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Raster Manager has a memory pool that's used to store the most recently requested raster's data. This on-demand access capability of Raster Manager allows the attachment of images that are several gigabytes in size completely independent of the available RAM capacity. It then loads the portion of the raster that's visible and only at the resolution that best fits the current view's resolution in units per screen pixel. Raster Manager starts loading the raster data only when the image becomes visible on at least one view. When an image is attached in Raster Manager its data is not automatically loaded in memory. Those strategies are: on-demand access, RAM caching, file improvement (caching) and independent viewing process. Raster Manager uses a different strategies to display very large images smooth, fast and with limited, configurable memory usage. Snappable: This option specifies if the raster is snappable or not. The general pane contains the following options to apply to the attachment:
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However, after being attached a clip can be subsequently set and saved with the attachment. Note: Aside from iTIFF and iTIFF64, a raster cannot have a clip when it's first attached since other formats don't support the saving of a clip.
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The attachment options are then applied to the selected file(s). In the above example, the list contains two files: SinglePage.bmp and MultiPages.gif. The top pane displays a list of rasters that were selected in the Attach Raster Reference dialog. The Raster Attachment Options dialog is shown below. Those options can be set on the Raster Attachment Options dialog, which is shown only when Open Settings Dialog is checked on the Attach Raster Reference dialog. Raster Manager offers a variety of options that can be specified during the attachment of an image. Tip: For the most current list of supported input and output file types, please refer to MicroStation's Help > Supported Input File Formats and Help > Supported Output File Formats. ** C: Can store DEM as well as imagery , O: Can only store DEM data Raster Manager supports dozens of different file formats, which are listed in the table below. This allows the creation of files that exceed 4 gigabytes in size.
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iTIFF64 - This is the latest proprietary file format that uses an internal 64-bit pointer for the indexing the raster data.Instead, it's created and used when needed which is determined by the original file format, the cache settings and on-the-fly transformation of the attached image. The cTIFF file format cannot be created or attached directly in Raster Manager. cTIFF - The cTIFF file format is very similar to the iTIFF file format but it is used as a cache file format.Performance tip : To improve performance when working with images in Raster Manager or Descartes, consider converting old HMR files to iTIFF. Its most important advantage over the HMR file format is its support for 24 bits RGB and 32 bits RGBA color space. iTIFF - The iTIFF file format was developed to replace the HMR file format.This format has been replaced by the iTIFF file format. HMR - The HMR file format is the first proprietary file format that was developed and supports only 2 or 256 colors.The Raster Manager also supports four proprietary file formats that were designed to ensure maximum performance for visualization and the editing with Bentley Descartes: Raster Manager supports many geospatial enabled as well as non geospatial file formats. Being the principal module in MicroStation for attaching rasters, Raster Manager is able to open and display more than 30 file formats of any size, and is only limited to RAM memory capacity.