This may be more a GIMP question than an SL question but given our scientific leaning I figure maybe someone has run into this. I'm trying to use SL's version of GIMP (SL 4.1; GIMP v2.0.5) to combine several astrophotographs into a final image. For those new to the process of digital CCD astrophotography, rather than take one long exposure (for deep sky objects) several shorter exposures are taken and post-processed using imaging software such as Adobe PhotoShop to "merge" the images into a final picture. The essential technique is to introduce each photo as a layer and flatten the image to combine corresponding pixels to create a brighter rendition. When I use layers in GIMP's Layer Dialog, I can freely create (empty) layers and see them stacked one over the other above the background image. But when I attempt to do the same thing when inputting the images, the layers dialog behaves differently. Each new image is displayed above the background layer, displaying only two layers. I can see the images loaded and they are all assigned a distinct layer. It's the Layers Dialog that fails to show all these layers stacked above the background. Is this a bug or a feature? Is this layering-of-existing-images something that GIMP can do? Or am I expecting too much? r.m. (a GIMP newbie) (you may respond to me directly) --------------------------------- Sponsored Link Mortgage rates near 39yr lows. $420,000 Mortgage for $1,399/mo - Calculate new house payment