[CHANGESET] updated print.m

[Ben Abbott]

On Apr 21, 2009, at 7:11 AM, Ben Abbott wrote:

> On Apr 20, 2009, at 11:36 PM, Shai Ayal wrote:
>
>> On Tue, Apr 21, 2009 at 4:07 AM, Ben Abbott <bpabbott at mac.com> wrote:
>>> I noticed that converting an eps-file to a bitmap does not give  
>>> the same
>>> result as printing a bitmap.
>>
>> This is a because gnuplot's ps terminal does not produce the same
>> output as it's jpeg terminal, it's not a fault of gs. I generally  
>> find
>> gnuplot's ps terminal to be th most complete, so I always use it, and
>> convert to pdf/png/jpeg as necessary.
>
> For me, the ps and eps output have different font sizes. The ps  
> result is correct. I'll do as you suggest and use it.
>
>>>
>>> Consider the example ...
>>>
>>>       figure (1)
>>>       clf
>>>       plot (1:10)
>>>       set (gca, "fontsize", 12)
>>>       xlabel ("my xlabel")
>>>       ylabel ("my ylabel")
>>>       title ("my title")
>>>       print (gcf, "-djpeg", "test.jpeg")
>>>       print (gcf, "-deps", "test.eps")
>>>       system ("gs -r150 -sDEVICE=jpeg -sOutputFile=test_gs.jpeg - 
>>> dEPSCrop
>>> -dBATCH test.eps")
>>>
>>> The quality of the converted jpeg is degraded and the fontsize is  
>>> different.
>>> If the fontsize is increased by 50%, then the proper size is  
>>> obtained (I may
>>> be off by a point or two).
>>
>> I would recommend the following gs command line to convert from eps:
>>
>> sprintf("gs -r%s -q -dBATCH -dEPSCrop -dSAFER -dNOPAUSE
>> -dTextAlphaBits=4 -sDEVICE=%s -sOutputFile=\"%s\" \"%s\"", res , dev,
>> outfile, infile);
>>
>> BTW,  I would not recommend using jpeg for graphs -- jpeg's lossy
>> compression algorithm is really geared towards compressing photos,  
>> and
>> degrades the picture in a very noticeable way for graphs. I would use
>> png which has lossless compression and compresses graphs very well.
>>
>> Shai
>
> Thanks Shai! I'll do as you suggest.
>
> Ben


I've made the switch from ImageMagick's "convert" to Ghostscript. In  
addition, support for Windows printing has been added (I don't have  
access to a box to test this change, so some assistance would be  
helpful), and improved printing on Unix systems. The "help" has been  
modified to reflect the changes.

I'll delay pushing to give time for testing. If I get no feedback in  
the next day or two, I'll push this change.

Ben

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