When obtaining spatial imagery for use with Geographic Imager, whether from an online source, commercial vendor, government office or a source within your organization, there are a number of important considerations to keep in mind. Use the File > Open command to view the list of reference files supported by Geographic Imager and try to obtain data in one of the formats supported. In cases where the file format is native to a particular mapping application and is not supported by Geographic Imager, you can often request the data provider to export a file in one of the supported formats.
When obtaining data, acquire as much metadata as possible. If an image is received in any format other than GeoTIFF, obtain a reference file in one of the formats supported by Geographic Imager. It is important to obtain the name of the projection, the datum, and the units because subsequent reprojection of data relies on this information.
TIFF and BigTIFF files opened using Advanced Import do not support layers, text, and other Adobe Photoshop-specific image features. Generally, satellite imagery would not contain any of these features which are added later using Adobe Photoshop. TIFF files that are opened using just Adobe Photoshop (e.g. not with Advanced Import) are not affected.
Opening any files over a cross-platform network may increase load times.
Known Adobe Photoshop Limitations
|
Task or Operation |
Limitation |
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Select > Color Range |
The preview is based on an 8-bit image. The actual selection on a 16-bit image may be different from the preview. |
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Magic Wand tool |
This tool makes a selection based on an 8-bit image, even if the image is in 16-bit mode. It is preferable to select by Color Range. |
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Filter > Render > Lighting Effects |
This filter only works on 8-bit images. Converting an imported DEM from 16-bit to 8-bit incurs data loss in height resolution, therefore this filter should be used at the end of a workflow. |
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Gradient Map Adjustment Layer |
A gradient map adjustment layer can be used to colorize a DEM. Adobe Photoshop uses the grayscale value of every pixel to assign a new color. This means that the gradient map is scaled to (0 to 100) the DEM elevation range. Applying the same gradient map to two separate DEM files will give different colors to the same elevation values. This must be taken into consideration before using the Geographic Imager Mosaic function. |
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3D Features |
Photoshop has discontinued its support of 3D features, and as such we no longer support 3D features in Geographic Imager. For more information please see the link here |
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Apple Silicon and 3D features |
3D features are not optimized for native performance on Apple Silicon machines. Adobe does provide some more information and details here |
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