No matter how you try to complicate it, 6000x3000 is 18 MP, it´s simple
maths.
Using the same car/road example, what you´re trying to do is to say that a
kilometer (same in land or water :^P ) varies in the quantity of meters it
"holds" depending on the pavement or how much a user "enjoys" it (the
"representation").
If I take a 3 MP image from my old Coolpix camera and interpolate to be 1
GP, it IS a 1 GP image; regardless of quality. Even if I decide to make a
solid white it STILL is a 1 GP image.
It´s *simple math*, quality, proyections, aesthetics and what not have
nothing to say in this matter.
Cheers.
On Fri, Oct 22, 2010 at 5:06 PM, Sacha Griffin <
#removed#> wrote:
> I think what you fail to see is that you consider 6000x3000 to BE the image
> when in fact it's a representation of the image instead.. The projection
> if
> you will.
> If you change projections, these numbers "6000x3000" will become a new set
> of numbers based on a nearly arbitrary decision about how are you trying to
> preserve the original detail.
> For example, take your gigpixel image set with 180 fov... and try to output
> your projection to rectilinear while trying to keep every possible
> detail...
> Based on some thoughts about it, you might end up with 1000 gigapixel image
> instead.
>
> Whether or not a gigapixel image is a gigapixel image is more or less up to
> the creator of the image and any attempts to validate it based on the
> dimensions of the final image is silly.
> Or you can simply call it a gigapixel image based on the output dimensions,
> but the actual detail resolution between different "gigapixel" images will
> still be comparing apples to oranges.
> A .5 gigapixel image may be far superior to a 2 gigapixel image in cases.
>
> s
>
> -----Original Message-----
> From: #removed# [mailto:#removed#] On
> Behalf Of Matthew Rogers
> Sent: Friday, October 22, 2010 5:24 AM
> To: #removed#
> Subject: Re: [PanoToolsNG] Re: What's a Gigapixel?
>
> But the projection is irrelevant and YES a 6000 x 3000 images regardless of
> it's projection or content IS 18 megapixels. Stop trying to make issues
> where none exist.
>
> It's the same as a megapixel, these terms are simply units that represent a
> quantity just like a litre, gallon, mile, kilometre etc.
>
> http://en.wiktionary.org/wiki/gigapixel
>
> It's like trying to argue how long a mile is based on the type of car and
> speed I'm driving to cover it.
>
> On 22 Oct 2010, at 09:33, prague wrote:
>
> > in that logic, a 6000x3000 equirect panorama is 18 megapixels.
> >
> > even though the top and bottom row of pixels (that's 18000 pixels) is
> > in reality TWO pixels in a spherhical projection)
> >
> > So sorry matt, everything is really not so simple, even if you would like
> it to be.
> >
> > --- In #removed#, Matthew Rogers <matthew@...> wrote:
> > >
> > > No it simply is not, a 6mp camera like the D70 has images which are
> 3000px x 2000px or 6 million pixels hence 6 megapixels. You can look at it
> anyway you want but a gigapixel image has to be 1,000,000,000 pixels
> regardless of the projection, crop etc. If the final image doesn't have a
> billion pixels then it aint a gigapixel image.
> > >
> > > I do love how panoramic photographers seem to be addicted to making
> things more convoluted and more difficult then necessary.
> > >
> > > Matt
> > >
> > >
> > > On 19 Oct 2010, at 20:39, Christian Bloch wrote:
> > >
> > > > Right.
> > > >
> > > > Elaborating my the chain of thought from last night, we could say
> that
> a panorama that matches the human visual field with 4 times the resolution
> of the human eye, is in fact a Gigapixel panorama.
> > > >
> > > > (200 hFOV x 135 vFOV) x (200 pixels per degree)^2 = 1,080,000,000
> pixels.
> > > >
> > > > Of course, that relies on the fact that Wikipedia is right about the
> numbers....
> > > >
> > > > Blochi
> > > >
> > > > On Oct 19, 2010, at 11:21 AM, Bernhard Vogl wrote:
> > > >
> > > > > I'm also using the term "pixels per degree" to explain people
> > > > > how detailed a panorama actually is. You still can cheat by
> > > > > using another projection but it is very useful to explain the
> > > > > difference between a large and a small FOV image...
> > > > >
> > > > > Bernhard
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> --
>
>
>
>
> ------------------------------------
>
> --
>
>
>
>
--
Isaac Garc?
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JFGI | RTFM
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