PDF to JPG conversion using Rails 5, Paperclip. Improved resolution of output

gistfile1.txt

#Accepts all image files and pdfs. If the upload is a pdf, it is converted to a jpg
#Paperclip incorporates ImageMagick. If a multipage page PDF, only the first page is converted

#Model
#here the original style needs to be given source_file_options. It's critical that the original file is not passed geometry
#or the resolution won't really improve

has_attached_file :avatar,
	styles: lambda { |attachment|
		styles = {}
		if attachment.content_type =~ /application.pdf/
			styles[:thumb] = {
				geometry: "800x800#",
				format: :jpg
			}
			styles[:medium] = {
				geometry: "1920x1920>",
				format: :jpg
			}
			styles[:original] = {
				format: :jpg,
				source_file_options: lambda { |a| "-quality 100 -density 400" }
			}
		else
			styles = {thumb: "800x800#", drawingboard: "1920x1920>"}
		end
		styles
	}
	
#model validation
validates_attachment_content_type :drawingboard_image, content_type: [/\Aimage\/.*\z/, 'application/pdf']
	
#in Paperclip initializer
#Prevent paperclip spoof settings from breaking file conversion
Paperclip.options[:content_type_mappings] = { pdf: "image/jpeg" }
	

Great!