如何从RMagick或Chunky_PNG中的每个像素获取十六进制值？ [英] How do I get the hex value from each pixel in RMagick or Chunky_PNG?

问题描述

我试图使用 RMagick 或 Chunky_PNG 来读取每个像素的值，如十六进制（HTML表示法）例如＃5DBCD2 。目前我有下面哪种做我想要的，但我找不到正确的方式来实际读取十六进制值。我宁愿使用 Chunky_PNG ，谢谢！

  require' chunky_png'
 
 img = ChunkyPNG :: Image.from_file（image.png）
 
 height = img.dimension.height 
 width = img.dimension。宽度
 
 height.times do | i | 
 width.times do | j | 
p [ChunkyPNG :: Color.r（img [j，i]），ChunkyPNG :: Color.g（img [j，i]），ChunkyPNG :: Color.b（img [j，i]）] 
 end 
 end 
  

OR

  require'RMagick'
 include Magick 
 
 image = ImageList.new（image.png）
（0 ..image.columns）.each do | x | 
（0..image.rows）.each do | y | 
 pixel = image.pixel_color（x，y）
p [pixel.red，pixel.green，pixel.blue] 
 end 
 end 
 
解决方案
 $ b 
解决方案

一些hacky解决方案，但它应该做的伎俩。

  require'chunky_png'
 
 img = ChunkyPNG :: Image.from_file（image.png）
 
 height = img.dimension.height 
 width = img.dimension.width 
 
 height.times do | i | 
 width.times do | j | 
 arr = [ChunkyPNG :: Color.r（img [j，i]），ChunkyPNG :: Color.g（img [j，i]），ChunkyPNG :: Color.b（img [j，i] ）] 
p\ ## {arr.map {| x | x.to_s（16）.rjust（2，'0'）}。join.upcase}
 end 
结束
  

例如，您想要[204，102，0]的值（转换为＃cc6600 ）你可以使用下面的代码。

 \＃ ＃{[204,102,0] .map {| x | x.to_s（16）.rjust（2，'0'）}。join.upcase}
 => ＃CC6600
  

分解 .to_s（16）如果字符串不匹配2个字符，code>将整数转换为十六进制格式， .rjust（2，'0'） prepends'0'。 / p>



希望这有助于。

I'm trying to read the value of each pixel as hex (HTML notation) using RMagick or Chunky_PNG e.g. #5DBCD2. At the moment I have the below which kind of does what I want but I couldn't find the right way to actually read the hex value. I'd prefer to use Chunky_PNG though, thanks!

require 'chunky_png'

img = ChunkyPNG::Image.from_file("image.png")

height = img.dimension.height
width  = img.dimension.width

height.times do |i|
  width.times do |j|
    p [ChunkyPNG::Color.r(img[j,i]), ChunkyPNG::Color.g(img[j,i]), ChunkyPNG::Color.b(img[j,i])]
  end
end

OR

require 'RMagick'
include Magick

image = ImageList.new("image.png")
(0..image.columns).each do |x|
  (0..image.rows).each do |y|
    pixel = image.pixel_color(x, y)
    p [pixel.red, pixel.green, pixel.blue]
  end
end

解决方案

A bit of a hacky solution but it should do the trick.

require 'chunky_png'

img = ChunkyPNG::Image.from_file("image.png")

height = img.dimension.height
width  = img.dimension.width

height.times do |i|
  width.times do |j|
    arr = [ChunkyPNG::Color.r(img[j,i]), ChunkyPNG::Color.g(img[j,i]), ChunkyPNG::Color.b(img[j,i])]
    p "\##{arr.map {|x| x.to_s(16).rjust(2, '0')}.join.upcase}"
  end
end

Say for example you want the value of [204, 102, 0] (which translates to #cc6600) you could use the following code.

"\##{[204, 102, 0].map {|x| x.to_s(16).rjust(2, '0')}.join.upcase}"
=> "#CC6600"

To break it down .to_s(16) converts an integer to hexadecimal format and .rjust(2, '0') prepends '0' if the string does not match 2 characters in length.

Hope this helps.

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