MMM - Exposición y crítica fotográfica - 2004 - 2022 > Consultas Técnicas (Fotografía)

72 resolucion nativa de las maquinas

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Aitor:
He preguntado esta cuestion en colortheory, una lista de correo propiedad de Dan Margulis. Segun me llegen contestaciones la ire poniendo aqui.
En ingles,

This is utter nonsense, and far too many people (novices and professionals alike!) are confused by PPI and what it actually means.

Despite common usage as such, PPI is *not* a measure of a digital image's resolution. The only true measurement of a digital image's resolution is its pixel dimensions; PPI only comes into play as an abstraction to help the user understand the image resolution *as it relates to the output size*, and if there are no output parameters (as there are not when transferring an image from a camera to Photoshop) then PPI is meaningless.

As an example, let's take an image from a typical digital camera set to 1600 x 1200. This image is 1600 pixels wide by 1200 pixels tall; at 72ppi the image would print 22.222" x 16.666", and at 300ppi the image would print 5.333" x 4; in both cases the image is *exactly* the same resolution (specifically, 1600px x 1200px). And if the output dimensions are not known then defining a PPI (be it 300, 72, 150 or 14,239) is meaningless.

If they are bringing the image into Photoshop at 72ppi and changing it to 300ppi with the resample option turned off then they are doing absolutely *nothing* to the image resolution at all, neither making it better nor worse, and this is clearly evidenced by the pixel dimensions in the top portion of the Image Size dialog, which do not change during this operation.



BRIAN PYLANT
Manager, Electronic Prepress

Félix:
Aunque mi comprensión del inglés deja mucho que desear, diría que va en consonancia con lo que decían TrueColor y Oreixa.

Siempre hago una pregunta: ¿Puedo hacer una impresión con calidad fotográfica con una cámara de 1 Mpx.?

La respuesta es: sí

Porque el número de pixels de los que dispongo serán los mismos a 72 p.p.p. o a 300 p.p.p., el único parámetro que cambia será el TAMAÑO de impresión que, en este caso, no superaría el de un cromo.

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