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


I have an image and I'd like to define the dimension of a selected
area. I fisrt select the area that I want to resize. I then select the
tool (Shift + T) and resize the selection. I noticed that after
resizing, when I visualize the image with a 100% scale, the size of
the image is not correct. I have not a little difference of one or two
millimiters that could be due to the screen or whatever. But a big
difference (30cm instead of 35cm in my case).
Is it a normal display problem ? I mean, if I print it, will the
dimensions be good ?

First and most important. Gimp is a raster editor and works in pixels. It can
show cms as units for your convenience, but it still works in pixels.

If you are not sure about the printing size. Check Image -> Image Properties and
that shows information: Size in Pixels / Print Size / and Resolution (ppi)

Another way is turn off View -> Dot-for-Dot  see:

Providing the screen resolution is correctly set then, at 100% the image
displays as it is printed. See screenshot

Second question :
with this method of resizing, I only resize the selection. But what
I'd like to do is to resize the hole image thanks to a reference
within the image whose size is known. For example. if there is a rule
on the image, I'd like to resize the whole image thanks to a size
reference given by the rule.

Second Question. Not sure what you want.

A selection can be set to show centimetres in the tool options. Use the value
from that selection to enter into Image -> scale image. You might have to break
the link if the width / height proportions are different. See screenshot

rich: www.gimp-forum.net

* http://www.gimpusers.com/system/attachments/788/original/dot-for-dot.jpg
* http://www.gimpusers.com/system/attachments/789/original/thesame.jpg

rich404 (via www.gimpusers.com/forums)

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