[OT] $DISPLAY screwing up with EPS when matlab run in background?
From: H. S. (greatexcalibur_at_yahoo.com)
Date: 04/29/05
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To: debian-user@lists.debian.org Date: Fri, 29 Apr 2005 00:49:48 -0400
(I posted this in comp.soft-sys.matlab but got no response, so I am
trying my luck here)
Hi,
(matlab version: (version 6.5.1.199709 (R13) Service Pack 1) )
I am trying to run a matlab function I wrote in the background. The
function plots the color histogram of a given image, opens the plot
window and prints out the figure to an EPS file. When I run the function
from within a matlab session, everything works fine. But when I run it
in background, problem arises in the eps file generated.
I have a bunch of images to make histograms of. So I wrote a shell
script which calls matlab in the background and runs the function over
all the images. However, I do not get a proper EPS file. The resulting
file is just tiny little white square. The output file of the background
session does not report any errors.
Here is the shell script I am using (only one image file is used below,
but I will eventually use a for-do-done statement to go over all the images)
#############################################################
#!/bin/bash -f
# Clear the DISPLAY.
#unset DISPLAY # unset DISPLAY for some shells
# Call MATLAB with the appropriate input and output,
# make it immune to hangups and quits using ''nohup'',
# and run it in the background.
IMG="girl1.png"
MFUNC="colorhistplot('girl1.png')"
nohup matlab -nodisplay -nodesktop -nosplash -r $MFUNC > script.out &
#############################################################
And here is the matlab function that I wrote(The function works for a
color PNG file. Can be called as colorhistplot('imgfile.png')):
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function OutArgs=colorhistplot(ImgFile)
%colorhistplot('Img.ppm') Plot color histogram of the specified image file
%
% Img.ppm Filename of the image Img.ppm. Output is
Img.eps.
%
%
%
%This function plots the color histogram of the specified file. The
output is
%fixed so that the EPS exported can be included in a Word or LaTeX document
%
% Example, call the function in matlab with the following command:
% colorhistplot('myimg.ppm')
%where myimg.ppm is the color image whose histogram is desired. The
output is
%is an EPS file of the same basename as the input image file but with the
%extension ".eps".
%first read the image file data into a matrix
I = imread(ImgFile);
if (size(I, 3) ~= 3)
error('rgbhist:numberOfSamples', 'Input image must be RGB.')
end
nBins = 256;
rHist = imhist(I(:,:,1), nBins);
gHist = imhist(I(:,:,2), nBins);
bHist = imhist(I(:,:,3), nBins);
hFig = figure;
figure(hFig);
subplot(1,3,1); hr = bar(0:255, rHist,'r');
%xlabel('i','FontName','Helvetica','FontSize',9);
set(gca,'FontSize',6);axis tight;legend('Red');legend(gca,'boxoff');
ylabel('n','FontName','Helvetica','FontSize',8);
subplot(1,3,2); hg = bar(0:255, gHist,'g');
%ylabel('n','FontName','Helvetica','FontSize',8);
set(gca,'FontSize',6);axis tight;legend('Green');legend(gca,'boxoff');
xlabel('i','FontName','Helvetica','FontSize',9);set(gca,'FontSize',6);axis
tight
subplot(1,3,3); hb = bar(0:255, bHist,'b');
%xlabel('i','FontName','Helvetica','FontSize',9);
set(gca,'FontSize',6);axis tight;legend('Blue');legend(gca,'boxoff');
%ylabel('n','FontName','Helvetica','FontSize',8);
%before printing the figure to a file, makeup a filename
%first, find the index where the dot and extension (e.g. .png) starts
ExtInd=regexpi(ImgFile,'\.[a-zA-Z][a-zA-Z][a-zA-Z]$');
%get the basename of the file (without the extension)
BaseName=ImgFile(1:ExtInd-1);
%now make the actual output filename (with the .eps extension)
OutFileName=strcat(BaseName,'.eps')
set(gcf,'PaperUnits','centimeters','PaperPosition',[0.5 0.5 18.5
5.5]);
%now print the figure to EPS figure.
print(gcf,'-depsc2','-r600',OutFileName)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Any idea what is going wrong when the shell script is run? Does this
have anything to do with a matlab plot window being open when the print
command is to be given?
thanks,
->HS
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