I found the solution. You have to save after every frame add. Below is the corrected code.
The image used was irrelevant. This was happening for any multi-page tiff.
ParsePageNumbers is posted below. It's a way to take a printer type of formatted number string and create an innumerable integer list. In full disclosure I found the ParsePageNumbers on the internet, don't recall where.
public void GetTiffPages(string origin, string pages)
{
TiffImage destImage = null;
TiffOptions tiffOptions = new TiffOptions(TiffExpectedFormat.TiffCcittFax4)
{
ResolutionSettings = new ResolutionSetting(200, 200),
Photometric = TiffPhotometrics.MinIsWhite
};
//Create an instance of TiffImage and load the copied destination image
using (var image = (TiffImage)Aspose.Imaging.Image.Load(origin))
{
//Create an instance of int to keep track of frames in TiffImage
int pageCount = image.Frames.Length;
var pageList = ParsePageNumbers(pages, 0, pageCount);
foreach (var pg in pageList)
{
//if any of the page numbers are greater than the available frames
if (pg >= pageCount)
{
break;
}
TiffFrame tiffFrame = image.Frames[pg - 1];
if (destImage == null)
{
destImage = new TiffImage(TiffFrame.CopyFrame(tiffFrame));
}
else
{
destImage.AddFrame(TiffFrame.CopyFrame(tiffFrame));
}
destImage.Save(origin + ".pages", tiffOptions);
}
}
//moves the new selected frames to the original file
if (File.Exists(origin + ".pages"))
{
File.Delete(origin);
File.Move(origin + ".pages", origin);
}
}
private IEnumerable<Int32> ParsePageNumbers(String s, Int32 firstPage, Int32 lastPage)
{
String[] parts = s.Split(' ', ';', ',');
Regex reRange = new Regex(@"^\s*((?<from>\d+)|(?<from>\d+)(?<sep>(-|\.\.))(?<to>\d+)|(?<sep>(-|\.\.))(?<to>\d+)|(?<from>\d+)(?<sep>(-|\.\.)))\s*$");
foreach (String part in parts)
{
Match maRange = reRange.Match(part);
if (maRange.Success)
{
Group gFrom = maRange.Groups["from"];
Group gTo = maRange.Groups["to"];
Group gSep = maRange.Groups["sep"];
if (gSep.Success)
{
Int32 from = firstPage;
Int32 to = lastPage;
if (gFrom.Success)
from = Int32.Parse(gFrom.Value);
if (gTo.Success)
to = Int32.Parse(gTo.Value);
for (Int32 page = from; page <= to; page++)
yield return page;
}
else
yield return Int32.Parse(gFrom.Value);
}
}
}