McIDAS Learning Guide
Version 2006
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GUI - Modifying Image and Graphics Colors
In this exercise, you will display an infrared image over the United States from
the Blizzard dataset, restore the default enhancement, and modify the image and
graphics colors.
- Display the 18:01:00 UTC infrared satellite image from 13
MAR 1993 on the current frame. Display a map on the image.
- In the Display/Image GUI, select: the BLIZZARD/G7-IR-4K
dataset, and to display a map on the
image.
- Select the 18:01:00 UTC image from
the image list, load the image, and dismiss the Image Select window.
- Obviously, these colors are not the colors of a normal infrared
image. Even though the frames were erased, the NEXRAD enhancement is still
assigned to that frame. So, you'll need to restore the correct colors by
modifying the Image Colors.
- Select: Colors/Change Image Colors
- Click: the Reset tab
The default option in the Reset tab is to reset the current frame only.
- Click: Reset
- Activate the GUI where you'll create your own enhancement.
- Click: Make
The Make tab of the Image Colors GUI contains four options
in which you can change or create image colors: 'Using Color Names,' 'Using
Color Intensities,' 'Using ENH,' and 'Using EB.'
- The 'Using Color Names' button consists of two scroll
bars labeled 'Begin' and 'End.' The scroll bars allow you to select a
beginning and ending color from one of the 35 predefined McIDAS colors.
- The 'Using Color Intensities' button also has the two
scroll bars, but allows you to choose the exact amount of red, green,
and blue intensities to create your own colors.
- The 'Using ENH' button is a graphical way to change
the intensities of red, green, and blue.
- The 'Using EB' button starts the EB command which invokes
the interactive mouse-controlled contrast stretching. Press the right
mouse button to end the process, leaving the current enhancement.
Start out by using the predefined McIDAS colors.
- Click: Using Color Names
- Use the predefined color 'Blue' to begin at a grayscale
of 145, and 'Goldenrod' to end at a grayscale of 210.
- Slide: the Begin scrollbar to 145.
- Slide: the End scrollbar to 210.
- Select: Beginning Color/Blue
- Select: Ending Color/Goldenrod
- Click: Apply Enhancement
Look at the Image window. You should see that all brightness
values from 145 to 210 are colored from Blue to Goldenrod, depending on
the specific value. All other brightness values will remain in their original
grayscale form.
-
Repeat Step 4 several times, changing the colors and input
values each time.
- Once you have finished altering the image colors, dismiss
the color selection GUI and save the enhancement as LEARNING.ET.
- Click: Dismiss
- Click: Save
- Type: LEARNING
- Click: Save
- Reset the original image enhancement and restore LEARNING.ET
to the image once again.
- Click: Restore
- Select: Select Enhancement File/LEARNING.ET
- Click: Restore
- Restore the original image enhancement.
- Click: Reset
- Select: Frame Selection/Set for Current Loop
- Click: Reset
- Click: Dismiss
- Change the color of the map in frame 4.
- Select: Colors/Change Graphic Colors
- Click: Create a New Color
- Slide: the Red, Green, and Blue Intensity bars until
you've created a color you like.
- Click: Apply Enhancement
- Click: Dismiss
Look at the image window, and you will notice the changes to graphic color
1 took effect immediately.
- Save the new graphics table as LEARNING.GRX.
- Click: Save
- Type: LEARNING in the File
Name field
- Click: Save
- Restore the default graphics colors.
- Click: Reset
- Select: Frame Selection/Current Frame Only
- Click: Reset
- Close the Graphics Colors window.
- Click: Dismiss
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