Thread Subject:

Error message with imread and imshow

Hi!

I tried to read and present a picture in matlab. The picture itself was created using adobe illustrator and then I saved it in tif format.

When I tried to use 'imread', the following error message appears:
>> imread(Calculation_1.tif)
??? Attempt to reference field of non-structure array

And when I tried to directly use imshow, the following error message appears:
>> imshow(Calculation_1.tif)
??? Attempt to reference field of non-structure array.

What has gone wrong here?
The picture is quite big, the size is 3617x2329
But, I did tried to cut the picture and re-save it using paint, and still the same error messages appear.

Arie,

You need to specify the filename as a string:
A = imread('Calculation_1.tif');
% OR
filename = 'Calculation_1.tif';
A = imread(filename);

Without the quotation marks, matlab thinks that Calculation_1 is the name of a variable, which could contain the filename (as in the second example above) - but of course the variable Calculation_1 doesn't exist.

In this case, the error message was complicated by the fact that the .tif was present - it made Matlab think that the filename was stored in a data type called a structure, which uses the . notation to group variables together.

Hope this helps

Tom C

"Arie Driga" <a_driga@yahoo.com> wrote in message <hl5nuu$i0k$1@fred.mathworks.com>...
> Hi!
>
> I tried to read and present a picture in matlab. The picture itself was created using adobe illustrator and then I saved it in tif format.
>
> When I tried to use 'imread', the following error message appears:
> >> imread(Calculation_1.tif)
> ??? Attempt to reference field of non-structure array
>
> And when I tried to directly use imshow, the following error message appears:
> >> imshow(Calculation_1.tif)
> ??? Attempt to reference field of non-structure array.
>
> What has gone wrong here?
> The picture is quite big, the size is 3617x2329
> But, I did tried to cut the picture and re-save it using paint, and still the same error messages appear.

"Arie Driga" <a_driga@yahoo.com> wrote in message <hl5nuu$i0k$1@fred.mathworks.com>...
> Hi!
>
> I tried to read and present a picture in matlab. The picture itself was created using adobe illustrator and then I saved it in tif format.
>
> When I tried to use 'imread', the following error message appears:
> >> imread(Calculation_1.tif)
> ??? Attempt to reference field of non-structure array
>
> And when I tried to directly use imshow, the following error message appears:
> >> imshow(Calculation_1.tif)
> ??? Attempt to reference field of non-structure array.
>
> What has gone wrong here?
> The picture is quite big, the size is 3617x2329
> But, I did tried to cut the picture and re-save it using paint, and still the same error messages appear.

Thanks Tom!

It appears there is something wrong which I do not know.
I did try with what you told me, but it say that the file could not be found.
I restarted my matlab, and now it works.
But the problem has been solved now!

The image wasn't in your current folder or your path. In that case
you'd need to supply the full path name of the file.

On Feb 13, 3:10 am, "Arie Driga" <a_dr...@yahoo.com> wrote:
> "Arie Driga" <a_dr...@yahoo.com> wrote in message <hl5nuu$i0...@fred.mathworks.com>...
> > Hi!
>
> > I tried to read and present a picture in matlab. The picture itself was created using adobe illustrator and then I saved it in tif format.
>
> > When I tried to use 'imread', the following error message appears:
> > >> imread(Calculation_1.tif)
> > ??? Attempt to reference field of non-structure array
>
> > And when I tried to directly use imshow, the following error message appears:
> > >> imshow(Calculation_1.tif)
> > ??? Attempt to reference field of non-structure array.
>
> > What has gone wrong here?
> > The picture is quite big, the size is 3617x2329
> > But, I did tried to cut the picture and re-save it using paint, and still the same error messages appear.
>
> Thanks Tom!
>
> It appears there is something wrong which I do not know.
> I did try with what you told me, but it say that the file could not be found.
> I restarted my matlab, and now it works.
> But the problem has been solved now!

For future reference, please don't double post.
I answered your question in your first posting:
http://www.mathworks.com/matlabcentral/newsreader/view_thread/273631#717341

-Nathan

Nathan <ngreco32@gmail.com> wrote in message <5de2a538-e3f7-4371-8e9f-c7ad5ec09f1d@u15g2000prd.googlegroups.com>...
> On Feb 13, 3:10 am, "Arie Driga" <a_dr...@yahoo.com> wrote:
> > "Arie Driga" <a_dr...@yahoo.com> wrote in message <hl5nuu$i0...@fred.mathworks.com>...
> > > Hi!
> >
> > > I tried to read and present a picture in matlab. The picture itself was created using adobe illustrator and then I saved it in tif format.
> >
> > > When I tried to use 'imread', the following error message appears:
> > > >> imread(Calculation_1.tif)
> > > ??? Attempt to reference field of non-structure array
> >
> > > And when I tried to directly use imshow, the following error message appears:
> > > >> imshow(Calculation_1.tif)
> > > ??? Attempt to reference field of non-structure array.
> >
> > > What has gone wrong here?
> > > The picture is quite big, the size is 3617x2329
> > > But, I did tried to cut the picture and re-save it using paint, and still the same error messages appear.
> >
> > Thanks Tom!
> >
> > It appears there is something wrong which I do not know.
> > I did try with what you told me, but it say that the file could not be found.
> > I restarted my matlab, and now it works.
> > But the problem has been solved now!
>
> For future reference, please don't double post.
> I answered your question in your first posting:
> http://www.mathworks.com/matlabcentral/newsreader/view_thread/273631#717341
>
> -Nathan

Hi Nathan,

I did not realize that I made double post for this topic.
Thanks for reminding me.