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[IDV #CVS-551537]: animated GIF color bar changes

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  • Subject: [IDV #CVS-551537]: animated GIF color bar changes
  • Date: Tue, 22 May 2012 10:24:15 -0600
Hi Don,

Sorry I didn't follow up on this sooner. Did you ever have a chance to check 
this against a visible satellite loop? If not, I can check it out and see about 
making idv.capture.gif.useGlobalTable=true the default.

Sean

> Sean-
> 
> I checked in some code that allows me to "fix" this by setting the property:
> 
> idv.capture.gif.useGlobalTable=true
> 
> The problem is that the exising code uses a different lookup for each
> image in the gif, which is what I suspected.  Setting this property to
> true makes the GIF use the first image in the loop as the global lookup
> table which stops the jittering.  However, I'm not sure what this will
> do if you have a set of images that have drastic color changes (e.g. a
> visible sat loop going from dawn to day where the first image is dark).
> I'll run some tests to see what happens.  Right now, the behavior has
> not changed from before because the property is set to false in
> idv.properties.
> 
> Don
> 
> On 2/1/12 4:28 PM, Unidata IDV Support wrote:
> > Hi Don,
> >
> > I'm currently having fun in the colorbar code right now, so I'll check this 
> > out too.
> >
> > Sean
> >
> >> If you save a movie as an animated GIF from an IDV display that has a
> >> color bar in it, the color bar flickers.  I think this is because the
> >> color scaling on each individual frame is slightly different and the
> >> range that the AnimatedGifEncoder is using doesn't take this into
> >> account.  I don't have time to look into this, but if someone at Unidata
> >> (Sean?) could, that would be great.
> >>
> >> See example at:
> >>
> >> http://motherlode.ucar.edu/repository/entry/show/RAMADDA/IDV+Community+Resources/Examples/Climate+Attribution/Scenario+Comparison?entryid=09daf6ac-793e-4939-bdfd-4ef4b24fd7df
> >>
> >> Don
> >> --
> >> Don Murray
> >> NOAA/ESRL/PSD and CIRES
> >> 303-497-3596
> >> http://www.esrl.noaa.gov/psd/people/don.murray/
> >>
> >>
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: CVS-551537
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> >
> 
> --
> Don Murray
> NOAA/ESRL/PSD and CIRES
> 303-497-3596
> http://www.esrl.noaa.gov/psd/people/don.murray/
> 
> 


Ticket Details
===================
Ticket ID: CVS-551537
Department: Support IDV
Priority: Critical
Status: Open