On Jul 16, 2010, at 4:08 PM, Eric Firing wrote:
> On 07/16/2010 09:45 AM, Tony S Yu wrote:
>> I recently noticed that setting the dpi for savefig doesn't work as
>> expected when saving to pdf. Take the following code, for example:
>>
>>>>> import matplotlib.pyplot as plt
>>>>>
>>>>> plt.figure(figsize=(8,6))
>>>>> plt.plot([1,2])
>>>>> plt.savefig('test.png', dpi=100)
>>>>> plt.savefig('test.pdf', dpi=100)
>>
>> The resulting png file is 800 x 600 (as expected), while the pdf file is
>> 576 x 432 [which is (800 x 600) * 72/100]. I found an old thread
>
> No, 576 x 432 is the paper size in points, not dots, so it is 8x6 inches
> as requested. Since the content is all vector-based, there is no notion
> of dots or pixels in test.pdf.
[snip]
>>
>> P.S. maybe enough time has passed that most people have adopted PDF
>> viewers/parsers using PDF >= 1.6, and this hard-coded dpi could be
>> removed? Just a thought.
>
> No; I think the present behavior is correct, regardless of the pdf
> version. It is not really a hard-coded dpi at all, it is a confusing
> aspect of the way mpl uses variables called "dpi". (But someone who
> knows more about pdf may correct me if necessary.)
>
> Eric
Hmm, that makes sense.
I was just confused by the fact that some programs use points as dots or pixels
when displaying to screen. For example, that's how my presentation software
chooses to display embedded PDFs. As a result, an 8in x 6in PNG shows up as a
different size than an 8in x 6in PDF. (Yes, you can resize, but this screws up
all the font sizes). Anyway, I guess this is more an issue with my presentation
software than anything else.
Thanks for the clarification, Eric.
-Tony
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