Trees seem to be a very popular masking subject. All of the branches and leaves on trees typically make it a little harder to mask, so the workflow for masking (most) trees will be a little different from the standard workflow that you see us use on other images. The difference in the workflow is during the tri-map creation. While we will still use all three colors (red, green and blue) we will actually be switching up the way that we create the tri-map. This process requires a little more time and user input but it will allow you to get the best possible results.
Instead of starting with Green (to keep), which is automatically applied when you launch ReMask, we will start with Blue. So, one your image is open in ReMask click on the Blue Reset button. This will fill the image with blue, then we’ll just need to add the Green and Red selections – using the Green and Red Single Color Selection tools. Once you click on the Green Single Color Selection tool it will automatically activate the eyedropper so that you can make a color selection. You can also adjust the color range sliderto determine the range of the selected color that will be affected in the image.
The brush size can be adjusted if necessary. Selecting a larger brush size will affect more area at a time during each brush stroke. When you brush over your image, it will select add those colors to the Green (keep) portion of your tri-map. We can repeat this process as many times as necessary to make sure that there is a good selection of colors sampled. Once the Green selections are made, we can move over to the Red Single Color Selection Brush and repeat the steps for the colors (background in this case) that we want to remove. After we have the Green and Red selections made we can click Compute to process the tri-map. Once we have the processed mask you can use your regular refinement workflow to clean up any areas in your image.
Here are some additional workflow tips to help you:
1. I suggest going to your mask view to help identify areas in between branches and leaves for cleanup. If you notice light gray (or “murky”) areas in between your solid white and solid black mask then you can use the Magic Brush tool to clean this up.
2. You can still use the Single Color Brushes to select colors for clean up and then brush over those areas – keep the magic brush checkbox enabled.
3. If you find an area that is particularly hard to tackle (and you’ve already tried the Single or Dual color Selection tools) then go ahead and select the blue brush and brush over that area. Doing this will recompute the brushed area and adjust your mask according the the red and green selections you’ve made collectively…cleaning up any unwanted colors.
4. Use your Recovery slider (must be in keep view).