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Suppose you have a drawing and you want to create an image with a specific coordinate system and pixel size covering that drawing entirely. You don't know what rectangle the image should have (you can compute it manually, but that's error-prone, etc). Here's what you can do: create a blank image with the desired coordinate system and pixel size (coordinate system metrics). Open the image. Drag and drop the drawing into the window with the image. Make the image layer active. Invoke Edit - Join, select drawing as a source component, specify any join rule for channel 0 (eg, set it to 'count'), click 'Resize image', then click Join Component. This should transfer the drawing onto the image and resize the image to the extents of the drawing. You can delete the resulting tiles if you don't want them.
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