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 <[email protected]>:
> 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 <[email protected]> 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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