Combining options in MiniMagick

问题

I'm trying out MiniMagick for some image manipulation but I'm having trouble combining commands. I want to use the trim command with a fuzz factor.

Calling

image.fuzz "30%"
image.trim

works perfectly. But my understanding is that the fuzz factor will continue to be set for all future commands, which I don't want. Instead I've tried

image.combine_options do |c|
  c.fuzz "30%"
  c.trim
end

but unfortunately this doesn't seem to do anything (unless I set the fuzz factor to 100% in which case it correctly removes every pixel from the image—fuzz at 99%, however, does nothing).

What am I doing wrong? Many thanks in advance!

回答1:

Ah, I forgot to add the +repage option to trim. This works:

image.combine_options do |c|
  c.fuzz "30%"
  c.trim "+repage"
end

来源：https://stackoverflow.com/questions/17754313/combining-options-in-minimagick