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"Raster 3: {Memory} RXD Result," and it is automatically displayed in the Image window.
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ENVI Tutorial: Working with ENVI Zoom
 Tutorial: Working with ENVI Zoom
8. Explore this image, when you are finished looking at it, right-click on the Raster 3: {Memory} RXD Result in
the Layer Manager and select Remove Selected Layer to remove it from the display.
9. Click the Data Manager button on the toolbar. Notice that the RXD result is still available (it has not been
deleted; it is at the bottom of the list). You have just removed it from the display.
10. Close the Data Manager.
Working with a Portal
A Portal is a window inside the Image window that allows you to view multiple layers in the Layer Manager
simultaneously. A Portal works as a separate layer (inside the Portals folder) in the Layer Manager. In this step, you will
compare the true-color and CIR Jasper Ridge layers.
1. In the Layer Manager, right-click on the Raster 2: jsp99hym.eff (the true-color image) and select Order
Layer �! Bring to Front. This will place the Raster 2 image at the top of the layer list.
2. Click the Portal button on the toolbar. ENVI Zoom creates a new Portal from the second layer in the Layer
Manager, which is the Raster 1 CIR image. ENVI Zoom adds the new Portal to the Portals folder in the Layer
Manager.
3. Click and drag inside the Portal to move it around the Image window.
4. Click and drag on a corner or side of the portal to resize it.
5. Click the Pan button on the ENVI Zoom toolbar. Grab the true-color image (click outside of the Portal) and
drag it around in the Image window. Notice how the Portal stays in one location while the image moves behind it.
6. Click the Select button to exit the Pan tool.
Pinning the Portal to the Image
You can attach (or pin) the Portal to the image so that the Portal moves with the data (vice moving and panning with the
image as you did in the last exercise). This way, when you pan the image, the Portal stays fixed to its original position
relative to the data.
1. Click once inside the Portal to select it, then place your cursor at the top inside of the Portal to display the Portal
toolbar.
2. Click the Pin button . The button changes to Unpin.
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ENVI Tutorial: Working with ENVI Zoom
 Tutorial: Working with ENVI Zoom
3. Click the Pan button on the ENVI Zoom toolbar. Grab the true-color image (click outside of the Portal) and
drag it around in the Image window. Notice how the Portal stays fixed to the image.
4. Click the Select button on the ENVI Zoom toolbar to exit the Pan tool.
5. Click once inside the Portal to select it, then place your cursor at the top inside of the Portal to display the Portal
toolbar.
6. Click the Unpin button on the Portal toolbar.
Working with Blend, Flicker, and Swipe
ENVI Zoom provides tools that help you compare two different layers. You can use these tools for comparing entire
images or you can use them inside of a Portal, as you will do in this tutorial. These tools are enabled only when you have
two or more layers open in the Layer Manager, and when you display at least one layer in the Image window. For optimal
viewing when using these tools, it is recommended that you not use the transparency enhancement slider.
Blending
Blending allows you to gradually transition from one image to another, by increasing the transparency of one image.
1. Right-click inside of the Portal and select Blend. Blending automatically begins between the true color and CIR
layers.
2. Experiment with the speed of the blend, using the and buttons available on the Portal toolbar.
3. Click the Pause button on the Portal toolbar to stop the blend.
Flickering
Flickering allows you to toggle between two images at a desired speed.
1. Right-click inside of the Portal and select Flicker. Flickering automatically begins between the true color and CIR
layers.
2. Experiment with the speed of the flicker, using the and buttons available on the Portal toolbar.
3. Click the Pause button on the Portal toolbar to stop the flicker.
4. If you paused the flicker action while the true color image was displayed, your Portal will appear transparent.
Right-click in the Portal and select Load New Layer �! Raster 1: jsp99hym.eff.
Swiping
Swiping allows you to spatially transition from one image to another using a vertical dividing line that moves between two
images.
1. Right-click inside of the Portal and select Swipe. Swiping automatically begins between the between the true
color and CIR layers.
2. Experiment with the speed of the swipe, using the and buttons available on the Portal toolbar.
3. Click the Pause button on the Portal toolbar to stop the swipe.
To exit blend, flicker, or swipe, you must close the Portal, unless you want the Portal to appear in the screen capture you
will create in the next step.
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ENVI Tutorial: Working with ENVI Zoom
 Tutorial: Working with ENVI Zoom
Chipping and Saving
In this step, you will use Chip from Display to take a screen capture of the contents of the Image window, and save
the image. Any enhancements, zooming, rotating, or Portals that are displayed in the Image window are burned into the
output image. ENVI Zoom creates an 8-bit, three-band image at screen resolution.
1. Click the Chip from Display button on the ENVI Zoom toolbar. The Chip From Display Parameters dialog
appears.
2. From the Output File drop-down list, select JPEG.
3. Click the File Select button . The Select Output Filename dialog appears.
4. Browse to a preferred location on your hard drive, type zoomtutorial as the file name, and click Open.
5. Click OK on the Chip From Display Parameters dialog. ENVI Zoom adds the output file to the Data Manager,
where you can open and view the new JPEG image.
Resetting Preferences and Closing ENVI Zoom
1. From the menu bar, select File �! Preferences. The ENVI Zoom Preferences dialog appears.
2. Click the Restore Defaults button at the bottom of the dialog.
3. Click OK to save these preferences.
4. From the menu bar, select File �! Exit and click OK to exit ENVI Zoom.
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ENVI Tutorial: Working with ENVI Zoom [ Pobierz całość w formacie PDF ]