[R] Artifacts in pdf() of image() (w/o comments)
kubovy at virginia.edu
Mon Aug 13 19:33:58 CEST 2007
I was trying to learn to remove the artifacts by setting the
parameters of the image so that anti-aliasing wouldn't produce them
(analogous to making sure that the screens of two halftone screen
process images are in register before combining them so as to avoid
Moiré patterns). So, I wasn't complaining; I was looking for
instruction. Since the image was computed with R, it's reasonable for
me to ask R experts to help me out of what I thought was caused by my
ineptitude. (Regarding your question, "If it wasn't a bug, why did it
bother you so much?"---there are many things that bother me that are
Moreover, I'm not opposed to complaining to Apple, once I have been
assured that I'm not reporting a bug where there's none.
On Aug 13, 2007, at 9:56 AM, Duncan Murdoch wrote:
> On 8/13/2007 11:43 AM, Michael Kubovy wrote:
>> But is it a bug? Can a program anti-alias text and line drawings
>> and not bitmaps?
> Anti-aliasing is the removal of artifacts caused by displaying an
> image on a low-resolution bitmapped display. Introducing artifacts
> is a bug.
> If it wasn't a bug, why did it bother you so much? And why do you
> think it's reasonable to complain about it on R-help, but not to
> complain about it to Apple, who are clearly responsible for it?
> Duncan Murdoch
>> On Aug 13, 2007, at 9:30 AM, Duncan Murdoch wrote:
>>> On 8/13/2007 11:07 AM, Michael Kubovy wrote:
>>>> Dear Friends,
>>>> Thanks for your input.
>>>> FYI: Preview doesn't show PDF aliasing in the image I produced
>>>> if I uncheck the "Anti-alias text and line art" box under the
>>>> PDF tab in Preferences. So I'm not yet ready to drop Preview
>>>> from my toolbox.
>>> An alternative to dropping Preview is to report the bug in it to
>>> Apple. Apple has an online bug reporting web page somewhere; I
>>> haven't found them as helpful as R-help, but your mileage may vary.
>>> Duncan Murdoch
>> Professor Michael Kubovy
>> University of Virginia
>> Department of Psychology
>> USPS: P.O.Box 400400 Charlottesville, VA 22904-4400
>> Parcels: Room 102 Gilmer Hall
>> McCormick Road Charlottesville, VA 22903
>> Office: B011 +1-434-982-4729
>> Lab: B019 +1-434-982-4751
>> Fax: +1-434-982-4766
>> WWW: http://www.people.virginia.edu/~mk9y/
Professor Michael Kubovy
University of Virginia
Department of Psychology
USPS: P.O.Box 400400 Charlottesville, VA 22904-4400
Parcels: Room 102 Gilmer Hall
McCormick Road Charlottesville, VA 22903
Office: B011 +1-434-982-4729
Lab: B019 +1-434-982-4751
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