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

Ahah I have another question because I realise that for what I really
need, maybe this is not the correct solution..

Actually, I have six photos. I must put these photos on two .jpg files
in order to print only two files instead of six. And also to see at
the same time differents details of the same object. Of course, these
elements are all different one compared to the other. They have
different size. So I guess that what I did first with the ppi
calculation to have the correct printed size is good for one photo
right ? But it doesn't work anymore if I must put these photos on the
same file ? I suppose that I must first resize them one compared to
the other ? Or is there some trick I don't know ?

You can go back to the first posts.

Gimp is a raster editor that works in pixels. If you use the measure tool
between two defined points and it is 100 pixels in first image and 120 pixels in
second image then to match, one of the images has to be scaled in the ratio

Another way is adding images as layers. When you open the first image (base
layer) then **open-as-layers** a second image. The second layer takes the
properties of the first image. The second layer can be scaled in place.

I am not sure if this is what you want but layers can be 'matched' using
plugins, it is called image registration.

This example uses a plugin ofn-layer-aligner.py from

The top layer in screenshot 1 is rotated and scaled to match the base layer as
screenshot 2. Notice how the whole layer is scaled (dotted line) and could be
lost if you do not resize the canvas.

If you are going to put 3 images side-by-side in a jpeg obviously a bit more
work is required. But the earlier comment still applies. The additional images
will take the properties (ppi etc) of the first opened image.

rich: www.gimp-forum.net

* http://www.gimpusers.com/system/attachments/798/original/skewed.jpg
* http://www.gimpusers.com/system/attachments/799/original/scaled-rot-moved.jpg

rich404 (via www.gimpusers.com/forums)

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