ER Mapper .ECW Import Options Dialog
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Customize the ECW pixel reduction, import region, or read-only import in the ECW Image Import Options dialog. |
Image Preview
The preview section displays a picture of the area to be imported. The preview section contains a low resolution preview of the area.
- Click the
buttons on the left side of the image preview to zoom in or out on the area. Changing the zoom level does not affect the area to import. The area to import is indicated in the preview section by a yellow outline. - Click the
button to fit the entire image in the preview window. - Click the
button on the left side of the image preview to quickly move the image in the preview section. Click and hold the left mouse button down and drag the image to change the view. Changing the view does not affect the area to import. The area to import is indicated in the preview section by a yellow outline. - Click the
button on the left side of the image preview to change the extents of the image that is imported. The initial region includes the entire image extents. Click and hold the left mouse button down and drag the mouse over the area to import. The zoom extents update and the yellow box coincides with the area drawn. The Region selected for import section also updates. Only the portion of the image highlighted by the yellow box will be imported.
Import Region
The region for import can be selected in the image preview or in the Region selected for import section. The initial region includes the entire image extents. Type a value in pixels into the Top, Left, Right, and Bottom fields to specify the imported region. The yellow outline in the image preview is updated as the values are changed.
Pixel Reduction
Since some ECW images can be extremely large once expanded into memory, the import filter allows the image to be reduced in dimensions by 1/2 to 1/32 of the original size via the options in the ECW Image Import Options dialog. Choose from 1/1 (Uses the most memory, best quality), 1/2, 1/4, 1/8, 1/16, to 1/32 (Uses the least memory, lowest quality). The Final dimensions field displays the final dimensions of the imported region. The Estimated size field displays the estimated image size in Megabytes (MB).
Read-only Import
The Full resolution read-only 'on-the-fly' ECW image option imports the full ECW file in its native form as a highly-compressed, read-only image. If a portion of the image is needed for display or output, the necessary portion is extracted and decompressed "on the fly." This option provides quick import and interactive panning and zooming without using large amounts of RAM or disk space. However once an image is imported with Full resolution read-only 'on-the-fly' ECW image checked, the image cannot be modified.
See Also
ER Mapper .ECW File Description
ER Mapper .ERS Grid File Description