Dynamic color extraction from images

#1

Hello there,

I want to extract the dominant color from an array of images. I’ve tried several formulas with no success and at this point I found a gem called Miro, but it seems I’m missing something. I’ve bundled it to my project and then I defined a helper method in my config.rb:

def dom_colr(img)
	Miro.options[:color_count] = 1
	Miro.options[:method] = 'histogram'
	colors = Miro::DominantColors.new('img')
end

In my html.erb I made a loop that looks like this:

<ul class="list--thumbs">
	<% data['works']['images'].each_with_index do |s| %>
	<li class="item--thumb" style="background-color: <%= dom_colr(s) %>;">
		<% link_to(s, {:class=>'thumb__link', :target=>'_blank'}) do %>
			<%= image_tag(s, {:class=>'thumb__img', :resize_to=>'360x360'}) %>
		<% end %>
	</li>
	<% end %>
</ul>

The result my browser prints is something like this:

<li class="item--thumb" style="background-color: #<Miro::DominantColors:0x007fdc5d571368>;">

I’m new to Ruby and my lack of basic knowledge is mirrored in the above, but I would apreciate any kind of help.
Thanks in advance!

#2

Try

def dom_colr(img)
	Miro.options[:color_count] = 1
	Miro.options[:method] = 'histogram'
	miro_object = Miro::DominantColors.new('img')
	colors = miro_object.to_hex
	dominant_color = colors.first
	dominant_color   # return
end
#3

Unfortunately, after uncountable attempts I get a majestic “No such file or directory @ rb_sysopen - /directory/of/my/awesome/image.jpg”. Maybe an ImageMagick/RMagick issue?