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RSpec.describe Magick::Image, "#channel_mean" do
it "returns the mean and std. dev for the RedChannel" do
image = build_image
mean_and_stddev = image.channel_mean(Magick::RedChannel)
expected_stddev = value_by_version(
"6.8": 100.1757830016816,
"6.9": 115.6730305646048,
"7.0": 115.6730305646048,
"7.1": 115.6730305646048
)
expect(mean_and_stddev[0]).to be_within(0.0000001).of(125.25)
expect(mean_and_stddev[1]).to be_within(0.0000001).of(expected_stddev)
end
it "returns the mean and std. dev for the GreenChannel" do
image = build_image
mean_and_stddev = image.channel_mean(Magick::GreenChannel)
expected_stddev = value_by_version(
"6.8": 66.22122016393234,
"6.9": 76.46567857542362,
"7.0": 76.46567857542362,
"7.1": 76.46567857542362
)
expect(mean_and_stddev[0]).to be_within(0.0000001).of(142.5)
expect(mean_and_stddev[1]).to be_within(0.0000001).of(expected_stddev)
end
it "returns the mean and std. dev for the RedChannel and GreenChannel" do
image = build_image
mean_and_stddev = image.channel_mean(Magick::RedChannel, Magick::GreenChannel)
expected_stddev = value_by_version(
"6.8": 84.91300695417634,
"6.9": 96.06935457001421,
"7.0": 96.06935457001421,
"7.1": 96.06935457001421
)
expect(mean_and_stddev[0]).to be_within(0.0000001).of(133.875)
expect(mean_and_stddev[1]).to be_within(0.0000001).of(expected_stddev)
end
it "returns the mean and std. dev for all channels when no arguments are passed" do
image = build_image
mean_and_stddev = image.channel_mean
expected_stddev = value_by_version(
"6.8": 91.23584365076407,
"6.9": 103.58337316538109,
"7.0": 103.58337316538109,
"7.1": 103.58337316538109
)
expect(mean_and_stddev[0]).to be_within(0.0000001).of(123.91666666666667)
expect(mean_and_stddev[1]).to be_within(0.0000001).of(expected_stddev)
end
it "raises an error when the wrong type of argument is passed" do
image = build_image
expect { image.channel_mean("blue") }
.to raise_error(TypeError, "argument must be a ChannelType value (String given)")
end
end
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