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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