Hi,
>
> How can I use GIMP without specify the image size and let is
> automatically determines the image size?
there is a command that creates a new image using the content of the
clipboard. It is located in the file->acquire submenu and
you can find a description at http://docs.gimp.org/e
> I am using windows and want to grab a window, I use the following method:
>
> 1. ALT + printscreen (copy);
> 2. use GIMP for a new file;
> 3. Crtl + v to paste.
>
> Now in step 2 I have to specify the image size, but I have no idea how big
> the image is. Every time I have to adjust the image
