| read/writing tiff files [message #35635] |
Sat, 28 June 2003 03:41 |
alex_panton
Messages: 5
Registered: June 2003
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Junior Member |
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ok, this is probably a really simple question but having decided that
having 500+ images to process I needed to do some idl programming !
What i want to do is really simple - but as with all things and
computers simple rapidly progresses to the impossible :)
Here's what I want to do:
I have a directory on my computer with all my images, - tiff files in,
I want to read them into an array - I can do this bit, apply my
processing steps (having trouble with that!), then write the output as
a tiff or jpg file.
I have managed to do this to a fashion but it writes blank files -
very useful!
my code so far...
stuff = ('f:\ftp_web_root\Recent\hawaii\GOES_9\all')
store = ('d:\goes\hawaii')
cd, stuff
files=file_search('*.tiff', COUNT=numFiles);searches for the tiff
files;
x=0
while(x le numFiles-1) do begin ;while loop so i do every image in the
directory;
cd,stuff
input=read_tiff(files(x)) ;reads the tiff file into array;
dimensions=size(input, /dimensions)
print, dimensions ;prints image dimensions;
;input=(330-(0.5*input)); ;this is the processing i want to apply
though i know its not as simple as that but thats for next week!)
outname=input+'bt' ;output file name;
cd, store
openw,1, outname ;opens a file with outname filename;
write_tiff,input ;writes a tiff file of input array
close,1
free_lun,1
x=x+1 ;loops round to next image;
endwhile
end
When i run this it stops at the openw command with a type conversion
error: Unable to convert given STRING to Byte.
If anyone can give me some advice on what i am doing wrong or where i
can read some helpful tips (i have read most of the online sites
posted here)
Thanks in advance
kind regards
alex
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