set the quality of GIF

x = 0:0.1:10;

y = sin(x);

fig = figure;

lines = animatedline('Color', 'red');

xlim([0 10]); ylim([-1 1]);

frames(100) = struct('cdata', [], 'colormap', []);

filename = 'filename.gif';

for i = 1:100

addpoints(lines, x(i), y(i));

drawnow;

frames(i) = getframe(fig);

[A, map] = rgb2ind(frame2im(frames(i)), 256);

if i == 1

imwrite(A, map, filename, 'gif', 'DelayTime', 1/30)

else

imwrite(A, map, filename, 'gif', 'DelayTime', 1/30, 'WriteMode', 'append');

end

end

How to change the quality of this GIF. Since the capacity is large, I want to reduce the capacity.

Answer 1

[DGM]

GIF has no "quality" parameter. For the most part, you have three choices:

1. Make the geometry smaller.
2. Make the color table shorter.
3. Use frame optimization.

Options 1 and 2 should be pretty obvious. Either use imresize() or specify a shorter CT when calling rgb2ind().

Option 3 isn't really practical within the scope of MATLAB and imwrite(). Write the image and use some external tool (ImageMagick, GIMP, etc) to optimize it.

[高祥 袁]

thank you, I'll try those ways.