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Re: Sometimes noise and resources about colours

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Op maandag 26 nov 2012 22:00 CET schreef Chris:

>>>> The generated files are posted at:
>>>> http://decebal.nl/postscript/keepYourHead.png
>>>> http://decebal.nl/postscript/keepYourHead2.png
>>>
>>> I don't see any "noise" in those. I do see that that the first one
>>> looks like it is anti-aliased (hence the slight fuzziness around the
>>> glyphs), whilst the second is not. If you want anti-aliased output
>>> direct from Ghostscript, lookup the TextAlphaBits and GraphicsAlphaBits
>>> command line options.
>>
>> I mean the anti-aliasing. And I really see it in both. I do not want
>> anti-aliasing. I'll look into the commands you gave. The option
>> +antialias with convert does not work very well. When converting from
>> the pdf there is already some fuzziness. So I should find a way to
>> prevent it cropping up in the pdf.
>
> I don't see any anti-aliasing effects in the second image 
> (keepYourHead2.png), however much I zoom in. Is it possible you're seeing
> scaling artefacts from the image viewer you are using?

Yep, sorry for the noise. :-(


>>>> By the way, I even see noise in the pdf, but less and only under the
>>>> text:
>>>> http://decebal.nl/postscript/keepYourHead.pdf
>>>
>>> Again, I don't see any noise in that, using evince/poppler, xpdf,
>>> Ghostscript and Acrobat.
>>
>> If you look under the letters, there is a little shadow.
>
> Nope, don't see it. What are you using to view the PDF?

Adobe reader, but when I increased the zoom to 6400% there was
nothing. So adobe put me on the wrong leg I am afraid.


>> I do not see fuzziness at:
>> https://www.facebook.com/photo.php?fbid=445065655531047
>
> That image is definitely anti-aliased. If you zoom in a bit, you can
> clearly see the outline "softening" around the characters. I suspect the 
> effect is less obvious at normal zoom levels because the glyphs are 
> filled with a shading.

So in future I should use shading. :-D

Well, I have some experimenting to do. As if I do not have enough to
do. :-P

Thank you for your patience.

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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Sometimes noise and resources about colours Cecil Westerhof <Cecil@decebal.nl> - 2012-11-25 22:43 +0100
  Re: Sometimes noise and resources about colours Chris <cjl@spamcop.net> - 2012-11-25 22:03 +0000
    Re: Sometimes noise and resources about colours Cecil Westerhof <Cecil@decebal.nl> - 2012-11-25 23:54 +0100
      Re: Sometimes noise and resources about colours Chris <cjl@spamcop.net> - 2012-11-26 09:50 +0000
        Re: Sometimes noise and resources about colours Cecil Westerhof <Cecil@decebal.nl> - 2012-11-26 21:43 +0100
          Re: Sometimes noise and resources about colours Chris <cjl@spamcop.net> - 2012-11-26 21:00 +0000
            Re: Sometimes noise and resources about colours Cecil Westerhof <Cecil@decebal.nl> - 2012-11-26 23:19 +0100
              Re: Sometimes noise and resources about colours Chris <cjl@spamcop.net> - 2012-11-26 22:36 +0000
                Re: Sometimes noise and resources about colours Cecil Westerhof <Cecil@decebal.nl> - 2012-11-27 00:41 +0100
          Re: Sometimes noise and resources about colours Cecil Westerhof <Cecil@decebal.nl> - 2012-11-26 22:15 +0100

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