How to clear dots in image

ı worked on this image but couldn`t get rid of the that white dots how can ı do that?

[Ali Edinç]

im=imread('4.tif');
im2=im2bw(im);
figure, imshow(im2);
im3=bwareaopen(im2,60);
figure, imshow(im3);
image(logical(im3));
image(logical(im2));
colormap(gray(2))
im3=bwareaopen(im2,60);
figure, imshow(im3);

after that ı cant get back to colors ,ı am new to matlab so can you help ?

Answer 1

[Akira Agata]

How about the following?

[X,map] = imread('4.png');
X2 = medfilt2(X);
imwrite(X2,map,'output.png');

[Ali Edinç]

Thank you! Also image quality gets worse, can ı do something about that?

[Ali Edinç]

ı try to obtain closest result to original image