The Mosaic function in Geographic Imager merges multiple georeferenced images together to create a single composite georeferenced image. Though the goal of the mosaic is to create a single and seamless composite image, combining images with the Mosaic tool will often result in a slight shift of the imagery due to differences in the original pixel registration grid. This means that even when images are in the same coordinate system with the same spatial resolution, error can still be introduced because of a difference in the pixel alignment. Due to this, mosaicking processes in general tend to produce results that may be very close, but not exact. With this in mind, the results of your mosaic may be improved by resampling your images beforehand to the smallest unit of the resolution.
As an example, let's say we have an image where the pixel size is 2.00 metres. When plotting the X coordinates of every pixel in this image (using the top left corner of the pixel), the X coordinate value will be incremented by the number/distance of the pixel size. For example, if the X coordinate values were to start at 111.00, then the next pixel would be 113.00, 115.00, 117.00, and so on. It's important to note that these coordinate values are discrete, which means that the values could not be 113.22 or 115.77 because the origin of the coordinate in this case starts at 111.00 metres.
Would you like to export your Adobe Illustrator document to an image? Here is a good tool available through MAPublisher (available in version 9.2 and higher).
Our friends in the map library at Brock University in St. Catherines, Ontario have put together a very nice how-to on creating super overlays for Google Earth using Geographic Imager and Adobe Photoshop.
These instructions describe the process of georeferencing a high-resolution image, creating a geotiff file, using Google Earth Pro to make a super overlay and how to provide access to others. The full process is outlined here http://www.brocku.ca/maplibrary/Instruction/Creating-a-Super-Overlay-in-Google-Earth.pdf
The Brock University Map Library can be contacted at firstname.lastname@example.org
The Adobe Creative Suite SDK Team confirmed that there is a bug in Adobe Extension Manager CS5 and CS5.5 that prevented extensions from being installed on Mac OS 10.7. (Adobe: Creative Suite SDK Team Web page). This affects the installation of Geographic Imager for Adobe Photoshop CS5 and CS5.5 on Mac 10.7. This does not affect Windows users.
After the Geographic Imager installer is complete, start Adobe Photoshop. The extension "Geographic Imager" is not available from Window > Extensions. As a result, Geographic Imager Main panel will not be available.
Currently, our development team is working on this issue. Also, Adobe announced that the fix for this issue will ne available in the next two weeks through Adobe Update Manager. Meanwhile, below is a temporary solution provided by Adobe team for developers and end users.
NOTE: Prior to performing these steps with your data you would want to ensure that the DEM and image have the same geographic extents.