# Tckconvert -image2scanner
**URL:** https://community.mrtrix.org/t/tckconvert-image2scanner/1612
**Category:** Uncategorized
**Created:** [May 4, 2018, 4:09pm UTC](https://community.mrtrix.org/t/tckconvert-image2scanner/1612 "2018-05-04T16:09:22Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Jeongwon\_Jeong](https://community.mrtrix.org/u/Jeongwon_Jeong)
#### Post date: [May 4, 2018, 4:09pm UTC](https://community.mrtrix.org/t/tckconvert-image2scanner/1612/1 "2018-05-04T16:09:22Z")
Hello, I am converting tmp.tck (total count: 138227) into tmp1.tck using the following command,
tckconvert -force -image2scanner mask.nii tmp.tck tmp1.tck. But, the output tmp1.tck has only a half size of input streamlines (69114) as shown below. Any thought on this ??
…
datatype: ‘Float32LE’
count: ‘69114’
total\_count: ‘138227’
data: {1×69114 cell}
---
### Author:  [@jdtournier](https://community.mrtrix.org/u/jdtournier)
#### Post date: [May 4, 2018, 4:42pm UTC](https://community.mrtrix.org/t/tckconvert-image2scanner/1612/2 "2018-05-04T16:42:32Z")
Can I just check: are you sure that the original `tmp.tck` file didn’t also have the same `count` field of 69114? It’s actually pretty rare for these two fields to match – the `total_count` field refers to the total number of streamlines successfully seeded, but many won’t survive the various tests subsequently applied (minimum length, include/exclude, etc.)… It doesn’t refer to the number of streamlines actually in the file itself.
If you can confirm that the `count` field genuinely doesn’t match before and after conversion, then we’ll need to investigate. Also, please try running `tckinfo -count`: this forces an explicit count of the streamlines in the file, rather than merely reporting the value in the header.