Re: help with metadata

[Avinoam]

Justine Barbier wrote
> Hello,
> I try to use Octave for the first time and I need help with metadata. I
> want to create a new image from an already existing image (format .png). I
> need to keep the metadata of the old image to the new image. My problem is
> that some metadata are missing.
> I use this command with matlab :
> Img_info = imfinfo([path]);
> OtherInfo=Img_info.OtherText;
> C1=char(OtherInfo(1,2));
> C2=char(OtherInfo(2,2));
> C3=char(OtherInfo(3,2));
> 
> C1, C2 ... represent the metadata I need to keep and it contains some
> information like that : 
> <Well>
> <WellPosition Type="System.Int32">
> 1
> </
> WellPosition>
> </Well>
> But with octave, when I use imfinfo, I can't find the value OtherText or
> something equivalent.
> Is it normal ?
> I try to use fileread, I can read the data but I don't how to save it on
> the new image ? With imwrite for example I want to add other parameters
> than this one :
> https://www.gnu.org/software/octave/doc/interpreter/Loading-and-Saving-Images.html
> 
> I would like to have something like that :
> imwrite(Img_new,['C:\Users\u101362\Pictures\ImageTest\Controle\I_test249.png'],'Parameters',C1);
> But when I try this (which works in matlab) I have the following error :
> invalid PARAMETER 'Parameters'. But I can't find something else...
> 
> Thank in advance for your help.
> 
> Justine
> 
> _______________________________________________
> Help-octave mailing list

> Help-octave@

> https://lists.gnu.org/mailman/listinfo/help-octave

It seems that you are using undocumented features of Matlab.
The OtherText field is not documented in imfinfo [1], although the example
in [2] shows this field. 'Parameters' option is not documented in imwrite
[3]. 
Is it possible to read and write the metadata with documented features of
Matlab?

[1] [https://www.mathworks.com/help/matlab/ref/imfinfo.html]
[2]
[https://blogs.mathworks.com/steve/2014/09/10/image-file-information-using-imfinfo]
[3] ]https://www.mathworks.com/help/matlab/ref/imwrite.html




--
View this message in context: 
http://octave.1599824.n4.nabble.com/help-with-metadata-tp4684495p4684538.html
Sent from the Octave - General mailing list archive at Nabble.com.