Re: Opacity issues with EPS

Hi Rick,

Thanks for the info - I remember hearing that was the case early in the
6.1.0 process, but wasn't sure if it had been updated in time for the -beta
release. The new PNG driver is of a nice enough quality that using it in
lieu of EPS is very doable for my current work. I'd look forward to an
updated EPS driver as well, but understand if that would have to wait for a
later release. Thanks again!

Kyle
----------------------------------------
Kyle S. Griffin
Department of Atmospheric and Oceanic Sciences
University of Wisconsin - Madison
1225 W Dayton St, Madison, WI 53706
Room 1421 Email: ksgriffin2@wisc.edu

On Wed, Sep 12, 2012 at 1:42 PM, <brownrig@ucar.edu> wrote:

> Hi Kyle,
>
> EPS format and our older PS/PDF workstations do not support opacities.
> They should however not generate a SEGV, and if that's what you are seeing,
> I should look into it. I will also file a feature request ticket for an
> updated EPS driver that can make use of the new color capabilities -- we
> *might* be able to slip that into the formal 6.1.0 release.
>
> Apologies for the trouble...
> Rick
>
>
> On Wed, 12 Sep 2012 13:20:30 -0500
> Kyle Griffin <ksgriffin2@wisc.edu> wrote:
>
>> Hi all,
>>
>> I've recently been working on a script in which I'm attempting to fill
>> plot
>> data overlaid above a couple of contour plots (one plain contours, one
>> stipple-filled) and some polymarkers while also below some other
>> polymarkers and several thousand polylines. However, it seems that the
>> successful completion of this script depends on the cnFillType and one of
>> the opacity levels chosen for the fill, and further the EPS output is
>> sometimes corrupt/unreadable.
>>
>> In order to test which part of the resources/plotting was causing issues,
>> I
>> tried a number of scenarios, mainly changing the cnFillType and what kind
>> of opacity settings were present. All of these test were output to EPS, as
>> direct output to PNG seems to work fine. What I deduced is that RasterFill
>> does not seem to handle any partial opacities when output to an EPS
>> (RasterFill works fine with partial opacities when output to PNG), usually
>> resulting in a seg fault at the 'draw' stage later in the script. CellFill
>> seems to work fine with some opacity, and AreaFill, despite being time
>> consuming with my data, plots things fine with partial opacities but NOT
>> when plotting an item of 0 opacity to an EPS. The 0-level opacity seems to
>> create something that image software ImageMagick and Ghostview can't
>> process, despite the file size generally indicating that all the plotted
>> information is within.
>>
>> For the record, I have been able to work around this with the
>> higher-resolution PNG driver, but it would still be nice to have the
>> complete transparency abilities with EPS as well.
>>
>> Although I'm not providing the complete script for now, I'll include the
>> resources used in this troublesome plot, and highlight the ones that seem
>> to play a role in creating the errors. In case the bolded plain text does
>> not come through, those lines are re-pasted at the top of the text below.
>>
>> If my descriptions have been too vague, I can work up a sample script that
>> will hopefully reproduce the problems. I may also be able to try and share
>> the relevant data and script for those who would like to see it. Thanks,
>>
>>
>> Kyle
>>
>> * **irres@cnFillMode = "AreaFill"*
>>
>> * colors(:,3) = 0.6** colors(0,3) = 0*
>>
>>
>>
>> irres = True
>> irres@gsnDraw = False
>> irres@gsnFrame = False
>> irres@gsnLeftString = " "
>> irres@gsnRightString = " "
>> irres@cnInfoLabelOn = False
>> irres@lbTitleFontHeightF = .009
>> irres@lbLabelFontHeightF = .009* irres@cnFillMode = "AreaFill"* ;
>>
>> otherwise will take forever
>> irres@gsnAddCyclic = False ; data already has cyclic point
>>
>> ;*************************************
>> ; IR contour/fill irresources
>> irres@lbBoxLinesOn = True
>> irres@lbLabelBarOn = False
>> irres@lbLabelStride = 4
>> irres@pmLabelBarHeightF = 0.08
>> irres@pmLabelBarOrthogonalPosF = 0.07
>> irres@cnFillOn = True
>> irres@gsnSpreadColors = True
>> ; irres@gsnSpreadColorStart = 1
>> ; irres@gsnSpreadColorEnd = 32
>> irres@cnLinesOn = False
>> irres@cnLineLabelsOn = False
>> irres@cnLevelSelectionMode = "ManualLevels"
>> irres@cnMinLevelValF = 190.
>> irres@cnMaxLevelValF = 270.
>> irres@cnLevelSpacingF = 2.5
>>
>> colors = spread_colors_rgba("**WhiteBlueGreenYellowRed",0,**252,irres)
>> ; colors = spread_colors_rgba("grayscale_**rgba",0,253,irres)*
>> colors(:,3) = 0.6** colors(0,3) = 0*
>>
>> irres@cnFillColors = colors(::-1,:)
>>
>> ------------------------------**----------
>> Kyle S. Griffin
>> Department of Atmospheric and Oceanic Sciences
>> University of Wisconsin - Madison
>> 1225 W Dayton St, Madison, WI 53706
>> Room 1421 Email: ksgriffin2@wisc.edu
>>
>
>

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Received on Wed Sep 12 13:05:23 2012