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Re: 16 bit Tiff image [message #58935 is a reply to message #58934]

Wed, 27 February 2008 15:03

Stefano Scardigli
Messages: 7
Registered: February 2008

Junior Member

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)!

Stefano Scardigli

On Wed, 27 Feb 2008 14:01:12 -0700, Jean H wrote:

> Stefano Scardigli wrote:
>> nothing is changed
>>
>> 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",img,/SHORT
>> IDL> print,max(img)
>> 255
>> IDL> help,img
>> IMG BYTE = Array[1000, 1000]
>
> img is a long and you try to save it as an integer... have you tried
>
> write_tiff,"prova.tiff",fix(img),/SHORT
> or
> write_tiff,"prova.tiff",img,/LONG
> ?
>
> Jean

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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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