[Shotwell] Exporting Images

[Anthony]

I recently installed Shotwell, and I like it a lot. Great job! I would like
to use it as the main part of my photography workflow, but I have a couple
questions first.

The color profile in my camera is set to Adobe RGB, but I shoot in RAW. I'm
assuming the color profile is only applied to the thumbnail in the RAW.

I import all my photos into Shotwell as the first step in my workflow. It is
very fast and allows me to filter my images quite quickly. What I usually do
after filtering the photos is open the good ones in RawStudio and export to
TIFF, and then make all my edits in GIMP. I would love to skip the RawStudio
step and export directly from Shotwell.

What has me a little confused is how Shotwell exports to PNG and JPEG. Does
it apply any color profile by default?

Normally I export from RawStudio to TIFF because it is lossless. I could
export to PNG from Shotwell because I believe this is lossless as well. The
problem for me is that when I open the exported PNG in GIMP, it doesn't ask
me if I want to convert the color profile (like it does with the RawStudio
TIFF), which leads me to believe there isn't one in the PNG. 

Basically, what I want to know is, can I still have a color managed workflow
with the following steps: shooting in RAW (sRGB); using Shotwell to export
to PNG; editing in GIMP (sRGB); and sending it to the photo lab (sRGB)?

Is there a plan to add the ability to export to tiff with an embedded color
profile, and if so, when?

Thank you!
Anthony

P.S. - My current workflow in outlined on my blog -
http://www.thephotographyenthusiast.com/photoblog.jsp?id=6
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