PanoTools:
Re: PTGui - Eqirectangular Tiff Output - DPI Question
Ian Wood 2005-Mar-31 22:28:20
As a ROUGH guide, 300ppi can hold enough detail that you can view it
from 12" (300mm) and the print will be as detailed as the eye can see,
200ppi will hold enough for viewing from 18" (450mm), 150ppi from 24"
(600mm).
So your 6900 pixel image could be printed 46" (1170mm) @ 150ppi, but
you wouldn't want to look at it from too close...
I hope to add some of this stuff to the wiki next week.
Ian
On 31 Mar 2005, at 18:31, John Houghton wrote:
>
>
> Just divide the pixel dimensions by the ppi resolution setting of the
> file. This gives the nominal print size. Print programs will
> generally print the image at that print size, but many will also
> allow you to print the image at a smaller or larger size. Printing
> it larger will tend to give reduced quality, as the available pixels
> will have to spread over a larger area. There is no maximum size:
> the bigger it gets, the worse it will look. Printing at around 240
> to 300 pixels per inch will give you high quality. The law of
> diminishing returns sets in above that.
>
> John
>
> --- In #removed#, "russellcobley2004"
> <#removed#> wrote:
>>
>> Thanks Joost!
>>
>> I should have checked your site first!
>>
>> However this leads to another question... Assuming my output .tif
>> file from PTGui is 6900x3450 pixels and 93mb, what is the maximum
>> centimetre dimensions I could print it?
>>
>> I am new to printing out panos so I apologise if this is rather
>> simple to others!
>>
>> Is there a formula I could use to calculate the max print size at
>> different DPI/LPI resolutions?
>>
>> Thanks and best regards,
>> Russell
>>
>> --- In #removed#, Joost Nieuwenhuijse <#removed#>
>> wrote:
>>> Hi Russel,
>>>
>>> The resolution does not matter, please see (5.4):
>>> http://www.ptgui.com/support.html#5_4
>>>
>>> Joost
>>>
>>>
>>> russellcobley2004 wrote:
>>>>
>>>> Hi,
>>>>
>>>> I have noted that the single .tif output from PTGui, after
>> running
>>>> through enblend, results in an image with a 72dpi resolution. My
>>>> source
>>>> input images are all 300dpi .tif's. I am interested in printing
>> out
>>>> some of my panos.
>>>>
>>>> Why does PTGui output .tif files at 72dpi? I know that I can
>> change
>>>> the
>>>> resolution in Photoshop but that of course reduces the actual
>> image
>>>> size. Is there a way a retaining the PTGui output .tif's pixel
>>>> dimensions but change the resolution from 72dpi to 300dpi for
>>>> printing.
>>>> Or is my only option to change the resolution in Photoshop and
>> live
>>>> with the reduced image size?
>>>>
>>>> If anyone who prints panos from PTGui/Panotools output who can
>> offer
>>>> some advice, I would be very grateful!
>>>>
>>>> Thanks
>
>
>
>
>
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