[Gimp-user] At 100%, my selection hasn't the size it should have

[qsdqsd <forums gimpusers com>]

Thank you both of you for the answer.
So if I understand well, to have the printed dimensions I want, it is not
necessary to resize the image or play with the scale tool. All the more so as I
get a quality loss by doing so, right ? But what I can do is do some calculation
with the method below.

> When editing images for print, step one is to decide what the size in
> inches or cm the printed image will be, and the resolution needed in
> pixels per inch or cm.  Multiply the physical size of the finished
> printed image by the desired resolution, to find the height and width
> in
> /pixels/ of the image file you need to create. 

Get the correct amount of pixels height and width. After checking the printed
dimension in Image --> Properties, I can eventually adjust these parameters with
the scale tool.
Tell me if I am right, with this method, on the screen, at 100%, I will not have
the correct size ? Because it is only an information for printing ? In my case,
when I do like that, the size dimension on the screen doesn't change at all, but
the values in "Image --> Properties" do.

I tried to figure out how I could get the same result by only changing the ppi.
Is there a calculation that allows to get the same result that with the first
method ?

thank you again

-- 
qsdqsd (via www.gimpusers.com/forums)