Anyone knows how to upgrade a pix at 1200px  X  1600px, 72dpi  to 1200px  X
1600px, 300dpi?

>Anyone knows how to upgrade a pix at 1200px  X  1600px, 72dpi  to 1200px
> X 1600px, 300dpi?

Yes. Use the Image Size command and turn "Resample Image" OFF.

"Resample" means "change the number of pixels." If resampling is turned off,
the pixel dimensions will be identical--a 1200x1600 pixel image will still b
e
1200x1600 pixels. The resolution will change, and the size of the picture wh
en
it is printed out will change.

--
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the photo has 1200 x 1600 pixels...it has no dots per inch until you tell it
how many inches it will be. Often your viewer/editor will default to some
DPI...but that is illusory. It means nothing. Change the number under image
size and no resampling and the numbers change...but the file will not.


"Red Ant" <hugo@klkh.com> wrote in message news:40b3732c_2@news.tm.net.my...
> Anyone knows how to upgrade a pix at 1200px  X  1600px, 72dpi  to 1200px
X
> 1600px, 300dpi?
>
>

"Red Ant" <hugo@klkh.com> wrote:

> Anyone knows how to upgrade a pix at 1200px  X  1600px, 72dpi  to
> 1200px  X 1600px, 300dpi?

Yes, this is very basic.
You should be able to do this with no problem.

The Doormouse

--
The Doormouse cannot be reached by e-mail without her permission.

"Tacit" <tacitr@aol.com> wrote in message
news:20040525123948.05832.00001852@mb-m03.aol.com... 
>
> Yes. Use the Image Size command and turn "Resample Image" OFF.
>
> "Resample" means "change the number of pixels." If resampling is turned
off,
> the pixel dimensions will be identical--a 1200x1600 pixel image will still
be
> 1200x1600 pixels. The resolution will change, and the size of the picture
when
> it is printed out will change.
>
> --
> Biohazard? Radiation hazard? SO last-century.
> Nanohazard T-shirts now available! http://www.villaintees.com
> Art, literature, shareware, polyamory, kink, and more:
> http://www.xeromag.com/franklin.html
>


If i want the pixel dimensions and the document size to be remained but only
the dpi change to 300dpi, can i do it this way:
1) turn of the resample and change the dpi to 300, then
2) turn on the resample and set the document size back to its original.
Does that cause any lose in pix quality?

Image>Image size, then uncheck "resample image" and change resolution to
300, click "OK."  But I wouldn't consider that an "upgrade" since the
picture will still be 1200x1600.

Don


"Red Ant" <hugo@klkh.com> wrote in message news:40b3732c_2@news.tm.net.my...
> Anyone knows how to upgrade a pix at 1200px  X  1600px, 72dpi  to 1200px
X
> 1600px, 300dpi?
>
>

On Wed, 26 May 2004 01:10:50 +0800, "Red Ant" <hugo@klkh.com> wrote:

>
>"Tacit" <tacitr@aol.com> wrote in message
>news:20040525123948.05832.00001852@mb-m03.aol.com... 
>off, 
>be 
>when 
>
>
>If i want the pixel dimensions and the document size to be remained but onl
y
>the dpi change to 300dpi, can i do it this way:
>1) turn of the resample and change the dpi to 300, then
>2) turn on the resample and set the document size back to its original.
>Does that cause any lose in pix quality?

No. That causes loss of mathematics.

DPI is dots per inch, or with regard to computer images pixels per
inch.

So the formula is as follows:

pixels divided by inches is DPI

So when you increase the DPI with the number of pixels constant your
document size will shrink. And when you increase dpi with the document
size constant the number of pixels will increase too.

Michael

>If i want the pixel dimensions and the document size to be remained but
>only
>the dpi change to 300dpi, can i do it this way:

You say you want the pixel dimensions to stay the same. Then you say you wan
t
the document size to stay the same. That is impossible.

If you resample the image, the document size will stay the same, but the pix
el
dimension will change.

If you turn off resampling, the pixel dimensions will stay the same, but the
document size will change.

I am not clear on what you are asking. However, resampling an image ALWAYS
degrades its quality. Always. You can not invent image detail that does not
exist in the original; it is impossible to resample an image to increase its
resolution and have the result be as good as if you had simply made the imag
e
at the proper size and resolution to begin with.

--
Biohazard? Radiation hazard? SO last-century.
Nanohazard T-shirts now available! http://www.villaintees.com
Art, literature, shareware, polyamory, kink, and more:
http://www.xeromag.com/franklin.html

The most reliable way to interpolate an image up to a higher resolution is
by using proprietory software like Genuine Fractals. Another method which
works well is to use 'stair interpolation'. Basically this uses bicubic
resizing in Photoshop in 10% increments until the size is reached. Either
way, expect some degradation of the image. How much depends on how good the
original is.

W&W
----------------------------
"Red Ant" <hugo@klkh.com> wrote in message news:40b3732c_2@news.tm.net.my...
> Anyone knows how to upgrade a pix at 1200px  X  1600px, 72dpi  to 1200px
X
> 1600px, 300dpi?
>
>

"Not for Publication" <wilder_4_awhile@yahoo.com.au> wrote in message
news:2hhqiaFbehajU1@uni-berlin.de...

> The most reliable way to interpolate an image up to a higher resolution is
> by using proprietory software like Genuine Fractals.  [...]

Booo.