This was a great exercise, Greg! The video hint was MOST helpful. I didn't know whether I should post the image, because if it worked, it worked, but I am. Didn't paint out the purple dots in the grass, but tried it and it is fine.
Have been working on a large landscaping project against a deadline of weather getting cold. I'm still here if you are!
Rhonda
Rhonda Dog wearing Purple Coat
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Photoshop has in some ways caught up to CM in that you can now; as of CS4 make selections as a mask from the image. When CM Version 3 was first released PSCS3 Masking was a tough nut to crack and few people could make effective masks. CM was a real life saver; today the tools are a bit better...still confusing but better..
When you copy the channel in CM you are making a copy of the channel on the clipboard of windows. You can paste the channel back as an alpha channel if you want or you can make the image a mask on a layer. As for when to copy a channel or when to create a mask I think time and experience as well as what workflow makes the most sense will be some of the stronger factors for you. One simple way to start looking at channels is to make a background copy, adjust the channels in PS or using CM and apply them as a Luminosity layer.
This is such a deep end of the pool...
Greg
When you copy the channel in CM you are making a copy of the channel on the clipboard of windows. You can paste the channel back as an alpha channel if you want or you can make the image a mask on a layer. As for when to copy a channel or when to create a mask I think time and experience as well as what workflow makes the most sense will be some of the stronger factors for you. One simple way to start looking at channels is to make a background copy, adjust the channels in PS or using CM and apply them as a Luminosity layer.
This is such a deep end of the pool...
Greg
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