Thank's a lot, I fixed it getting the active-layer for the image and
passing it to -is-rgb.

On Wednesday 17 December 2008 15:44:12 saulgo...@flashingtwelve.brickfilms.com 
wrote:
> You have been using TRUE and FALSE correctly. The problem with Pablo's
> script is that he passing the 'image' variable to
> 'gimp-drawable-is-rgb'. Presumably his script does not generate an
> error because he is executing his script on the first image he opened
> thus the imageID is "1" -- which happens to be the drawableID for
> GIMP's selection mask. Therefore, since the selection mask is a
> grayscale drawable, 'gimp-drawable-is-rgb' returns FALSE even though
> his image may be RGB.
>
> To Pablo, if you wish to determine the mode of your image, I would
> recommend using 'gimp-image-base-type' and pass it the imageID. If you
> use 'gimp-drawable-is-foo' then be sure that the drawableID which you
> pass to it is the correct one.
>
> As further background about these booleans, Script-fu's TRUE and FALSE
> values do not correspond to Scheme's #t and #f booleans. TRUE and
> FALSE are integer constants ("1" and "0" respectively). In point of
> fact, FALSE (the integer "0") will be treated as #t (boolean true) by
> any Script-fu testing it directly.
>
> There WAS a change in the transition from SIOD (in GIMP <2.2) to
> TinyScheme (GIMP >2.4), however, the change was that SIOD treated the
> empty list as boolean false; whereas in TinyScheme (and all other R5RS
> Schemes) everything except #f (boolean false) is considered to be #t
> (boolean true).
>
> Quoting Rob Antonishen <rob.antonis...@gmail.com>:
> > Should SF-TOGGLE be evaluated as a boolean or int in a scheme script?
> >
> > I have been using  (if (= inToggle TRUE) (do-true) (do-false)) where
> > inToggle is a toggle (check box) parameter,
> >
> > Because (if inToggle (do-true) (do-false)) always returns as true.
> >
> > -Rob A.
> >
> > On 12/17/08, Pablo Yaggi <pya...@alsurdelsur.com> wrote:
> >> Working with gimp 2.6 this segment of codes
> >>
> >>        (if (= (car (gimp-drawable-is-rgb image)) FALSE)
> >>          (gimp-image-convert-rgb image)
> >>        )
> >>
> >> gives me this error
> >>
> >>
> >>          Error while executing script-fu-mirror-table:
> >>
> >>          Error: Procedure execution of gimp-image-convert-rgb failed on
> >> invalid input arguments: Image 'file:///home/pablo/glam.jpg' (1) is
> >> already of
> >> type 'rgb'
> >>
> >> Bests,
> >> Pablo
> >>
> >>
> >> (Martin told me my font was too small, is it right now ? )
> >
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