Thanks Gillaume,
The input image contains a normalized difference vegetation index with
values in the range -1 to +1
Just realized, by reading the terminal output, that Convert is not able to
properly compute the min and max (I get NaNs). that would explain getting a
blank image.... Rescale is able to find the right min and max values but it
still outputs a blank image.
Please see attached the log files.
On Wed, Dec 16, 2015 at 2:22 PM, Guillaume Pasero <[email protected]>
wrote:
> Hi,
>
> What does your input image contain ? Decimal values between 0 and 255 ?
> For the Convert application, "-type none" means no rescaling, pixel
> values are just cast to the output type.
> Could you send the terminal output (for both Convert and Rescale)?
>
> Regards,
> Guillaume
>
> On 12/16/2015 02:05 PM, Raul ZM wrote:
> >
> > Hi there,
> >
> > we are trying to transform a float32 tiff image into a uint8 (so from
> > decimals to the interval 0 to 255).
> > For this we have tested Convert:
> > olbcli_Convert -in file1.tiff -out file2.tif uint8 -type linear (btw,
> > what would be type "none"?)
> >
> > and Rescale:
> > otbcli_Rescale -in file1.tiff -out file2.tif uint8 -outmin 0 -outmax 255
> > (also tried without the last three parameters as these are the default
> > values)
> >
> > in both cases we get blank images or an stripped image that has nothing
> > to do with the original file.
> > Any idea/suggestion of what might be going on?
> >
> > Thanks
> > Raul
> > PS: we are calling the .bat files from DOS
> >
> > --
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otbcli_Rescale -in "D:\NDI1_2.tif" -out "D:\1_2_rescale.tif" -ram 2048 -outmin
0 -outmax 255
2015 Dec 16 16:10:24 : Application.logger (DEBUG) Starting Min/Max
computation
Min/Max computing: 0% [ ]
Min/Max computing: 2% [* ]
Min/Max computing: 4% [** ]
Min/Max computing: 6% [*** ]
Min/Max computing: 8% [**** ]
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(0.5 seconds)
2015 Dec 16 16:10:25 : Application.logger (DEBUG) Min/Max computation done :
min=[-0.988506] max=[0.990909]
Writing D:\1_2_rescale.tif...: 0% [
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otbcli_Convert -in "D:\NDI1_2.tif" -out "D:\1_2.tif" uint8 -type linear
2015 Dec 16 16:06:58 : Application.logger (DEBUG) Shrink factor used to
compute Min/Max: 8
2015 Dec 16 16:06:58 : Application.logger (DEBUG) Shrink starts...
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2015 Dec 16 16:06:59 : Application.logger (DEBUG) Shrink done
2015 Dec 16 16:06:59 : Application.logger (DEBUG) Evaluating input Min/Max...
2015 Dec 16 16:06:59 : Application.logger (DEBUG) Min/Max computation done :
min=[nan] max=[nan]
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