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How to specify pixel values using where function (any suggestions?) [message #85405]

Wed, 31 July 2013 00:10

Brent Fallarcuna
Messages: 6
Registered: July 2013

Junior Member

I've been using the WHERE function: WHERE(variable name EQ pixel value) and been successful generating array/image with my desired pixel values.
How to use the where function to project specified pixel values like 0,1,2,4,8,16,32,64 and 128?

Thank you.

Brent

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Re: How to specify pixel values using where function (any suggestions?) [message #85406 is a reply to message #85405]

Wed, 31 July 2013 02:35

Heinz Stege
Messages: 189
Registered: January 2003

Senior Member

On Wed, 31 Jul 2013 00:10:54 -0700 (PDT), Brent Fallarcuna wrote:

> I've been using the WHERE function: WHERE(variable name EQ pixel value) and been successful generating array/image with my desired pixel values.
> How to use the where function to project specified pixel values like 0,1,2,4,8,16,32,64 and 128?
>
> Thank you.
>
> Brent
>
>
Do you mean something like this:

filter=bytarr(256)
filter[0,1,2,4,8,16,32,64,128]=1b
result=where(filter[array])

The result is an array of all subscipts to the array elements with the
desired values.

Cheers, Heinz

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