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IDL Image Binary Coloring [message #91496]

Tue, 21 July 2015 05:33

Kai Heckel
Messages: 51
Registered: April 2015

Member

Hey there!

I produced an array with 0's and 1's and I would like to visualize that simply by using the "image"-command

I tried to figure it out by looking in the manual but that didn't help....

Is it even possible to do that?

Greetings

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Re: IDL Image Binary Coloring [message #91498 is a reply to message #91496]

Tue, 21 July 2015 06:56

dg86
Messages: 118
Registered: September 2012

Senior Member

On Tuesday, July 21, 2015 at 8:33:16 AM UTC-4, Kai Heckel wrote:
> Hey there!
>
> I produced an array with 0's and 1's and I would like to visualize that simply by using the "image"-command
>
> I tried to figure it out by looking in the manual but that didn't help....
>
> Is it even possible to do that?
>
>
> Greetings

The image() command does not expand its argument's
dynamic range automatically. So 1 looks very similar to 0.

To address this ...

IDL> img = image(bytscl(array))

or

IDL> img = image(255*array)

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Re: IDL Image Binary Coloring [message #91517 is a reply to message #91498]

Thu, 23 July 2015 07:43

Kai Heckel
Messages: 51
Registered: April 2015

Member

Am Dienstag, 21. Juli 2015 15:56:18 UTC+2 schrieb David Grier:
> On Tuesday, July 21, 2015 at 8:33:16 AM UTC-4, Kai Heckel wrote:
>> Hey there!
>>
>> I produced an array with 0's and 1's and I would like to visualize that simply by using the "image"-command
>>
>> I tried to figure it out by looking in the manual but that didn't help....
>>
>> Is it even possible to do that?
>>
>>
>> Greetings
>
> The image() command does not expand its argument's
> dynamic range automatically. So 1 looks very similar to 0.
>
> To address this ...
>
> IDL> img = image(bytscl(array))
>
> or
>
> IDL> img = image(255*array)

Thanks David!

I also found out that it is possible to use the MIN and MAX keyword. This also leads to a binary map.

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