ETM+ Yellow/Blue Filter
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Navigate the menu control again, "File-Open".
Navigate your hard drive again to the "BLUE" folder where you saved the "nn30.tif" file. Recall that this is actually the "RED" image, but we are processing it as "BLUE" for this filter. Because the color filtering system for this method is backwards. For the third step in this tutorial you will be processing the color system forward, which will give us a second sampling set that we can mix with the results of this method to give us a more realistic color expression. You will understand as you get further into this tutorial.
Select the image and click the "Open" button.
Click on the image for a larger view.
After the image loads you will see an image similar to the one below. Note again that the brightness of the image is significantly less. This is because this is the "RED" image, not the "BLUE", but again we are processing it backwards for the purposes of true color expression.
Press "Ctrl A" on the keyboard to select the entire image.
Press "Ctrl C" on the keyboard to copy the entire selection to the clipboard. i.e. the entire image.
Click on the image for a larger view.
Switch the image you have been pasting all these image into, the one you created as new a few pages back.
Press "Ctrl V" on the keyboard to paste the entire clipboard as a new layer into this image.
Right click on the new layer name shown here as "Layer 1". You'll get another familiar popup menu. Navigate to "Layer Properties" and click on it.
You will get a dialog box like the one shown in the image below.
Change the name to "BLUE" to represent the color here, even though it really should be "RED", but again we are processing it backwards so "BLUE" is an appropriate name.
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