Hi Luis,

As a very practical matter, I would not worry about about chkform disappearing. 
 It has been present in PDL since v1.99987 was brought under version control in 
1998.  It's unlikely to go anywhere after 21+ years, so you can safely continue 
using it as you are.  If PDL::IO::Pic gets a major overhaul (unlikely), it will 
be well advertised.

That being said, the only requirement to adding it to the @EXPORT_OK would be a 
small amount of documentation.  If you want to do that and make a pull request, 
please go ahead!

cheers,
Derek

> On Mar 26, 2020, at 1:24 PM, Luis Mochan <[email protected]> wrote:
> 
> I have a program that uses rpic to open image files provided by the user.
> I want to give a diagnostic message if rpic cannot read the file
> without calling rpic and having it fail. The package PDL::IO::Pic
> provides the routine rpiccan to check for a specific type of
> image. However, I would have to find out the kind of image first. I
> found out that PDL::IO::Pic already has a function 'chkform' that
> checks the type of the image according to its magick number and its
> extension. Unfortunately, that routine is not exported. Thus, my use
> of that routine (as PDL::IO::Pic::chkform) is risky, as it could
> disappear in the future. Could it be added to the @EXPORT_OK list,
> although not exported by default?
> 
> Regards,
> Luis
> 
> --
> 
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