High resolution...through digital interpolation...

Des wrote:
My camera takes photos in normal resolution but claims to be able to take
finer photos at a higher pixel-rate through "digital interpolation".
Surely that's just stretching the image and not worth doing?
Can't I improve the image to the same degree later using filters in Corel
Photopaint?

Is there any real advantage in terms of image quality between an image
that's been digitally interpolated to a higher resolution?
It's no substitute for a higher resolution CCD in the camera is it?

D.


It is marketing, just like 'digital zoom'. Many 'enhanced digital
zooms' do basically the same thing, interpolating to a larger size, then
cropping.
It's mostly smoke and mirrors, but the pictures usually DO look
smoother, just not more detailed.


--
Ron Hunter

Mxsmanic wrote:
Larry writes:


On some cameras the improvement is there but only slight, on others its just
an up-sizing that gives you a bigger picture, but not a better one.


There is never an improvement.


Fuji makes several that "interpolate upward" and on the S7000 there is
USUALLY some improvement ...


There is never any improvement. It's a mathematical impossibility.

There is an 'apparent' improvement, since 'jaggies' are artificially
reduced.

--
Ron Hunter

Mxsmanic wrote:
Larry writes:


On some cameras the improvement is there but only slight, on others its just
an up-sizing that gives you a bigger picture, but not a better one.


There is never an improvement.


Fuji makes several that "interpolate upward" and on the S7000 there is
USUALLY some improvement ...


There is never any improvement. It's a mathematical impossibility.

There is an 'apparent' improvement, since 'jaggies' are artificially
reduced.

--
Ron Hunter

Mxsmanic wrote:
Des writes:


My camera takes photos in normal resolution but claims to be able to take
finer photos at a higher pixel-rate through "digital interpolation".
Surely that's just stretching the image and not worth doing?


Correct.


Can't I improve the image to the same degree later using filters in Corel
Photopaint?


You can't improve an image through any type of manipulation. You will
never have better quality than the image had when originally recorded.
Interpolation is the creation of an optical illusion; it does not
improve real image quality.


Is there any real advantage in terms of image quality between an image
that's been digitally interpolated to a higher resolution?


No.


It's no substitute for a higher resolution CCD in the camera is it?


No, it's not.


Sigh.
Ok, let's start a firestorm here.
IF you have taken a picture at, say 4mp, and the picture has a lot of
sharp lines, some at angles to the horizon, then you CAN get a better
looking picture if you interpolate to a larger size, but ONLY because
the interpolation algorithm is able to insert pictures that are the same
as what would have been captured by a higher resolution sensor. They
aren't 'real', but they end up in the same place as a real one would be,
so the difference is rather more theoretical than practical.

That said, the utility of this kind of interpolation is limited, and
will rarely give you noticeably better results than just processing the
picture with Photoshop.


--
Ron Hunter

Mxsmanic wrote:
Des writes:


My camera takes photos in normal resolution but claims to be able to take
finer photos at a higher pixel-rate through "digital interpolation".
Surely that's just stretching the image and not worth doing?


Correct.


Can't I improve the image to the same degree later using filters in Corel
Photopaint?


You can't improve an image through any type of manipulation. You will
never have better quality than the image had when originally recorded.
Interpolation is the creation of an optical illusion; it does not
improve real image quality.


Is there any real advantage in terms of image quality between an image
that's been digitally interpolated to a higher resolution?


No.


It's no substitute for a higher resolution CCD in the camera is it?


No, it's not.


Sigh.
Ok, let's start a firestorm here.
IF you have taken a picture at, say 4mp, and the picture has a lot of
sharp lines, some at angles to the horizon, then you CAN get a better
looking picture if you interpolate to a larger size, but ONLY because
the interpolation algorithm is able to insert pictures that are the same
as what would have been captured by a higher resolution sensor. They
aren't 'real', but they end up in the same place as a real one would be,
so the difference is rather more theoretical than practical.

That said, the utility of this kind of interpolation is limited, and
will rarely give you noticeably better results than just processing the
picture with Photoshop.


--
Ron Hunter

In article ,
says...
Larry writes:

On some cameras the improvement is there but only slight, on others its just
an up-sizing that gives you a bigger picture, but not a better one.

There is never an improvement.

Fuji makes several that "interpolate upward" and on the S7000 there is
USUALLY some improvement ...

There is never any improvement. It's a mathematical impossibility.




Well its wonderful that you know everything there is to know about a camera
you dont own, havent tried, and dont know **** about.

There is SOMETIMES, an aparent increse in picture detail with the Fuji S7000.
Does it make a 12mp image YES! Does it have 12mp of resolution? NO! Does it
sometimes improve the aparent resolution? YES! Even some reviewers say that
SOMETIMES it works, however, nobody that I've read recommends it, and niether
do I, so whats your problem????? Fuji sells it as a 6mp Camera (Thats what it
says on the box it came in.

Personally, I use it in 6mp mode, and used that way it takes good pictures.

Sometimes though, when Im shooting RAW with it, I let the software do it both
ways, then use the picture that looks better, and SOMETIMES the interpolated
image looks better.




--
Larry Lynch
Mystic, Ct.

In article ,
says...
Larry writes:

On some cameras the improvement is there but only slight, on others its just
an up-sizing that gives you a bigger picture, but not a better one.

There is never an improvement.

Fuji makes several that "interpolate upward" and on the S7000 there is
USUALLY some improvement ...

There is never any improvement. It's a mathematical impossibility.




Well its wonderful that you know everything there is to know about a camera
you dont own, havent tried, and dont know **** about.

There is SOMETIMES, an aparent increse in picture detail with the Fuji S7000.
Does it make a 12mp image YES! Does it have 12mp of resolution? NO! Does it
sometimes improve the aparent resolution? YES! Even some reviewers say that
SOMETIMES it works, however, nobody that I've read recommends it, and niether
do I, so whats your problem????? Fuji sells it as a 6mp Camera (Thats what it
says on the box it came in.

Personally, I use it in 6mp mode, and used that way it takes good pictures.

Sometimes though, when Im shooting RAW with it, I let the software do it both
ways, then use the picture that looks better, and SOMETIMES the interpolated
image looks better.




--
Larry Lynch
Mystic, Ct.

It is advertising bull. There is no such thing.

--
http://www.chapelhillnoir.com
home of The Camera-ist's Manifesto
The Improved Links Pages are at
http://www.chapelhillnoir.com/links/mlinks00.html
A sample chapter from "Haight-Ashbury" is at
http://www.chapelhillnoir.com/writ/hait/hatitl.html

"Des" wrote in message
...
My camera takes photos in normal resolution but claims to be able to take
finer photos at a higher pixel-rate through "digital interpolation".
Surely that's just stretching the image and not worth doing?
Can't I improve the image to the same degree later using filters in Corel
Photopaint?

Is there any real advantage in terms of image quality between an image
that's been digitally interpolated to a higher resolution?
It's no substitute for a higher resolution CCD in the camera is it?

D.

It is advertising bull. There is no such thing.

--
http://www.chapelhillnoir.com
home of The Camera-ist's Manifesto
The Improved Links Pages are at
http://www.chapelhillnoir.com/links/mlinks00.html
A sample chapter from "Haight-Ashbury" is at
http://www.chapelhillnoir.com/writ/hait/hatitl.html

"Des" wrote in message
...
My camera takes photos in normal resolution but claims to be able to take
finer photos at a higher pixel-rate through "digital interpolation".
Surely that's just stretching the image and not worth doing?
Can't I improve the image to the same degree later using filters in Corel
Photopaint?

Is there any real advantage in terms of image quality between an image
that's been digitally interpolated to a higher resolution?
It's no substitute for a higher resolution CCD in the camera is it?

D.

Des wrote:
My camera takes photos in normal resolution but claims to be able to take
finer photos at a higher pixel-rate through "digital interpolation".
Surely that's just stretching the image and not worth doing?
Can't I improve the image to the same degree later using filters in Corel
Photopaint?

Is there any real advantage in terms of image quality between an image
that's been digitally interpolated to a higher resolution?
It's no substitute for a higher resolution CCD in the camera is it?

D.

You have asked what you might call a loaded question, if you haven't
noticed that already. From a technical point of view resolution is the
smallest object that your camera can detect. This is determined by the
number of pixels in the CCD of your camera (and the camera's optics).
Interpolation CANNOT improve resolution. The only way to improve
resolution is to have a CCD with more pixels. Some people will refer to
resolution in respects to how good a picture looks. Although this isn't
the technical definition of resolution it does get at the desired output
of high resolution (i.e. nicer pictures). This may or maynot be
improved with interpolation, but this kind of "pseudo-resolution" is in
the eyes of the beholder.

What interpolation does is increase the size of the image beyond what
the CCD generates. The process which is used basically stretches out
the image and makes educated guesses as to the color of the new pixels
it creates. Although this creates a larger image, there is no more
detail in the larger image then in the original image. In some cases
interpolation may even decrease the overall results of the image due to
the "guesses" it makes when it expands the image. Not only that, but
interpolated images are larger, so you'll be able to take fewer pictures
if you interpolate.

As for what you should do in terms of taking pictures, my advice would
be to take the pictures at your cameras maximum resolution without
interpolation. This will let you get 100% of your camera's resolution,
without wasting any space on your card. If you want to interpolate or
otherwise alter your images afterwards you can do so with a graphics
program such as Paint Shop Pro or Photoshop. These graphics programs
have multiple other filters you can use, aside form interpolation, so
you'll be able to adjust your images to a greater extent on-computer
then you can on the camera.

Bryan