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One of the uses of the Threshold Adjustment Layer is to isolate the tones in an image. I use it to find the black, white and middle gray points of most of the images you find on the blog. On the Threshold Adjustment Layer, pulling the cursor all the way to the left and "walking" it back up (highlighting the numeric value of zero and using the up arrow key)assists in finding the earliest instance of an "important" black. All the way right and counting down allows us to find the first instance of an "important" white. Producing a new layer, under the Threshold Adjustment Layer (CTRL "New Layer" Icon), filling it with 50% grey (Shift F5 and select 50% gray) and changing the Blend Mode to Difference gives us a middle gray at the far left end of the Threshold graph. Use the Color Sample Tool (Shift I until you get the eye dropper with the target) to set the black, white and middle gray points. That would be how you would neutralize any color cast in a typical image.
You might think this would be the way to produce today's image. Unfortunately, it's not. Because the Threshold Adjustment picks only black and white we wouldn't get the gray scale you see in the mast. Instead, a Layers Adjustment Layer was employed to reduce everything to black, white and a bit of gray. Playing with the sliders until we were almost there. Then the same "trick" we've been discussing about switching skies was used. With a white Background Layer, the Blend Mode was changed to Darker Color and everything cleaned up very well.
To get the red in the flag, another layer was added and the, now black, stripes painted red. A high level of zoom was used to focus on the flag and a very small paint brush used to cover the stripes.
Sometimes you have to use your knowledge of Adjustment Layers and pick up that might not be your first thought. It's like Bert Monroy likes to say, "just play, it's the best way to learn".
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