[argyllcms] Re: "Enhance"

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Wed, 09 Dec 2015 22:05:37 +1100

Ben Goren wrote:


…but some of these are also being used for email and MyFaceTwit and that sort
of thing,
and the response from the artist is, “The pictures look washed out on the

It occurs to me that this is something that might actually lend itself to an
approach rather than just suggesting she play around with the pictures in
iPhoto. The
originals are watercolors…and watercolors have a smaller tonal range than a

Might there be some way of using Argyll to do something along the lines of a
gamut map
to approximately find the black point of the ink and the white point of the
paper and
stretch the tonal range? Something akin to an “auto levels” in Photoshop? I
don’t know
if there’l be a similar desire to stretch saturation; if so, that can wait

Normally you would just render it using relative colorimetric - assuming you
a profile that represents the gamut of the artwork.

This is obviously stepping beyond the normal use of these tools…but it seems
to me that
there’s a good chance that Argyll is going to do a better job at this than

I'm not sure how you would go about it. Argyll is intended for mechanically
media, and something like an artist with a brush and paints doesn't have a
(aka device value) input. So it sounds more like a visual adjustment, or
an abstract profile - i.e. measure black and white and map them to full range,
then you have to decide how you are specifying the rest of the gamut. There
aren't many
tools for creating abstract profiles at the moment.

Graeme Gill.

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