Re: animations using image magick

From: Jon Meyer <jonathan.meyer_at_nyahnyahspammersnyahnyah>
Date: Wed Jul 16 2014 - 14:23:29 MDT

Thanks Adam, I've spent the last day google-sluething on why this was
happening and hadn't found any good hints so I was hoping an NCL user would
have a clue (and you quickly did!).

I guess if I would have followed the first animation example, which creates
a single .ps file for each frame, I would have saved myself the headache,
but I opted for the less cluttered directory and followed the second
example which produces and converts the single .ps file.

Thanks for the solution, I'll embed the convert command between the psplit
and a 'rm pict*.ps' call to delete the 'intermediate" .ps files and have
the best of both worlds.

Jon


On Wed, Jul 16, 2014 at 1:57 PM, Adam Phillips <asphilli@ucar.edu> wrote:

> Hi Jon,
> (To be clear, Image Magick is not supported by the NCL group, although I
> do believe it to be heavily used by NCL users.)
>
> I don't see anything amiss with your NCL script. I was able to get the
> animation to stop jumping around though by separating the .ps file input 3
> ps files (by using "psplit WindsClimo.ps") and then issuing the convert
> command.
>
> Hope that helps..
> Adam
>
>
>
>
> On Wed, Jul 16, 2014 at 1:39 PM, Jon Meyer <
> jonathan.meyer@aggiemail.usu.edu> wrote:
>
>> Hi,
>>
>> I am using NCL to create .ps files with multiple pages that are converted
>> to .gif files using a call to image magick from NCL.
>>
>> I am following this example:
>> http://www.ncl.ucar.edu/Applications/Scripts/animate_2.ncl
>>
>> While the .ps files all appear normal and acceptable, the .gif frames are
>> not aligned appropriately after the first frame is plotted. I have tried
>> using the -dispose flag to clear previous frames, but the issue persists.
>>
>> Attached is a copy of the original .ps file, and the converted .gif file
>> to demonstrate the issue.
>>
>> Thanks,
>> Jon
>>
>> Below is the pertinent code snippet:
>>
>>
>> ;::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>> ;Begin plotting
>>
>> ;::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>>
>> fig_name = "WindsClimo"
>> wks = gsn_open_wks("ps", "Animations/"+fig_name)
>> gsn_define_colormap(wks, "WhiteBlueGreenYellowRed")
>>
>> ; =================================================================
>> ; ASSIGN PLOT RESOURCES
>> ; =================================================================
>>
>> res = True
>> ;use desired resources set below
>> ; res@gsnMaximize = True
>> res@gsnSpreadColors = True
>> ; res@gsnFrame = False
>> ; res@gsnDraw = False
>> res@gsnRightString = " "
>> res@gsnLeftString = " "
>> res@gsnStringFontHeightF = 0.02
>>
>> res@mpFillOn = False
>> res@mpLimitMode = "Corners"
>> res@mpUSStateLineColor = "black"
>> res@mpOutlineBoundarySets = "GeophysicalAndUSStates"
>> res@mpProjection = "Mercator"
>> res@mpLeftCornerLatF = lat(0,0)
>> res@mpLeftCornerLonF = lon(0,0)
>> res@mpRightCornerLatF = lat(n_lat-1,n_lon-1)
>> res@mpRightCornerLonF = lon(n_lat-1,n_lon-1)
>>
>> res@pmTickMarkDisplayMode = "Always" ; Turn on
>> map tickmarks.
>>
>> res@vcRefLengthF = 0.08
>> res@vcGlyphStyle = "CurlyVector"
>> res@vcMinDistanceF = 0.04
>> res@vcRefAnnoBackgroundColor = "grey"
>> res@vcRefAnnoFontHeightF = 0.02
>> res@vcRefAnnoOrthogonalPosF = -0.20
>> res@vcRefAnnoParallelPosF = .93
>>
>> ; =================================================================
>> ; CREATE THE PLOTS
>> ; =================================================================
>>
>> plot = gsn_csm_vector_map(wks,U_climo(0,0,0,:,:),V_climo(0,0,0,:,:),res)
>> plot = gsn_csm_vector_map(wks,U_climo(1,0,0,:,:),V_climo(1,0,0,:,:),res)
>> plot = gsn_csm_vector_map(wks,U_climo(2,0,0,:,:),V_climo(2,0,0,:,:),res)
>>
>> ; =================================================================
>> ; CONVERT PS TO GIF ANIMATION
>> ; =================================================================
>>
>> delete(wks) ; Make sure PS file is closed
>> system("rm Animations/"+fig_name+".gif")
>> cmd = "convert -delay 125 Animations/"+fig_name+ ".ps Animations/"
>> +fig_name+".gif"
>> system(cmd)
>>
>>
>>
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>>
>
>
> --
> Adam Phillips
> Associate Scientist, Climate and Global Dynamics Division, NCAR
> www.cgd.ucar.edu/staff/asphilli/ 303-497-1726
>
> <http://www.cgd.ucar.edu/staff/asphilli>
>

Received on Wed Jul 16 08:23:35 2014

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