On mardi 23 janvier 2024 23:52:38 CET Bruce Williams wrote:
> Are you submitting a digital file, or a physical print?
> If it's a digital file, I'd avoid that competition, because the organisers
> don't even know what they're asking for!
> Let's take a random example:
> A digital file from a 24mp sensor is (roughly speaking) 6000 pixels x 4000
> pixels.
> This file can be said to be 83.3 inches x 55.5 inches at 72 ppi.
> Or it can be referred to as being 20 inches by 13.3 inches at 300 ppi.
> So, unless the organisers have specified a PRINT SIZE @ 72 ppi, they have
> no idea of what they are on about.
>
>
> -- Forwarded message -
> From: Andrew Greig
>
> Hi
> I have recently decided to jump into photographic competition, and one
> of the requirements for submission is to adjust my file to 72 PPI what
> would be the best settings for export please?
>
And even if they require a physical print, I'd hesitate: "normal" printing
resolution is about 300 DPI or higher. 72 DPI is low even for screen display
(standard there is 96 DPI).
As to darktable export settings: go to the export module, and select for "set
size" either "in cm" or "in inch". That will give you the option to set a size
in cm (or inch), and a DPI, and will display the resulting size in pixels.
Note that a file cannot have a resolution (in DPI), it's just a bunch of pixel
data. Until you are displaying or printing, any notion of resolution is
irrelevant. And for a screen, its size in pixels is fixed (and usually known),
so you don't need (or want) the DPI here either.
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