You mean abstract profiles. Assumedly you do not want Lab as output.
Place the abstract or effect profile between source and destination
profile and create a multi profile transform.
e.g. sRGB(image) -> effect(sepia) -> output device(monitor)

kind regards
Kai-Uwe Behrmann

Am 23.06.2010 19:26, schrieb Richard Hughes:
> GCM currently allows users to install LAB profiles like "Sepia" and
> "Grayscale" but doesn't actually do anything useful with them. I'm
> intending to show the user a preview of what the profile would look
> like. To do this, I've got a RGB image that I want to "process" using
> the LAB space ICC profile, and then render a new pixbuf to the screen,
> again in RGB.
>
> What's the best way to achieve this with LCMS? I tried the obvious and
> got the "Output profile is operating on wrong colorspace" message.
>   

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