how to save spectrogram of signal as image ? i have given my code.

x=train_data(91,:,1); 
N=1000;
fs=250; 
t=(1:N)/fs; 
Fn=fs/2; 
Wp=[8 30]/Fn; % Passband Frequency (Normalised) 
Ws=[7.8 31]/Fn; %Stopband Frequency (Normalised) 
Rp=1; % Passband Ripple (dB) 
Rs=150; % Stopband Ripple (dB) 
[n,Ws]=cheb2ord(Wp,Ws,Rp,Rs); % Filter Order 
[z,p,k]=cheby2(n,Rs,Ws); % Filter Design 
[sosbp,gbp]=zp2sos(z,p,k); 
%Filter Signal 
filtered_signal=filtfilt(sosbp, gbp,x); 
Z1=filtered_signal; 
figure spectrogram(Z1,128,120,128,fs,'yaxis') 
title('SPECTROGRAM of MOTOR IMAGERY EEG SIGNAL CHANNEL C3');
saveas(gcf,'filename.webp'); %Use to display save as image