syntax for curves in script-fu

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Graechan

Post subject: syntax for curves in script-fu

Posted: Fri Sep 23, 2011 9:08 pm (#1)

Gimp Scripts Editor

Joined: Feb 18, 2011
Posts: 1569
Location: Australia

Does anyone know a script where the curves command has been used as Iam having trouble with (curves-explicit) or (curves-spline).
e.g. ;(gimp-curves-spline layer 0 16 (0 0 63 73 95 125 127 31 156 188 191 151 223 227 255 255)) without the ()around the control points wilbur says 19 arguments instead of 4 with the () wilbur says incorect syntax.
Yep iv'e tried everything but no go, Wilbur is being difficult.

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Rod

Post subject: Re: syntax for curves in script-fu

Posted: Fri Sep 23, 2011 9:18 pm (#2)

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Joined: May 16, 2010
Posts: 9027
Location: "Looking for my eraser" =P

Not sure if this is correct syntax but it comes from the urbin acid script here
http://www.aljacom.com/~gimp/Urban_Acid_2.6.scm

Code:

       (define (splineValue)
          (let* ((a (cons-array 10 'byte)))
            (set-pt a 0 0 0)
            (set-pt a 1 44 27)
            (set-pt a 2 99 117)
            (set-pt a 3 195 229)
            (set-pt a 4 255 255)
            a
          )
       )
       (gimp-curves-spline copy-layer VALUE-LUT 10 (splineValue))

       (define (splineRed)
          (let* ((a (cons-array 10 'byte)))
            (set-pt a 0 0 0)
            (set-pt a 1 51 6)
            (set-pt a 2 151 137)
            (set-pt a 3 204 228)
            (set-pt a 4 255 255)
            a
          )
       )
       (gimp-curves-spline copy-layer RED-LUT 10 (splineRed))

       (define (splineGreen)
          (let* ((a (cons-array 10 'byte)))
            (set-pt a 0 0 0)
            (set-pt a 1 38 31)
            (set-pt a 2 125 129)
            (set-pt a 3 197 223)
            (set-pt a 4 255 255)
            a
          )
       )
       (gimp-curves-spline copy-layer GREEN-LUT 10 (splineGreen))

       (define (splineBLue)
          (let* ((a (cons-array 8 'byte)))
            (set-pt a 0 0 0)
            (set-pt a 1 22 33)
            (set-pt a 2 149 126)
            (set-pt a 4 255 255)
            a
          )
       )
       (gimp-curves-spline copy-layer BLUE-LUT 8 (splineRed))

But it is also written like this in another script
http://snipplr.com/view/21978/gimp-scri ... ephotoscm/

Code:

(gimp-curves-spline theDrawable 0 8 #(0 0 55 27 176 197 255 255))

Perhaps it is the addition of the hash mark?

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Rod

Post subject: Re: syntax for curves in script-fu

Posted: Fri Sep 23, 2011 9:28 pm (#3)

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Joined: May 16, 2010
Posts: 9027
Location: "Looking for my eraser" =P

Or perhaps this will help.
http://code.google.com/p/paynekj-gimp-s ... curves.scm

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GnuTux

Post subject: Re: syntax for curves in script-fu

Posted: Fri Sep 23, 2011 9:53 pm (#4)

GimpChat Founder

Joined: May 22, 2008
Posts: 2094
Location: Gimpville

In addition to what Rod posted, from the Script-Fu Procedure Browser..

The 3rd argument specifies the number of integer values in the 4th argument (which is an integer array).

For example, a 4 element integer array: #(int1 int2 int3 int4)

Or you can define and initialize the array, as shown in the first example Rod posted.

The only difference in syntax is that gimp-curves-explicit always uses 256 as the value of the 3rd argument.

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Rod

Post subject: Re: syntax for curves in script-fu

Posted: Fri Sep 23, 2011 10:06 pm (#5)

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Joined: May 16, 2010
Posts: 9027
Location: "Looking for my eraser" =P

Wow
So is value = red,green,blue, and alpha channels combined.
and RGB = just red green and blue without alpha?

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Graechan

Post subject: Re: syntax for curves in script-fu(solved)

Posted: Fri Sep 23, 2011 11:53 pm (#6)

Gimp Scripts Editor

Joined: Feb 18, 2011
Posts: 1569
Location: Australia

Got it with this

(define (splineValue)
(let* (
(cp.1 0 0)
(cp.2 38 31)
(cp.3 125 129)
(cp.4 197 223)
(cp.5 255 255)
(cp.6 255 255)
(cp.7 255 255)
(cp.8 255 255))
(gimp-curves-spline inner-bevel-layer 0 16 (splineValue))
)
)
Thanks to all as getting the right syntax was driving me MAD

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Rod

Post subject: Re: syntax for curves in script-fu

Posted: Sat Sep 24, 2011 12:12 am (#7)

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Joined: May 16, 2010
Posts: 9027
Location: "Looking for my eraser" =P

Cool! so what are you working on now?

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saulgoode

Post subject: Re: syntax for curves in script-fu(solved)

Posted: Sat Sep 24, 2011 1:29 am (#8)

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Joined: Apr 23, 2010
Posts: 822
Location: not from Guildford after all

Graechan wrote:

Got it with this

Code:

   (define (splineValue)
          (let* (
            (cp.1 0 0)
            (cp.2 38 31)
            (cp.3 125 129)
            (cp.4 197 223)
            (cp.5 255 255)
            (cp.6 255 255)
            (cp.7 255 255)
            (cp.8 255 255))
       (gimp-curves-spline inner-bevel-layer 0 16 (splineValue))
          )
       )

Thanks to all as getting the right syntax was driving me MAD

No, what you've presented will not work. You have defined a procedure which calls itself and will loop forever. I think you have misplaced a parenthesis.

The gimp-curves-* procedures expect the last argument to be a Scheme 'vector', which in some other programming languages might be called an 'array'. A 'vector' is very similar to a Scheme 'list' but has some important differences (e.g., you can't take a 'car' or a 'cdr' of a vector and you can't use 'map' or 'apply' on them).

The methods of specifying the gimp-curves vector that have been presented so far in this thread are overly complicated at best, and might not work depending upon the user's setup.

There are two simple ways of creating a 'vector' suitable for use in the gimp-curves-* filters. The first is to use the #(...) form to generate a constant vector.

Code:

(gimp-curves-spline drawable HISTOGRAM-VALUE 4 #(0 255 255 0))
(gimp-curves-explicit drawable 
                      HISTOGRAM-VALUE 
                      256 
                      #(0 0 0 0 0 0 0 0 0 0 10 10 10 10 10 10 10 10 10 10 10 
                        20 20 20 20 20 20 20 20 20 20 30 30 30 30 30 30 30 30 30 
                        40 40 40 40 40 40 40 40 40 40 40 50 50 50 50 50 50 50 50 50 50 
                        60 60 60 60 60 60 60 60 60 70 70 70 70 70 70 70 70 70 70 70 
                        80 80 80 80 80 80 80 80 80 80 90 90 90 90 90 90 90 90 90 
                        100 100 100 100 100 100 100 100 100 100 110 110 110 110 110 110 110 110 110 110 110 
                        120 120 120 120 120 120 120 120 120 130 130 130 130 130 130 130 130 130 130 
                        140 140 140 140 140 140 140 140 140 140 140 150 150 150 150 150 150 150 150 150
                        160 160 160 160 160 160 160 160 160 160 170 170 170 170 170 170 170 170 170 170 170 
                        180 180 180 180 180 180 180 180 180 180 190 190 190 190 190 190 190 190 190 
                        200 200 200 200 200 200 200 200 200 200 200 210 210 210 210 210 210 210 210 210 210 
                        220 220 220 220 220 220 220 220 220 230 230 230 230 230 230 230 230 230 230 230 
                        240 240 240 240 240 240 240 240 240 240 250 250 250 250 250)

But the #(...) form only works for constants; i.e., everything in the curves vector has to be a specific number and not a variable or result of an evaluated function.

If you want to create a calculated curve, or one that is obtained from external data (such as a file), then you need to use the (vector ...) procedure.

Code:

(gimp-curves-spline drawable 
                      HISTOGRAM-VALUE 
                      6 
                      (vector 0 0 gray-point (gamma gray-point) 255 255))
(gimp-curves-explicit drawable 
                      HISTOGRAM-VALUE 
                      256 
                      (vector step-0 step-0 step-0 step-0 step-0 step-0 step-0 step-0 step-0 step-0 step-0 step-0 step-0 
                              step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 
                              step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 step-1 
                              step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 
                              step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 step-2 
                              step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 
                              step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 step-3 
                              step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 
                              step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 step-4 
                              step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 
                              step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 step-5 
                              step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 
                              step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 step-6 
                              step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 
                              step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 step-7 
                              step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 
                              step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 step-8 
                              step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 
                              step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 step-9 
                              step-10 step-10 step-10 step-10 step-10 step-10 step-10 step-10 step-10 step-10 step-10 step-10 
                              step-10 )

These two forms of #(...) and (vector ...) are quite similar to their corresponding operations with lists: '(...) and (list ...)

Of course, you can generate your vector of points using an algorithmic procedure, just make sure your final result is vector and that you pass the number of points in the vector to the gimp-curves-* procedure.

Code:

(let* ((curve (generate-some-kind-of-curve 0 255 256 2.2 ))
       (number-of-points (vector-length curve)) )
  (gimp-curves-explicit drawable 
                        HISTOGRAM-VALUE 
                        number-of-points
                        curve ))

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Last edited by saulgoode on Sat Sep 24, 2011 1:47 am, edited 2 times in total.

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mahvin

Post subject: Re: syntax for curves in script-fu

Posted: Sat Sep 24, 2011 1:38 am (#9)

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Joined: Oct 06, 2010
Posts: 2688

Code:

(gimp-curves-spline drawable 
                      HISTOGRAM-VALUE 
                      6 
                      (vector 0 0 gray-point (gamma gray-point) 255 255))

What does the 6 represent in this procedure?

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saulgoode

Post subject: Re: syntax for curves in script-fu

Posted: Sat Sep 24, 2011 1:46 am (#10)

GimpChat Member

Joined: Apr 23, 2010
Posts: 822
Location: not from Guildford after all

mahvin wrote:

Code:

(gimp-curves-spline drawable 
                      HISTOGRAM-VALUE 
                      6 
                      (vector 0 0 gray-point (gamma gray-point) 255 255))

What does the 6 represent in this procedure?

That is the number of elements in the vector.

Code:

(let* ((curve (vector 0 0 gray-point (gamma gray-point) 255 255)))
  (gimp-curves-spline drawable 
                      HISTOGRAM-VALUE 
                      (vector-length curve) 
                      curve ))

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