Re: why is the edge in raster fill plot so blurred?

Hi Xin,

I'm glad it works for you! The newer graphics subsystem employs
antialiasing techniques in its rendering, which for raster formats, is
usually A Good Thing, but not so much for formats like postscript. In
any case, we've seen several cases, postscript or otherwise, where it
would be useful to turn the antialiasing off; a new resource in an
upcoming release, no doubt.

We've occasionally seen visual artifacts arise out of certain viewers,
which is why I asked; I'm not familiar with PS_View, but it sounds
like its doing exactly what its supposed to and is not an issue.

Thanks by the way for your nice succinct example script!

Rick

On Mon, 4 Feb 2013 21:34:50 -0500
  Xin Xie <xiexinyls@gmail.com> wrote:
> Hi, Rick, with "oldps" it works! Really thank you!
> Have no idea why the new "ps" is worse than "oldps".
> I am using a viewer called "PS_View" that goes with TexLive2012.
> It uses ghostscript to render PS file.
>
> Xin
>
>
> Best,
>
> Xin Xie, PhD Student
> School of Marine and Atmospheric Sciences
> Stony Brook University
> homepage: http://metsci.tk
>
>
> On Mon, Feb 4, 2013 at 11:31 AM, Rick Brownrigg <brownrig@ucar.edu>
>wrote:
>
>> Hi Xin,
>>
>> You might try using "oldps" as a workstation type, rather than "ps".
>> Out
>> of curiosity, what are you using to view the postscript files?
>>
>> Rick
>>
>> On Feb 3, 2013, at 2:39 PM, Xin Xie <xiexinyls@gmail.com> wrote:
>>
>> Hi, I am plotting some "raster filled" 2D plot. After I generate the
>>"ps"
>> file and zoom in and closely look at the edge of the boxes. I found
>>that it
>> is so blurred and not sharp, not reaching the demand of image
>>quality by
>> journals. I wonder if there is a way to have sharp edge. Thanks a
>>lot!
>> I give some sample code to reproduce the blurred edge.
>>
>> Xin
>>
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
>>
>> begin
>>
>> nx = 5
>> ny = 5
>> data = new( (/ny, nx/), float)
>>
>> do i = 0, nx-1
>> do j = 0, ny-1
>> data(j,i) = rand()
>> end do
>> end do
>>
>> wks = gsn_open_wks( "ps", "./test") ;plotdir+"/"+varname)
>>
>> res_ct = True
>>
>> ;set resources for graphics
>> res_ct@cnFillOn = True
>> res_ct@cnLinesOn = False
>> res_ct@cnFillMode = "RasterFill"
>>
>> res_ct@lbOrientation = "vertical"
>>
>> res_ct@gsnSpreadColors = True
>>
>> plot = gsn_csm_contour( wks, data, res_ct)
>> end
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Received on Mon Feb 4 20:44:16 2013