clear;

% create a signal
x = linspace(0, 4*pi, 100).';
y = sin(x);

figure;

% white figure background
set(gcf, 'Color', [1, 1, 1]);

% figure size and aspect ratio
set(gcf, 'Position', [300 300 400 300]);

% plot y
plot(x/pi, y, 'Linewidth', 2, 'Color', [.7 .7 .7]); % light gray color
grid on;
box on;

xlim([-.5 4.5]);
ylim([-1.2 1.2]);

xlabel('$x / \pi$' , 'interpreter', 'latex', 'Fontsize', 16);
ylabel('$\sin(x)$' , 'interpreter', 'latex', 'Fontsize', 16);

% export a bitmap of the figure
print('sine.png','-dpng', '-painters', '-r600');
% This command should be fine, too:
%print('sine.png','-dpng', '-opengl', '-r600');