Could anyone show me a way (not Image Sampler) to insert a image (like a personal logo) into GH canvas?! And it should be shown whenever I open the GH file. See the example in the image file attach.
That screenshot is just of Grasshoppers Export Quick Image. If you want to add a logo to a gh definition just draw a line on the Gh canvas with the pencil, right click it and select load from Rhino, then select the Rhino curves.