Screenshot: http://i.imgur.com/QmJIiln.png
Above: snapshot from raw develop mode
Below: exported 16-bit png, reimported without changes.

Backstory:

I've been using darktable for a number of years and have recently been
reprocessing some older images to take advantage of the improved noise
reduction options.

A couple of years ago I noticed that older images using the split-toning
effect displayed with incorrect colors (saturation cranked way up). Opening
the darkroom mode and tweaking the split toning settings could get back to
the way it looked previously. I assumed the parameters of the split toning
module had been upgraded in a way that broke backwards compatibility and
didn't worry too much about it, since at the time I had no reason to
reprocess those images. I mention this in case it may be relevant.

Present Issue (current git master)

For reprocessing one of these old images I was looking at a snapshot of a
PNG exported at the time of original processing, so that I could match the
color and tone. So far, so good. Then I exported the image to PNG and
noticed that the result looked very different---much less saturated.

Even with the split toning saturation turned all the way up, I cannot match
the saturation of the original image or of the present RAW. I've tried
every 'rendering intent' with the same result.

I assumed it was some kind of colorspace problem and tried to reproduce the
effect with the colorize and other modules, but I could not.

It seems to be a problem specific to split toning, but it is a subtle
effect, so I may be mistaken.

For the record, I am using color management.

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