Size of an image
Nov 18, 2019 11:18:38 #
This is just an example: if there is a image that is 2400 x 850 pixels is there any way to know the size in inches if I know no other info about this image? Thanks.
Nov 18, 2019 11:20:40 #
will47 wrote:
This is just an example: if there is a image that is 2400 x 850 pixels is there any way to know the size in inches if I know no other info about this image? Thanks.
If you know the pixel per inch count it just take basic math. IE 2400/300 ppi =8"
Nov 18, 2019 11:58:28 #
Nov 18, 2019 12:03:36 #
will47 wrote:
This is just an example: if there is a image that is 2400 x 850 pixels is there any way to know the size in inches if I know no other info about this image? Thanks.
The size in inches where? On the monitor or on a print? For the screen you need to know how many pixels per inch you have on your screen. For a print you need to know how many pixels per inch you are going to make the print.
Nov 18, 2019 13:00:27 #
It really depends on what you are doing with the image.
2400 X 850 = 2,040,000 pixels, or 2 MP. Not at common aspect ratio. How big this is in inches depends on where you put it. Printers like 300 pixels per inch (ppi) so that would make an 8 X 2.8 inch print. But there is no rule that you must print at 300 ppi.
My monitor is running 1152 X 864 pixels and is 15 X 11 inches, or so. At full resolution that image would more than fill the screen horizontally twice and just fill it vertically.
2400 X 850 = 2,040,000 pixels, or 2 MP. Not at common aspect ratio. How big this is in inches depends on where you put it. Printers like 300 pixels per inch (ppi) so that would make an 8 X 2.8 inch print. But there is no rule that you must print at 300 ppi.
My monitor is running 1152 X 864 pixels and is 15 X 11 inches, or so. At full resolution that image would more than fill the screen horizontally twice and just fill it vertically.
Nov 18, 2019 13:03:33 #
The answer depends on your printer resolution and simple math:
(image size in pixel)/(printer resolution pixel per inch)=printed image in inches.
(image size in pixel)/(printer resolution pixel per inch)=printed image in inches.
Nov 18, 2019 13:29:16 #
will47 wrote:
This is just an example: if there is a image that is 2400 x 850 pixels is there any way to know the size in inches if I know no other info about this image? Thanks.
No
Nov 18, 2019 13:41:58 #
rebride wrote:
No
And that is definitively the right answer. I got caught up in 'printing' when the question was:
w/o any other information.
I need to learn to read!!!
Nov 18, 2019 13:54:51 #
rebride wrote:
No
Right. All the answers that gave dimensions added information that the OP said was unavailable.
Nov 18, 2019 13:56:49 #
Rongnongno wrote:
And that is definitively the right answer. I got caught up in 'printing' when the question was:
w/o any other information.
I need to learn to read!!!
w/o any other information.
I need to learn to read!!!
I knew you knew better.
Nov 18, 2019 13:57:04 #
rebride wrote:
No
Disagree. If you know the pixel dimension and the PPI you can figure out the image's file size. A print size can be anything you want to make it but the image file size is basic math.
Edit, I just reread the original post. The OP didn't mention a PPJ so the answer is indeed NO
Apologies
Nov 18, 2019 14:22:15 #
An image file doesn't have any dimensions per se, it is just a data array of so many pixels in a row and so many rows. The display or printer software decides what to do with it.
Nov 18, 2019 14:30:07 #
bleirer wrote:
An image file doesn't have any dimensions per se, it is just a data array of so many pixels in a row and so many rows. The display or printer software decides what to do with it.
If the ppi is known, there is a native size which can be calculated. For instance when using photo shop and you have an image open, using the magnifier tool when you right click you are given several choices of display size. 100%, 200% or print size. Clicking on print size will display an image at the native size (if you have PS set up correctly)
Nov 18, 2019 14:40:35 #
Rich1939 wrote:
If the ppi is known, there is a native size which can be calculated. For instance when using photo shop and you have an image open, using the magnifier tool when you right click you are given several choices of display size. 100%, 200% or print size. Clicking on print size will display an image at the native size (if you have PS set up correctly)
May I remind you that the question includes the following:
"if I know no other info about this image"????
That is why there is no answer however you want to slice it. I made the same error because I had not paid attention to the original question and like many went into you can using this or that... There is no 'this' or 'that'
A pixel has no size per say, it just the smallest amount of data used to create an array that in turns becomes an image. Sensors have a pixel per inch density that is then transformed into another pixel per inch on display, print, projection - whatever. None of these pixel has a size EVEN if the original gizmo to create that pixel had a microscopic size.
Nov 18, 2019 14:43:13 #
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