ps to gif

If you have gs (ghostscript) installed, it produces nice tif images.

gs -q -dBATCH -dNOPROMPT -dNOPAUSE -sDEVICE=tiff24nc -r 150 -
sOutputFile=myfile.tif myfile.ps

The number after "-r" is the DPI resolution of the resulting tif
image. If you need it to be gif, you can
convert the tif to gif in image magic without loss.

Jamie Scott
NOAA/ESRL/PSD
james.d.scott_at_noaa.gov

On Sep 6, 2006, at 10:45 AM, ncl-talk-request_at_ucar.edu wrote:

>
> Message: 1
> Date: Wed, 6 Sep 2006 00:01:08 +0300
> From: ozan mert gokturk <gokturko_at_itu.edu.tr>
> Subject: ps to gif?
> To: ncl-talk_at_ucar.edu
> Message-ID: <20060906000108.c1vfmkair0uosocc_at_webmail.itu.edu.tr>
> Content-Type: text/plain; charset=ISO-8859-9
>
> Hi Everybody,
>
> This question is not directly related to NCL, but I hope you have
> an answer.
>
> When converting ps files to gif by imagemagick's convert command,
> there is a
> considerable reduction in the color contrast of the images
> (compared to pdf).
> Convert has a -contrast option which is said to be enhancing the
> contrast, but
> I could not see any effect.
>
> Do you know any better way for this process, which will not
> decrease the color
> contrast? (I am running Mac Os X, by the way)
>
> Thank you
>
> --Ozan
>
>
>
>
> Message: 2
> Date: Wed, 6 Sep 2006 09:21:15 +0900
> From: Takeshi Enomoto <eno_at_jamstec.go.jp>
> Subject: Re: ps to gif?
> To: ncl-talk_at_ucar.edu
> Message-ID: <D36CDC54-55A0-44A0-8CE1-411EF525C16D_at_jamstec.go.jp>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> I am not an ImageMagick expert so I expect someone to correct my
> guess.
>
> The number of colours are reduced to 256.
> Chosen colours are not what you expect.
>
> Here are a few things you could try:
>
> 1. PNG
> Should it be GIF? PNG is a good alternative.
> By default, the number of colours does not seem to be reduced.
> To limit the number of colours and make a small file,
> use -colors <the number of colours> option.
>
> 2. Colour profile
> You can specify a colour profile with -profile option.
> Colour profiles are found in
> /Library/Application Support/Adobe/Color/Profiles/Recommended
> if you install any of Adobe apps, for example.
>
> I imagine that a profile is specified in a PDF file
> so that convert can use this information when choosing 256 colours.
> This is completely a guess.
>
> 3. NCGM
> I have not yet used this format but a ncgm converter is provided with
> ncl.
>
> It would be nice if ncl support one of rastered graphic files in the
> future.
> I use ps when I need to draw a large plot.
> PDF files created by ncl is sometimes huge.
> Perhaps no compression is used.
> PS files are also large but more stable and can be compressed well
> with gzip.
> Otherwise I use PDF most and covert to to other format as necessary.
>
> Good luck.
>
> Takeshi.
>
>

_______________________________________________
ncl-talk mailing list
ncl-talk_at_ucar.edu
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Wed Sep 06 2006 - 10:57:32 MDT