How do I break up this[solved]

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Graechan

Post subject: How do I break up this[solved]

Posted: Thu Aug 23, 2012 3:25 am (#1)

Gimp Scripts Editor

Joined: Feb 18, 2011
Posts: 1556
Location: Australia

I have this Gimp color '(160 150 140) and I would like to change to Red=160, Green=150 and Blue=140 so that I can use in Gmic Script. Any help would be greatly appreciated.

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Last edited by Graechan on Thu Aug 23, 2012 8:47 pm, edited 1 time in total.

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paynekj

Post subject: Re: How do I break up this

Posted: Thu Aug 23, 2012 4:47 am (#2)

Gimp Scripts Editor

Joined: Jun 22, 2010
Posts: 581
Location: Here and there

Code:

(set! Red (car '(160 150 14)))
(set! Green (cadr '(160 150 14)))
(set! Blue (caddr '(160 150 14)))

See http://www.scheme.com/tspl3/objects.html#g102

Kevin

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Graechan

Post subject: Re: How do I break up this

Posted: Thu Aug 23, 2012 8:46 pm (#3)

Gimp Scripts Editor

Joined: Feb 18, 2011
Posts: 1556
Location: Australia

Thank you Kevin, that worked a treat. it was late last night for me and my brain had frozen (typically) :oops:

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Rod

Post subject: Re: How do I break up this[solved]

Posted: Thu Aug 23, 2012 10:07 pm (#4)

Global Moderator

Joined: May 16, 2010
Posts: 8979
Location: "Looking for my eraser" =P

So Red Green and Blue would be defined as a list?

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GnuTux

Post subject: Re: How do I break up this[solved]

Posted: Fri Aug 24, 2012 5:19 pm (#5)

GimpChat Founder

Joined: May 22, 2008
Posts: 2078
Location: Gimpville

In this case, Red, Green and Blue are variables that take on the values of elements in the list.

You can verify the return values in GIMP's interactive script-fu console.

Code:

> (car '(160 150 14))
160
> (cadr '(160 150 14))
150
> (caddr '(160 150 14))
14

A basic linked list consists of elements which contain data and a pointer (or pointers) to the next element(s) in the list. Surprisingly, wiki has a pretty good good explanation of this data structure.

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