| Re: 3D images [message #39848 is a reply to message #39844] |
Sat, 19 June 2004 23:54  |
jnettle1
Messages: 27
Registered: January 2001
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Junior Member |
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Al,
The problem seems to be the way you're making the tif files in
Photoshop. Photoshop has lots of optional items you can put in tif
files (including, i think, preserving Photoshop layers now). I'm not
surprised at all that IDL is having problems reading them. I'd go
back to Photoshop and try to make the simplest file you can
make....flatten the image before you save it, make sure it's not
compressed, etc. Also, note that your code is going to bomb unless
you have Photoshop save grayscale files instead of RGB mode files.
The read_tiff routine will assign a [3,m,n] array to the variable
image that you then try to assign to a single band in the variable
volume. (I'm sure you know this but you also have to be saving 8-bit
tif files in Photoshop or otherwise not use byte arrays in IDL) You
may also want to use the count keyword to findfile and use that in
setting up the volume (ie, volume = bytarr(1600,1200,count)) and in
the loop that reads the tiffs (for j = 0, count-1 etc). Anyway, i did
what you said you did....made a tif file in photoshop, made copies,
and then ran your code (modified as i suggested above) and it worked
fine, though i didn't bother sorting the images since they were all
the same in my rough little experiment. Good luck.
Jeff
siliconcube@yahoo.com (Aleks) wrote in message news:<79140897.0406181249.6e0342b5@posting.google.com>...
> Hello,
> this board has been very helpful and I was wondering if anyone could
> help me with the following.
> I'm trying to construct a cylinder. I made a circle in photoshop and
> made 10 copies of the file just renaming it. (example circle_01.tiff,
> ...._02.tiff etc)
>
> this is the code I have (which is barely modified code from Dr.
> Fannings website) and with the following code i was hoping to get an
> isosurface of a cylinder and this is the error that I get before I
> make past the last line:
> % READ_TIFF: Not a TIFF file, bad magic number 19778 (0x4d42)
> % Execution halted at: $MAIN$
> The images are TIFF Files, I checked them from properties tab in
> windows.
> when I run query_tiff command I get the following error
> IDL> ok = query_tiff('test_01.tif', info)
> % Loaded DLM: TIFF.
> IDL> print, info.dimensions
> % Expression must be a structure in this context: INFO.
> % Execution halted at: $MAIN$
>
>
> files=findfile('*.tif')
> index=bsort(files, sortedfiles)
> volume=bytarr(1600,1200,80)
> for j=0,9 do begin
> image=read_tiff(sortedfiles[j])
> volume[*,*,j] = image
> endfor
>
> Thank you
> Al
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