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Re: 16 bit Tiff image [message #58926 is a reply to message #58925]

Wed, 27 February 2008 23:01

Stefano Scardigli
Messages: 7
Registered: February 2008

Junior Member

On Wed, 27 Feb 2008 16:12:24 -0700, David Fanning wrote:

> Stefano Scardigli writes:
>
>> better, thanks:
>>
>> IDL> img=read_tiff("V13A5.00.tif",/unsigned)
>> IDL> help,img
>> IMG LONG = Array[1000, 1000]
>> IDL> print,max(img)
>> 65535
>> IDL> write_tiff,"prova.tiff",fix(img),/SHORT <---------
>> IDL> help,img
>> IMG LONG = Array[1000, 1000]
>> IDL> print,max(img)
>> 65535
>> IDL> img2=read_tiff("prova.tiff",/unsigned)
>> IDL> help,img2
>> IMG2 LONG = Array[1000, 1000]
>> IDL> print,max(img2)
>> 255
>>
>> and now both img and img2 are LONG, but the reloaded img2 is still shrunk
>> to 255 levels (ie 8 bit)!
>
> I still don't think so. Are you being *very*
> careful with your variables? You might try using
> a .reset after you write the file and before you
> read it again. I think it is not possible to get
> what you are getting. :-)
>
> Cheers,
>
> David

I'm very careful with my variables, and all the "code" I'm using is just
this:

img=read_tiff("V13A5.00.tif",/unsigned)
help,img
print,max(img)
write_tiff,"prova.tiff",fix(img),/LONG
help,img
print,max(img)
img2=read_tiff("prova.tiff",/unsigned)
help,img2
print,max(img2)

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[Message index]

		Re: 16 bit Tiff image By: Andrew Cool on Thu, 28 February 2008 00:09
		Re: 16 bit Tiff image By: Stefano Scardigli on Wed, 27 February 2008 23:01
		Re: 16 bit Tiff image By: Stefano Scardigli on Wed, 27 February 2008 22:52
		Re: 16 bit Tiff image By: Jean H. on Wed, 27 February 2008 15:45
		Re: 16 bit Tiff image By: David Fanning on Wed, 27 February 2008 15:12
		Re: 16 bit Tiff image By: Stefano Scardigli on Wed, 27 February 2008 15:03
		Re: 16 bit Tiff image By: David Fanning on Wed, 27 February 2008 13:26
		Re: 16 bit Tiff image By: Jean H. on Wed, 27 February 2008 13:01
		Re: 16 bit Tiff image By: Stefano Scardigli on Wed, 27 February 2008 12:32
		Re: 16 bit Tiff image By: David Fanning on Wed, 27 February 2008 11:12
		Re: 16 bit Tiff image By: Stefano Scardigli on Thu, 28 February 2008 23:34

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