Tone EQ allows you to apply different exposure compensations to
different parts of the image.
You can achieve a similar effect by creating several instances of
exposure, e.g. one without a mask, so set overall brightness; one with
+1EV to lift the shadows, with a parametric mask; and one with -1 EV
to tame highlights, again with a parametric mask.
Tone EQ basically does the same: it blurs the image to create a
'mask', and then allows you to specify what exposure compensation to
apply to which masked range. So it's like automatically creating a
mask for -8 EV (dark shadows), -7 EV etc., up to 0 EV (white), and
assigning each of them to another instance of the exposure module.
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