It sounds like a problem I had once.
If remember correctly, try writing out the dpx linear and convert
colorspace with the appropriate node beforehand.
On 9/26/2011 8:47 PM, Farhad Mohasseb wrote:
This sounds like a cache issue more than anything else....have you
tried emptying the cache and the buffer? Do you still get the same
thing? If you change the viewer lut do you still get it or does it go
away until you go back to the last used lut?
On Sep 26, 2011 11:28 AM, "Anthony Kramer" <[email protected]
<mailto:[email protected]>> wrote:
> Its not that the neg values are being retained by the write node,
its that
> the negative values APPEAR when viewing the write node.
>
> This morning I open up the same comp and the issues were gone for
about an
> hour, and then they came back. Deleted the viewer node, and it went away
> again. I'm pretty sure this is a bug of some sort but unfortunately I
> cant consistently reproduce it at this point. I'll keep you all posted.
>
> -ak
>
>
> On Mon, Sep 26, 2011 at 10:47 AM, Mason <[email protected]
<mailto:[email protected]>> wrote:
>
>> 32 bit Floating Point EXR permits negative values. Sounds like you are
>> getting these values from your comp and EXR is not clipping those
values.
>>
>> -Mason
>>
>>
>> On Sep 26, 2011, at 4:24 PM, Anthony Kramer
<[email protected] <mailto:[email protected]>>
>> wrote:
>>
>> Sorry, yes, I should have mentioned that. When I write out the exr
and read
>> it back, it still has the errors I see when just viewing the write
node.
>>
>> -ak
>>
>> On Sat, Sep 24, 2011 at 4:22 PM, Sean Looper <
<[email protected] <mailto:[email protected]>>
>> [email protected] <mailto:[email protected]>> wrote:
>>
>>> The Write node passthrough does make certain assumptions when your
output
>>> is exr. Try writing the file out and compare the written frames to
your last
>>> node.
>>>
>>> -sean
>>>
>>> Sent from my cellular device
>>>
>>> On Sep 24, 2011, at 2:16 PM, "Anthony Kramer"
<<[email protected] <mailto:[email protected]>>
>>> [email protected] <mailto:[email protected]>> wrote:
>>>
>>> NukeX 6.3v2
>>> Windows 7
>>>
>>> On Sat, Sep 24, 2011 at 2:11 PM, Anthony Kramer
<<[email protected]
<mailto:[email protected]>><[email protected]
<mailto:[email protected]>>
>>> [email protected] <mailto:[email protected]>> wrote:
>>>
>>>> It gets worse..
>>>>
>>>> Seems like it's also calculating a few other key operations in my
comp
>>>> differently when selecting EXR as the output format in a write.
Besides the
>>>> neg values below which seem to be coming from a grade, it also
makes my
>>>> Zblur and LensDistortion look different.
>>>>
>>>> If I disable those 3 nodes, I get no difference between the last
node and
>>>> the write. If I enable ANY ONE of those nodes I get a slight
difference in
>>>> their calculation when viewing the write node only.
>>>>
>>>> Bizarre. Serves me right for working on a Saturday.
>>>>
>>>> -ak
>>>>
>>>>
>>>> On Sat, Sep 24, 2011 at 1:06 PM, Anthony Kramer
<<[email protected]
<mailto:[email protected]>><[email protected]
<mailto:[email protected]>>
>>>> [email protected] <mailto:[email protected]>> wrote:
>>>>
>>>>> So I have a fairly simple comp here and at the end when it goes
to the
>>>>> write node, all of a sudden I get negative values. Take a look
at the screen
>>>>> caps below and let me know if you seen anything like this.
>>>>>
>>>>> If I switch the write node to dpx/Cineon the problem goes away. If I
>>>>> switch to exr/Cineon the problem stays so it seems to be
something with the
>>>>> filetype being exr, not the colorspace.
>>>>>
>>>>> -ak
>>>>>
>>>>> <image.png>
>>>>>
>>>>
>>>>
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