Here's a technique I just found out about. It's a little time consuming, but there is a *LOT* of control.
1. Open a color image, and make a duplicate copy. Image/Duplicate -- O.K.
2. On the duplicate image, choose Image/Mode/Grayscale
3. Target the original image, choose Image/Adjust/Channel Mixer. Choose 100% red, 0% green and blue -- monochrome -- O.K.
4. Holding down the shift key, drag the resulting grayscale image onto the grayscale image you made earlier. This will line up your newly dragged layer with the layer below.
5. Target your original image, Window/Show History. Click on the top history state (the opening of the image). Repeat step 3, except choose 100% green, 0% red and blue -- again monochrome -- O.K.
6. Repeat step 4.
7. If you think there is sufficient data in the blue channel, repeat step 5, but choose 100% blue, 0% red and green -- again monochrome -- O.K.
8. Repeat step 4.
This will give you a grayscale image with 2 or 3 layers from the images you dragged over from the original image. You can name these layers "red layer", "green layer", and "blue layer". Now that you have the information from the original channels, you can use layer masks, opacity settings, and blending modes to spend your day making your grayscale image exactly the way you want it
. You also have the option to change layer positions, resulting in a different look. Have fun.
Ed
1. Open a color image, and make a duplicate copy. Image/Duplicate -- O.K.
2. On the duplicate image, choose Image/Mode/Grayscale
3. Target the original image, choose Image/Adjust/Channel Mixer. Choose 100% red, 0% green and blue -- monochrome -- O.K.
4. Holding down the shift key, drag the resulting grayscale image onto the grayscale image you made earlier. This will line up your newly dragged layer with the layer below.
5. Target your original image, Window/Show History. Click on the top history state (the opening of the image). Repeat step 3, except choose 100% green, 0% red and blue -- again monochrome -- O.K.
6. Repeat step 4.
7. If you think there is sufficient data in the blue channel, repeat step 5, but choose 100% blue, 0% red and green -- again monochrome -- O.K.
8. Repeat step 4.
This will give you a grayscale image with 2 or 3 layers from the images you dragged over from the original image. You can name these layers "red layer", "green layer", and "blue layer". Now that you have the information from the original channels, you can use layer masks, opacity settings, and blending modes to spend your day making your grayscale image exactly the way you want it

Ed
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