How to save spectrogram?

Kindly tell me, how I can save the spectrogram without any labels, ticks or surrounding frame area as a JPEG image in my hard drive?

[Rik]

What have you tried?

[Sania Gul]

Method # 2 of

https://www.mathworks.com/matlabcentral/answers/676373-how-to-extract-a-part-of-the-spectrogram

and

saveas(gcf,'filename.png')

Although the above link was for part of spectrogram, but I applied it for the full spectrogram.

But it is saving the x and yaxis along with numbers over them and the frame itself.

[Sania Gul]

I have also tried this, but same results.

https://www.mathworks.com/matlabcentral/answers/418111-how-to-save-spectrogram-of-signal-as-image

Answer 1

[Rik]

You can do the work yourself (as the axes contains a Position property from which you can determine what you need to crop), but the export_fig function from Yair Altman is probably what you need.

It should be able to export a screenshot of only the axes itself.

Otherwise, you could try digging in the properties to see if there is a CData property you could export directly (which would be the raw underlying data).

[Sania Gul]

tnk u sooooooooooooo much. Stay happy :)

[Rik]

You're welcome, glad to be of help.

[Sania Gul]

Sorry for disturbing u again, but my axis are not disappearing even by using your recommended function. From command:

export_fig AA.jpg -native -c[31 52 0 0];

I get

i.e. the top and right borders are successfully cropped, but when I set the bottom and left cropping values lower than 20 and 25 nothing happens, but as soon as they are equal to or above 20 and 25 respectively, i.e.

export_fig AA.jpg -native -c[31 52 20 25];

the stored image becomes

But, this is not what I want. I only want to store an image like the one given below:

Please, help me. I am stuck.

[Rik]

Perhaps disabling the tick marks before exporting will already do the trick.

[Sania Gul]

Its done. So So sO many thanks. Infinite thanks. OOOOF I m in the air.

[Rik]

You're welcome, glad you were able to help yourself ;)