MATLAB - write image into an eps file - image

Question

In MATLAB, how do you write a matrix into an image of EPS format?
It seems imwrite does not support EPS.
Convert is not working on the Linux server I am using:
$ convert exploss_stumps.jpg exploss_stumps.eps
convert: missing an image filename `exploss_stumps.eps' # convert.c/ConvertImageCommand/2838
Why?
I tried gnovice's idea under terminal mode:
figH = figure('visible','off') ;
imshow(img,'border','tight',... %# Display in a figure window without
'InitialMagnification',100); %# a border at full magnification
print(strcat(filepath,'/', dataset,'_feature_',num2str(j), '.eps'),'-depsc2');
close(figH) ;
However I got:
??? Error using ==> imshow at 191
IMSHOW requires Java to run.
Error in ==> study_weaker at 122
imshow(img,'border','tight',... %# Display in a figure window without
191 error(eid,'%s requires Java to run.',upper(mfilename));
How can I fix it?

Answer 1

One possible solution is to plot your image using IMSHOW, then print the entire figure as a .eps using PRINT:
img = imread('peppers.png'); %# A sample image
imshow(img,'Border','tight',... %# Display in a figure window without
'InitialMagnification',100); %# a border at full magnification
print('new_image.eps','-deps'); %# Print the figure as a B&W eps
One drawback to this solution is that if the image is too big to fit on the screen, IMSHOW will shrink it to fit, which will reduce the on-screen resolution of the image. However, you can adjust the final resolution of the saved image using the -r<number> option for the PRINT function. For example, you can print your figure as an Encapsulated Level 2 Color PostScript with a resolution of 300 dpi by doing the following:
print('new_image.eps','-depsc2','-r300');
EDIT: If you are unable to use IMSHOW (either because you don't have the Image Processing Toolbox or because you are using a MATLAB mode that doesn't allow it), here is an alternative way to create and print the figure:
img = imread('peppers.png'); %# A sample image
imagesc(img); %# Plot the image
set(gca,'Units','normalized',... %# Set some axes properties
'Position',[0 0 1 1],...
'Visible','off');
set(gcf,'Units','pixels',... %# Set some figure properties
'Position',[100 100 size(img,2) size(img,1)]);
print(gcf,'new_image.eps','-depsc2','-r300'); %# Print the figure
You can also take a look at this documentation to see how printing works without a display.

Answer 2

It should work using imwrite. You would have to add a colormap for it to work though.
However, ckecking the help pages I see that it is NOT possible to use imwrite to write an EPS file.

Answer 3

Following code may help you to convert png file to eps.
fileName = 'FarmerStats'; % your FILE NAME as string
A = imread(fileName,'png');
set(gcf,'visible','off') %suppress figure
image(A);
axis image % resolution based on image
axis off % avoid printing axis
set(gca,'LooseInset',get(gca,'TightInset')); % removing extra white space in figure
saveas(gcf,fileName,'epsc'); % save as COLOR eps file