Dear Ce,
you can use
V0=rmfield(V0,'pinfo')
before callin spm_write_vol
This removes pinfo from V0 structure. When pinfo is not defined,
spm_write_vols calculates the optimum scale value for the image data
type and range.
If pinfo is set to 1, you are forcing that the scale factor being 1.
In data type is integer and your real values are small, you will lose
all the decimals.
Hope this helps
Carles
Ce Mo <[log in to unmask]> ha escrit:
> Dear Bas,
>
> Thank you for your insightful comments. The problem has been solved
> exactly the way you described. ^_^
>
> However, I am quite curious about your suggestion here,
>
> "Also make sure the scaling is not off when using spm_write_vol. In your
> Vo handle, this is implicitely stored as the optimal intensity scaling
> for your previous image, which might not be good for your new data."
>
> I noticed that there is not an explicit parameter for
> that in the spm_write_vol function. So how do I turn on
> the scaling when using spm_write_vol?
>
> Many thanks and best regards,
> Ce
> ----- 原始邮件 -----
> 发件人:S.F.W. Neggers <[log in to unmask]>
> 收件人:[log in to unmask]
> 主题:Re: [SPM] How to save the calculated img and hdr files
> 日期:2011-11-23 18:47:15
>
> what is 'Res'? It should be a string with full path to the image
> (i.e.,something like Res='/home/ce/data/mydata.img'). Then you will find
> your image in that folder.
>
> Without a path I guess your image will end up in your current folder,
> but i am not sure about that.
>
> Also make sure the scaling is not off when using spm_write_vol. In your
> Vo handle, this is implicitely stored as the optimal intensity scaling
> for your previous image, which might not be good for your new data.
>
> Otherwise your code looks good to me.
>
>
> Good luck,
>
> Bas
>
> Op 23-11-11 11:53, Ce Mo schreef:
>>
>> Dear all,
>>
>> I have been trying to write a code to perform some calculation on two
>> beta imgs, but I don't know how to save the result/calculated img.
>>
>> I called the function spm_write_vol as:
>>
>>
>> out = sc.*me; % target
>> Vo = spm_vol(char(Canonical));% For simplicity, apply the input elements
>> Vo.fname = Res; % change name
>> Vo = spm_write_vol(Vo,out); % Write output img
>>
>> where out is the calculated img.
>>
>> After that, Vo was saved in workspace but I could not save the out.img
>> or out.hdr in the current folder or anywhere.
>>
>> Any ideas and comments would be greatly appreciated.
>>
>> Many thanks and best regards,
>>
>> Ce
>>
>
>
> --
> --------------------------------------------------
> Dr. S.F.W. Neggers
> Division of Brain Research
> Rudolf Magnus Institute for Neuroscience
> Utrecht University Medical Center
>
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> : http://www.neuralnavigator.com (CEO)
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