imginfo

(tmp_for_tar/vrml.doc/imginfo.m)

Function Synopsis

[h,w] = imginfo (fn)

Help text

 [h,w] = imginfo (filename) - Get image size from file
  hw   = imginfo (filename)

 filename : string : Name of image file

 h        : 1      : Height of image, in pixels
 w        : 1      : Width  of image, in pixels
    or
 hw=[h,w] : 2      : Height and width of image 

 NOTE : imginfo relies on the 'convert' program.

 Last modified: December 2000

Listing of function file tmp_for_tar/vrml.doc/imginfo.m

## [h,w] = imginfo (filename) - Get image size from file
##  hw   = imginfo (filename)
## 
## filename : string : Name of image file
##
## h        : 1      : Height of image, in pixels
## w        : 1      : Width  of image, in pixels
##    or
## hw=[h,w] : 2      : Height and width of image 
##
## NOTE : imginfo relies on the 'convert' program.

## Author:        Etienne Grossmann  <etienne@isr.ist.utl.pt>
## Last modified: December 2000

function [h,w] = imginfo (fn)

[res,status] = system(sprintf("convert -verbose %s NULL",fn));

if status,
  error (["imginfo : 'convert' exited with status %i ",\
	  "and produced\n%s\n"],\
	 status, res);
end

l = length(res);

i = index(res," ");
if ! i, 
  error ("imginfo : Can't interpret string\n%s\n", res);
end

j = i+index(res(i:l),"x")-1;
k = j+index(res(j:l)," ")-1;

if j-1<=i || k-1<=j, 
  error ("imginfo : Can't interpret string (2)\n%s\n", res);
end

w = str2num(res(i:j-1));
h = str2num(res(j+1:k));

if nargout<2, h = [h,w]; end