O/T: Nibbling on an Apple

In article , Sandman
wrote:

if you print it, then the ppi is determined by the number of pixels /
size of print. if you don't print it, then there is no ppi because
there are no inches.

What does print have to do with anything. Stop twisting.

i'm not twisting a thing. ppi is only relevant when printing. if you're
not printing, it's meaningless.

Ehm, that's the other way around. "PPI" is for displays and monitors.

ppi for a display is a physical property of the display. it's the
number of pixels of the display divided by its size. what gets
displayed on it doesn't change that.

ppi also applies to printing images. it's the number of pixels of the
image divided by the size of the print. if you have a 3000x3000 image
and print at 300 ppi, you get a 10 inch square image. if you don't
print, there's no ppi. it's just pixels.

How many pixels are shown per inch on a display. That is irrelevant to
printing. Your monitor showing 350 PPI doesn't mean anything when you
print the image

true, but that also has nothing to do with the tag in the image or how
big it is when printing.

"DPI" means "Dots per inch" and is only relevant to printing. How many
separate ink dots it can put per inch of media.

correct.

A 100x100 image will be 1 inch x 1 inch on a 100 PPI screen and print as
1 inch x 1 inch when printing as a 100 DPI image on a printer.

no. it's 100 ppi sent to the printer. the printer uses multiple dots
per pixel. for an epson printer, it's 720 or 1440 or 2880 dpi. if you
send an image with 360 ppi to the printer at 1440 dpi, you are printing
with 16 dots per pixel, or a 4x4 block.

http://en.wikipedia.org/wiki/Pixel_density

http://en.wikipedia.org/wiki/Dots_per_inch

A digital image can record a DPI value which sometimes is referred to as
both DPI and PPI since neither really applies - it's just a command for
if and when the digital image should be representaed in the physical
world.

the tag is ppi and it's mostly ignored.

the actual ppi is how many pixels you send to the printer and how big
of a print you're making.

dpi is a function of the printer and cannot be changed, other than the
quality setting or by getting a new printer.

In article , PeterN
wrote:

The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

exactly the same.

On 8/13/2013 3:32 PM, nospam wrote:
In article , PeterN
wrote:

The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

exactly the same.


You really should open the image in a photo editor, and look at the
result. But, you would never admt being wrong.



--
PeterN

In article , PeterN
wrote:

The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

exactly the same.

You really should open the image in a photo editor, and look at the
result. But, you would never admt being wrong.

don't need to. a 651x400 image is the same size as a 651x400 image.

it's *you* who is wrong and won't admit it.

On 8/13/2013 4:29 PM, nospam wrote:
In article , PeterN
wrote:

The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

exactly the same.

You really should open the image in a photo editor, and look at the
result. But, you would never admt being wrong.

don't need to. a 651x400 image is the same size as a 651x400 image.

it's *you* who is wrong and won't admit it.


In ppi they are the same.
Try reality.
Assume an object is 600 x 1200{ At 60 ppi what is the length in inches.
If that object has aresolution of 90 ppi what is its lenght in inches.
@ 10 ppi, what is its length in inches.

Since you refuse to test my theory, try the simple math. Certainly a
computer guru like you, should understand basic arithmetic.

For me this is EOD

--
PeterN

In article , PeterN
wrote:

The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

exactly the same.

You really should open the image in a photo editor, and look at the
result. But, you would never admt being wrong.

don't need to. a 651x400 image is the same size as a 651x400 image.

it's *you* who is wrong and won't admit it.

In ppi they are the same.

so you agree they're the same.

Try reality.

it is reality. 651x400 = 651x400. it's basic arithmetic. actually it's
even easier than basic arithmetic.

the tag doesn't change a thing.

Assume an object is 600 x 1200{ At 60 ppi what is the length in inches.
If that object has aresolution of 90 ppi what is its lenght in inches.
@ 10 ppi, what is its length in inches.

only if you're printing, which i said originally.

on screen, they are exactly identical (other than the meaningless tag).

since you said to 'open the image in a photo editor', you are clearly
*not* referring to printing the image, and nobody would print at 10 ppi
anyway.

in other words, as has been said many times, they are identical.

Since you refuse to test my theory, try the simple math. Certainly a
computer guru like you, should understand basic arithmetic.

not only do i understand basic arithmetic, but i understand quite a bit
more.

you, however, do not understand what you're doing or what the numbers
mean.

For me this is EOD

translated: you are wrong and won't admit it and don't want to make a
bigger fool of yourself, so you will stop posting nonsense.

In article ,
PeterN wrote:

lets forget all the technoblab.
The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

The lower number produces the largest physical representation. 24 dots
per inch is fewer than 96, so more inches are needed for all the dots to
be displayed.

A 651 x 400 image printed ad 24 DPI would be 27 x 17 inch. Each pixel
would be


Again, the term "PPI" refers to your monitor, not to the image. "DPI"
refers to printed size of the image, which is what you set in Photoshop.

At times, these are used interchangeably by software, but that's not
strictly correct.


--
Sandman[.net]

In article ,
PeterN wrote:

On 8/13/2013 3:32 PM, nospam wrote:
In article , PeterN
wrote:

The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

exactly the same.


You really should open the image in a photo editor, and look at the
result. But, you would never admt being wrong.

On your ~100 ppi screen both images are exactly the same.

Printed on paper, they are quite different.

Do I need to go over it all again?


--
Sandman[.net]

In article ,
PeterN wrote:

The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

exactly the same.

You really should open the image in a photo editor, and look at the
result. But, you would never admt being wrong.

don't need to. a 651x400 image is the same size as a 651x400 image.

it's *you* who is wrong and won't admit it.

In ppi they are the same.
Try reality.
Assume an object is 600 x 1200{ At 60 ppi what is the length in inches.
If that object has aresolution of 90 ppi what is its lenght in inches.
@ 10 ppi, what is its length in inches.

Since you refuse to test my theory, try the simple math. Certainly a
computer guru like you, should understand basic arithmetic.

Why did you ignore this part of my previous post:

Here is a JPG in 100 DPI:

http://sandman.net/files/star_100dpi.jpg

And here is the exact same image, and the DPI has been changed to
*3000* in Photoshop:

http://sandman.net/files/star_3000dpi.jpg

Download them and open the in Photoshop and go to Image Size and see
the DPI (which Photoshop have saved to the file as a command value,
not altered the image data).

But as you can see, they are both 512x512 pixels big, only when I
print the first one it will print as a 5.12 x 5.12 inch big star
while the second one will print as a 0.171 x 0.171 inch star on the
paper.

PPI = your screen
DPI = on your paper

Neither changes the dimensions of your image.





--
Sandman[.net]

In article , Sandman
wrote:

lets forget all the technoblab.
The first image is 651 x 400 @ 96 ppi
The If you make the same image 651 x 400 @ 24 ppi

Which image will be larger in inches.

The lower number produces the largest physical representation. 24 dots
per inch is fewer than 96, so more inches are needed for all the dots to
be displayed.

no. they are exactly the same size on screen.

if they're printed, the ppi is defined by how big of a print it is.

he said to just change the ppi tag in the image editor, leaving the
pixel dimensions the same. that does nothing. they are the same size.

A 651 x 400 image printed ad 24 DPI would be 27 x 17 inch. Each pixel
would be

and if it's not printed, which it is not, they are the same size.

Again, the term "PPI" refers to your monitor, not to the image.

no, ppi refers to printing.

displays do have ppi, but that isn't specific to any image or text or
whatever else is on the screen.

"DPI"
refers to printed size of the image, which is what you set in Photoshop.

no, dpi refers to the printer itself, specifically how it prints the
pixels.

each pixel is made up from multiple dots of multiple inks, usually 4
(cmyk) or 6 (ccmmyk), but can be more or even a different mix of inks,
such as hexachrome.

At times, these are used interchangeably by software, but that's not
strictly correct.

they may be used incorrectly and it's often obvious what is meant, but
it's still wrong when they're used improperly.