Hi all,

Is it 96 DPI that the highest image resolution obtained from POV Ray? I was
wondering how to get an image with 300 DPI  which is normally required for
journal paper printing. Thanks for any help.

Best regards
Jingming

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"Jingming" <lon### [at] ymailcom> wrote:
> Hi all,
>
> Is it 96 DPI that the highest image resolution obtained from POV Ray? I was
> wondering how to get an image with 300 DPI  which is normally required for
> journal paper printing. Thanks for any help.
>
> Best regards
> Jingming

Just render at a higher resolution. That's pretty much all it really means.

eg. if you have an 11" screen at 1366x768, that screen has a lower DPI than if
the screen had a resolution of 1920x1080 (ok, technically it's pixels per inch
on a monitor).

Post a reply to this message

On 12/11/2014 12:05 PM, jhu wrote:
> "Jingming" <lon### [at] ymailcom> wrote:
>> Hi all,
>>
>> Is it 96 DPI that the highest image resolution obtained from POV Ray? I was
>> wondering how to get an image with 300 DPI  which is normally required for
>> journal paper printing. Thanks for any help.
>>
>> Best regards
>> Jingming
>
> Just render at a higher resolution. That's pretty much all it really means.
>
> eg. if you have an 11" screen at 1366x768, that screen has a lower DPI than if
> the screen had a resolution of 1920x1080 (ok, technically it's pixels per inch
> on a monitor).
>
>

In other words, at 300dpi a 4inx6in image would be 1200x1800, the actual 
DPI setting would need to be set in another program like GIMP or 
Photoshop, if the publisher requires the DPI to be set in the image for 
proper scaling.

Post a reply to this message

> Hi all,
>
> Is it 96 DPI that the highest image resolution obtained from POV Ray? I was
> wondering how to get an image with 300 DPI  which is normally required for
> journal paper printing. Thanks for any help.
>
> Best regards
> Jingming
>
>

POV-Ray have no "knowlege" of DPI value, it only deal in units and 
pixels. The DPI value contained in any image is realy meaningless.

If you want an image of, say, 6" whide by 3" high, to be printed at 300 
DPI, you take the size and multiply it by 300.
In this case, it gives a 1800 by 900 pixels image.

When printing, you can very easily get away with a much lower 
resolution. There is a thing called interpolation, and another called 
dithering with an option called error diffusion that was available for 
consumer grade printers back in the 90's that can take a 100 DPI image 
and print it at 1400 DPI with NO visible noise, no pixelisation and no 
discernebale image degradation... Professional printers and softwares 
have much more advanced and robust similar features.

I remember a time when photos in news papers where about 10 to 12 DPI...

If the image is about 1m on a side, typical for a poster, then, about 
100 DPI is about "retina" resolution.

Post a reply to this message

"Jingming" <lon### [at] ymailcom> wrote:
> Hi all,
>
> Is it 96 DPI that the highest image resolution obtained from POV Ray? I was
> wondering how to get an image with 300 DPI  which is normally required for
> journal paper printing. Thanks for any help.
>
> Best regards
> Jingming

Thanks a lot for help!

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