Cheers Howard. Still on 6.0v7 for this show but checked out the
rotopaint_mask output. Looks like (in this version anyway) this is
still affected by the alpha and opacity values (which you'd kind of
expect) so the result even with a grade gives you somewhat different
results. The expression works but is kind of broad-strokes. I can see
edges being an issue on other frames.
Many thanks,
Steve
Howard Jones wrote:
You can use the output mask option (6.2 on) to the alpha or other
channel - which gives you an alpha for all paint strokes then grade
that up as necessary I guess or set an expression to a>0?1:0
On 6.1 this only outputs to a rotopaint_mask channel - turn it on and
shuffle/regrade as necessary
howard
------------------------------------------------------------------------
*From:* Stephen Newbold <stephe...@moving-picture.com>
*To:* Nuke user discussion <nuke-users@support.thefoundry.co.uk>
*Sent:* Fri, 25 February, 2011 12:42:11
*Subject:* [Nuke-users] Rotopaint alpha
Hi,
I don't really use RotoPaint for paint that much but a colleague just
had an issue that seemed really complicated to fix and I wanted to
make sure I wasn't missing anything obvious. He had some paint that
he'd done on a frame, using loads of strokes in bg and color mode but
using semi-transparent alpha values AND lowering the opacity. He then
wanted to project this paint and over it on top of a sequence but as
he soon found out, his alpha values for his paint for way too low and
his result was different.
The quick(ish) fix I had was to duplicate his paint, change all the
alpha and opacity values for every stroke to '1' and copy the alpha
result to the other paint before pre-multing. I get the feeling that
this means 1 too many premults but the result was close enough.
Is there an easier way to force rotoPaint to output an full strength
alpha for every stroke? Surely this crops up quite often for people
doing prep work?
Cheers,
Steve
-- Stephen Newbold
Senior Compositor - Film
MPC
127 Wardour Street
Soho, London, W1F 0NL
Main - + 44 (0) 20 7434 3100
www.moving-picture.com
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_______________________________________________
Nuke-users mailing list
Nuke-users@support.thefoundry.co.uk
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--
Stephen Newbold
Senior Compositor - Film
MPC
127 Wardour Street
Soho, London, W1F 0NL
Main - + 44 (0) 20 7434 3100
www.moving-picture.com
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