Hi there, Since ENVI can read it, what does the following ENVI routine says when you run this routine from IDL?: http://www.exelisvis.com/docs/ENVI_FI... Does it show it as a TIFF file? Cheers, Fernando

Hi, Thanks for your response It does not show the TIFF and It returns "ENVI Standard" e P.S. I actually solved the problem with some other work around but it is still unsolved for me that why the files can not be read in IDL.

If the file was created in ENVI and has an associated *.hdr file it isn't a true TIFF file. What I would suggest it renaming the file extension to something more commonly associated with ENVI file formats such as *.dat or *.img. (*.tif extensions should only be used if you are actually using a tiff writing tool). So what you would have then would be for example: 'myndvifile.dat' and 'myndvifile.hdr'. Do not put these files in separate directories. They must always be together for ENVI to open the image file correctly. That said ENVI image files are binary files which is why you can open them with the 'read_binary' function. There is another way to open them. Consider the following pseudocode: filename='C:\whateverdir\myndvifile.dat' ;read_image,filename openr, lun, filename, /get_lun ;set up array to put image data into.(samples, lines) pic=fltarr(512, 512) readu, lun, pic ;How IDL reads the image window, 1, xsize=512, ysize=512, title='IDL Image' ;loadct, 39 tvscl, pic ; Change the way IDL reads the image so it's ;how ENVI would display it window, 2, xsize=512, ysize=512, title='Corrected IDL Image' tvscl,reverse(pic,2)

Hi there, Well, just to point out that if you see the information in the IDL Help for READ_TIFF, you can read the following:\ "Image dimensions may exceed the capacity of IDL integers and even unsigned integers (respective limits being 32,767 and 65,535). Therefore, it is a good idea to know your data or always use long integers." Could this be the issue? Cheers, fernando

Thanks for your response I actually wrote a small code to open my files and re-save them in TIFF format This solved the issue Cheers, e

My data have floating points format. e

Hi there Actually i am new in IDL too.And i have tried to read the tiff files using this tiff program.It supports to read or edit tiff files directly. You can also have a try if you want to do that .It offers a free trial for new users.Hope to help you.