create a new "layer" the same size as the original with clone and fill black

[Bonzo]

I have seen this done but I can not remember how to do it. To create a mask with with a canvas the same size as the original something like:

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convert input +clone -background black -fill white -draw "roundRectangle 50,0 200,300 10,10" -composite output

[fmw42]

clones must be enclosed in parenthesis. I am not sure what your command is trying to do. Can you explain what you want to do in a bit more detail. What kind of mask do you want? If some solid color, then

\( +clone -fill somecolor -colorize 100% \)

[Bonzo]

That is what I was looking for thank you fmw42. It is just the start of something I am trying out:

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convert input -resize x300 ( +clone -fill white -colorize 100% -fill black -draw "roundRectangle 50,0 200,300 10,10" ) -composite output

I was looking to create a mask to isolate an area in the middle of an image.

[snibgo]

As Fred says, however, "-colorize" takes numbers that are already percentages. The syntax doesn't require a % percent sign. See http://www.imagemagick.org/script/comma ... p#colorize

[Bonzo]

Yes as you say snibgo using -colorize 100 works as well