Printing actual size on paper?

  • Thread starter Thread starter js5895
  • Start date Start date
J

js5895

I drew a circle in MS paint that is 6" in size, and I want
it to print that size on paper, I know it's a formula like,
DPI x inches or something, but, I don't know it.
Can anyone help?

Thanks, for all your help.
 
js5895 said:
I drew a circle in MS paint that is 6" in size, and I want
it to print that size on paper, I know it's a formula like,
DPI x inches or something, but, I don't know it.
Can anyone help?
Click to expand...

Ok say you want a 6" diameter circle and are printing at 300dpi.
Create an circle 6 x 300 = 1800 pixels diameter.
 
That's not going to work because, at 576x576 it's 8 inches on
paper, and at 1800 it would be way too big.

Thanks.
 
js5895 said:
That's not going to work because, at 576x576 it's 8 inches on
paper, and at 1800 it would be way too big.
Click to expand...

Ok a quick fix...

If 576 = 8" then you need to draw a circle

576 *6/8 = 432 (of whatever units you are using)
 
Yea I know, about that web site, I read this one:
http://www.scantips.com/no72dpi.html
I know, 432x432 is 5-31/32, almost 6", it seems to be 72 DPI, 72 x 6",
but,
I don't have that set anywhere. I just would like to know what's the
formula and if I change my screen's DPI or resolution, will it change?.
I
know if I change my printer's DPI it will change. I think the answer is
on that web page.

Thanks, for your help.
 
js5895 said:
Yea I know, about that web site, I read this one:
http://www.scantips.com/no72dpi.html
I know, 432x432 is 5-31/32, almost 6", it seems to be 72 DPI, 72 x 6",
but, I don't have that set anywhere.
Click to expand...

Are you using MS Paint? Try Image -> Attributes
I just would like to know what's the formula and if I change my
screen's DPI or resolution, will it change?
Click to expand...

The printed diameter should not change. The size on screen might change
but....

I know this is confusing but it's usually best to ignore the size of the
circle on the screen unless the program you are using also displays a scale
rule to compare it with (eg MS word). Why?.. because

1) the size on screen depends on your monitor. If you connected your
computer to the display at your local football ground the SAME circle you
created could be 20ft across but it would still print out the same size.

2) With most programs you can zoom in and out. That changes the aparent size
without changing the actual size in the file.

What really matters is:

a) the dpi settings in the program used to create the image (eg 100 dpi)
b) the number of dots across the diameter of the circle (eg 600)
c) any scaling introduced by the printer or printer driver (printer scale eg
1:1 , 2:1 etc)

formulae is

Diameter = (Number of dots across/image dpi) * (printer scale)

If the printer scale adjustment is given in dpi then...

Diameter = (Number of dots across/image dpi) * (printer dpi/image dpi)

and if printer and image dpi are the same then it's simply

Diameter = Number of dots across/image dpi

At least that's how I understand it!

Colin
 
Well I did some printing at different settings, screen DPI has nothing
to do with it and printing quality DPI has nothing to do with it,
you're
right it's the screen, and I think I have the formula:
(width in pixels) x (monitor width in inches) = DPI,
then (DPI) x (inches desired) = image size in pixels. Thanks, for your
help.

Thanks.
 
Back
Top