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[IDV #WAX-506623]: Color bleeds across colored contours unacceptably

Brian,

Yes, I don't think it is a problem with the color scale. This may be a subtle
contouring artifact where the contouring algorithm is drifting into areas in
shouldn't, if you see what I mean. This is something you would never notice
except in these two-tone scenarios. (I would continue experimenting with the
contouring parameters rather than the color table at this point.)

Can you explain to me how you are deriving DTdy? I am curious how other
plotting packages handle these data.

Best,

Unidata IDV Support

> I wonder if it is a matter of having only 6 colors in the table?
> 
> No, I made it more (still half red, half blue) using the + in the color table 
> editor, and changed the range, and the contours are still woozy purplish.
> So it is not some color-interpolation thing I think.
> 
> 
> 
> On Jan 20, 2016, at 6:44 PM, Unidata IDV Support <address@hidden> wrote:
> 
> > Brian,
> >
> > Thinking about this a bit more, I don't believe there is a bug or problem 
> > here.
> >
> > The color table is being displayed in exactly the manner you wish. In
> > particular, where you are seeing "blending" are areas where values in the
> > contour data are actually going back and forth across zero and therefore 
> > are mixed
> > purple. It is not the colors that are blending, it is the data themselves 
> > across
> > the "zero boundary".
> >
> > Another way of looking at this is choosing a two tone black and white color
> > table. The white will fade into the background. You will see grey as the 
> > data
> > approach either side of zero.
> >
> > Do you buy this theory? :-)
> >
> > Best,
> >
> > Unidata IDV Support
> >
> >> Same issue when I import this new table.
> >> Contours are not uniform red or blue, but mixed purple.
> >> Thicker contour line width helps show it.
> >>
> >> [cid:3EC5425C-85EE-4B22-87E4-1F10BC1A1C6C]
> >>
> >>
> >>
> >>
> >>
> >> On Jan 20, 2016, at 3:16 PM, Unidata IDV Support 
> >> <address@hidden<mailto:address@hidden>> wrote:
> >>
> >> Brian,
> >>
> >> It is not that the colors are bleeding, it is your color table that 
> >> appears to
> >> be discreet, but apparently is not. Remove all other displays and you will 
> >> see
> >> what I mean. I am unfortunately having trouble loading your bundle though 
> >> I did
> >> get it to load once where I was able to come to that conclusion.
> >>
> >> Try the attached color table which I believe is actually discreet.
> >>
> >> Best,
> >>
> >> Unidata IDV Support
> >>
> >>
> >>
> >> See how some of the contours are purplish? The color bar is purely 
> >> blue/red .
> >>
> >> Is it a bug, or something we have to live with?
> >> Small .zidv bundle attached along with screenshot.
> >>
> >> Brian
> >>
> >>
> >>
> 
> 
> 
> 


Ticket Details
===================
Ticket ID: WAX-506623
Department: Support IDV
Priority: Normal
Status: Open