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I forgot about that issue. I usually also change Vo.dt(1) as well. The available values are the numbers after the equal signs: uint8=2; int16=4; int32=8; float32=16; float64=64 The best practice would seem to be remove Vo.pinfo and change Vo.dt(1). One word of caution, if you need the values to be unscaled (e.g. you need a value of exactly 1 and you know your value is exactly 1), then you want to make sure you set pinfo(1) to be 1. If you don't care about the scaling, then you let the program set it. A further word of caution, if you have values outside of the range of the datatype, it will be truncated. For example, if dt(1)=2 and pinfo(1)=1, then a value of 300 will be converted to a value of 255 or 256 -- this would be bad. Best Regards, Donald McLaren ================= D.G. McLaren, Ph.D. Postdoctoral Research Fellow, GRECC, Bedford VA Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School Office: (773) 406-2464 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406-2464 or email. On Thu, Nov 24, 2011 at 7:08 AM, CARLES M. FALCON FALCON <[log in to unmask]>wrote: > 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. 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