Eric:
I have never seen any software which dealt with non uniform DPI 
settings, although that is always a possibility.  And all the displays I 
have ever worked on/with have been the same for both H and V.  ( I am a 
display engineer with over 25 years experience in CRT displays and a bit 
in flat panel).  From what I have seen, the RGB trio in any display is 
set up so that the horizontal pitch is the same as the vertical pitch.  
In a flat panel the R, G and B are 3 times taller than they are wide so 
that when you place R, G and B together they form a square.  I don't 
think that Matplotlib or Alan needs to worry about anything outside 
those boundaries.

Wayne

Eric Firing wrote:
> John Hunter wrote:
>   
>> On Jan 31, 2008 12:54 AM, Eric Firing <[EMAIL PROTECTED]> wrote:
>>
>>     
>>> Screens vary.  The screen on my laptop has about 130 dpi. Desktop flat
>>> panels will usually have a smaller value than that.  For example, an old
>>> "15-inch" flat panel with 1024/768 pixels is actually about 12 inches
>>> wide, so dpi=85.  The mpl default 'figure.dpi' of 80 is low; I doubt
>>>       
>> And it is not unusual to have a different DPI in the horizontal and
>> vertical directions.  In order to support true physical sizes on the
>> screen, we would need to support different dpis in the two directions.
>>     
>
> Does any other software actually do this?  I have never seen anything 
> with more than a single dpi setting.  What is an example of a display 
> with non-square pixels?  And how non-square are they?  I suspect this is 
> not something that Alan really needs to worry about.
>
> Eric
>
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