I wanted to replace rmagick with ruby-vips as it's claimed that rmagick have large memory footprint and that ruby-vips is faster.
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It's was hard to figure only by reading the API documentation that I had to use black and draw_point methods. Especially for black, I expected a new(w,h) method for Vips::Image like there are new_from_xxx methods.
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The draw_point is a special case of draw_rect (virtually declared). It's said that the parameter ink is the Color for pixels of type Array<Double>. By finding a example on internet I saw either a RGB array or RGBA array. There is no more information in the doc of what "ink" is and which format is expected. By providing an RGB array the resulting image is black and white instead of the orange and blue colors provided.
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The README claims that ruby-vips is way faster than rmagick but looking at a becnhmark, rmagick generate the image in 0.04 sec and ruby-vips in more than 21 sec. Am I doing something wrong?
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On rmagick the methods are applying the the object directly, on ruby-vips all methods returns an object so we have to do obj = obj.method as there is no obj.method! self applying methods. This is less convenient to write and I'm wondering if all the object copies are the reason ruby-vips is slower, because it is generating 10000 images instead of modifying 10000 pixels of one image.
require 'rmagick'
require 'vips'
require 'benchmark'
data = (0..10000).map {|_i| rand(2) }
width = 100
height = 100
Benchmark.bm do |x|
x.report {
img = Magick::Image.new(width, height)
i = 0
(0...width).each do |x|
(0...height).each do |y|
# orange (0)
img.pixel_color(x, y, "rgb(255,66,14)")
# blue (1)
img.pixel_color(x, y, "rgb(0,69,134)") if data[i] == true or data[i] == 1
i+=1
end
end
img.write('pixel.png')
}
x.report {
im = Vips::Image.black(width, height)
i = 0
(0...width).each do |x|
(0...height).each do |y|
# orange (0)
im = im.draw_point([255,66,14], x, y)
# blue (1)
im = im.draw_point([0,69,134], x, y) if data[i] == true or data[i] == 1
i+=1
end
end
im.write_to_file('pixel.png')
}
end$ ruby poc.rb
user system total real
0.046996 0.000009 0.047005 ( 0.056036)
21.284349 3.246679 24.531028 ( 23.375003)
Is there a better way to do it with new_from_array ?
Versions
ffi 1.12.2
ruby-vips 2.0.17
rmagick 4.1.1
imagemagick 7.0.10.6
libvips 8.9.0
I wanted to replace rmagick with ruby-vips as it's claimed that rmagick have large memory footprint and that ruby-vips is faster.
It's was hard to figure only by reading the API documentation that I had to use
blackanddraw_pointmethods. Especially forblack, I expected anew(w,h)method forVips::Imagelike there arenew_from_xxxmethods.The
draw_pointis a special case of draw_rect (virtually declared). It's said that the parameterinkis the Color for pixels of typeArray<Double>. By finding a example on internet I saw either a RGB array or RGBA array. There is no more information in the doc of what "ink" is and which format is expected. By providing an RGB array the resulting image is black and white instead of the orange and blue colors provided.The README claims that ruby-vips is way faster than rmagick but looking at a becnhmark, rmagick generate the image in 0.04 sec and ruby-vips in more than 21 sec. Am I doing something wrong?
On rmagick the methods are applying the the object directly, on ruby-vips all methods returns an object so we have to do
obj = obj.methodas there is noobj.method!self applying methods. This is less convenient to write and I'm wondering if all the object copies are the reason ruby-vips is slower, because it is generating 10000 images instead of modifying 10000 pixels of one image.Is there a better way to do it with
new_from_array?Versions