
  ie8p, ie8g:
    begin
      ImageEnView1.IO.Params.BitsPerSample := 8;
      ImageEnView1.IO.Params.SamplesPerPixel := 1;
    end;
  ie16g:
    begin
      ImageEnView1.IO.Params.BitsPerSample := 16;
      ImageEnView1.IO.Params.SamplesPerPixel := 1;
    end;
  ie24RGB, ie32RGB, ieCIELab:
    begin
      ImageEnView1.IO.Params.BitsPerSample := 8;
      ImageEnView1.IO.Params.SamplesPerPixel := 3;
    end;
  ie32f:
    begin
      ImageEnView1.IO.Params.BitsPerSample := 32;
      ImageEnView1.IO.Params.SamplesPerPixel := 1;
    end;
  ieCMYK:
    begin
      ImageEnView1.IO.Params.BitsPerSample := 8;
      ImageEnView1.IO.Params.SamplesPerPixel := 4;
    end;
  ie48RGB:
    begin
      ImageEnView1.IO.Params.BitsPerSample := 16;
      ImageEnView1.IO.Params.SamplesPerPixel := 3;
    end;
end;
if ImageEnView1.IEBitmap.HasAlphaChannel then
  ImageEnView1.IO.Params.SamplesPerPixel  := ImageEnView1.IO.Params.SamplesPerPixel  + 1;

quote:

---

It is possible to get the bitdepth of 4-bit if using the default of ImageEnView.LegacyBitmap := true and ImageEnView.IO.NativePixelFormat := false?

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