14 Jun
2017
14 Jun
'17
1:34 a.m.
On Cineplayer with no color conversion it looks right, with reverse
XYZ looks like... well, a greenish XYZ reversed images.
Also tried the tiff on Davinci. Can't really figure out if Davinci is
compensating the preview when I apply the LUT. Not an expert.
Maybe try to encode a few frames with dom and color conversion active.
Manuel AC
On Tue, Jun 13, 2017 at 7:49 PM, Jim Dummett via DCPomatic
<dcpomatic(a)carlh.net> wrote:
Hi Carsten.
Thanks very much for swift reply. Just tried what you suggested - loaded the
DCP back into DCP-o-matic. The green cast is there too.
The cast is slight - I'm comparing it to a reference Quicktime and might not
notice immediately that the image is wrong if I didn't have something to
compare it to, but it's definitely there. Of course one could wonder if the
Quicktime reference is the one that's actually off, but it looks clearly
like how the grade was meant to be, particularly whites are definitely not
white in the DCP.
The cast is also definitely visible on the clock still I linked to in
previous email.
Any further thoughts on what likely cause is? It's *possible* that the image
sequence I've been given is wrongly coloured, and that's the problem, but
it's from a very reputable post house so more likely I suspect more likely
that the fault is mine :)
Jim
On 13/06/2017 23:04, Carsten Kurz wrote:
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it comes out with a green tinge. I've used colour conversion "none"
setting and this is on DCP-o-matic v2.10.5.
I don't have access to a projector, so am judging the success (or not) of
the conversion using two methods:
1. Viewing in Easy DCP Player demo
2. Converting DCP to ProResHQ Quicktime with ffmeg (ffmpeg -i j2c_...mxf
-c:v prores -profile:v 3 output.mov)
Load the resulting DCP right into DCP-o-matic after creation (yes, that is
possible). Does it look right there? Then you are okay.
Many PC DCP players have options to enable/disable inverse XYZ->RGB for
display. Some demos do not do any conversion. It is quite common that people
turn up on the forum or this list and complain about ‚greenish‘ image. The
typical reason is they are using a player application without the proper
image conversion.
- Carsten