Greetings @zekepickleman ,
Very kind of you to drop by with this lovely comment.
AI probably already can do it. ^__^
Yes...in traditional watercolour in order to have white, one must leave the white of the paper...and I just now realised in answering your comment that I had not addressed that aspect at all...that is the challenge of it.
Training in the fine arts usually does not allow the students to use any other photography other than their own as subject matter as you are more familiar with the data the subject provides.....of course that cannot always be the case....however it is splendid when it works out in that way, as you noticed.
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Kind Regards,
Bleujay