This also works:
convert rose: -type Grayscale -fx "u==rgb(255,255,255)?debug(u):1; u" null:
so I suppose you should be able to do (or any other rgb(r,g,b) combination:
convert rose: -fx "u==rgb(255,255,255)?debug(u):1; u" null:
currently I have reported a bug (IM 6.4.0-6) that is giving bad
values for -verbose info: on the rose: image
convert rose: -verbose info:
Image: rose:
...
Channel statistics:
red:
min: 8995.5 (0.137263)
max: 65535.5 (1.00001)
mean: 37448.5 (0.571428)
standard deviation: 17808.9 (0.271746)
green:
min: 5654.5 (0.0862821)
max: 65535.5 (1.00001)
mean: 22940.4 (0.350048)
standard deviation: 13484.7 (0.205764)
blue:
min: 6168.5 (0.0941253)
max: 65535.5 (1.00001)
mean: 20680.9 (0.31557)
standard deviation: 14163.6 (0.216123)
where the max is larger than 1.0. thus this does not seem to work
without first converting to grayscale.
Hopefully this will be fixed shortly.
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