JPEG to TIFF using minimagick

Question

I wanted to convert my jpeg image to a tiff image with some criteria, all the factor is met but I am not able to figure out how to decrease the size, currently, the image is becoming 1.2MB after conversion, I want to decrease it to less than or equal 100kb with resolution of 200 dpi. The original jpeg image is 250kb with 456 X 679.

How to do it?

require 'mini_magick'

class FileConversionService

  def self.to_tiff
    input_path = "/images/1.jpg"
    image = MiniMagick::Image.open(input_path)
    k = image.format("tiff")
    k.write("/images/1_tiff")
    tiff_path = "/images/1_tiff"
    image_data = MiniMagick::Tool::Convert.new do |img|
        img << tiff_path
      img << '-resize' << "1600x734"
      img << '-colorspace' << "scRGB"
      img << '-density' << "700"
      img << '-background' << "white"
      img << '-verbose'
      img << tiff_path
    end
  end

end

FileConversionService.to_tiff

Answer 1

You can add -compress option with ZIP or LZW option to enable compression for the TIFF. But for most images TIFF will be bigger than JPEG. An in addition you specified the resize option, which upscales your image to 979x734, making it a bigger image.

As additional comment, your current code converts twice, one time via

input_path = "/images/1.jpg"
image = MiniMagick::Image.open(input_path)
k = image.format("tiff")
k.write("/images/1_tiff")
tiff_path = "/images/1_tiff"

which opens the jpg and writes the tiff and the second time doing

image_data = MiniMagick::Tool::Convert.new do |img|
    img << tiff_path
  img << '-resize' << "1600x734"
  img << '-colorspace' << "scRGB"
  img << '-density' << "700"
  img << '-background' << "white"
  img << '-verbose'
  img << tiff_path
end

which reopens the tiff file, adjusts it to the defined parameters and then outputs it again to tiff_path. This can be done in one go using only convert:

input_path = "/images/1.jpg"
tiff_path = "/images/1.tiff"
MiniMagick::Tool::Convert.new do |img|
  img << input_path
  img << '-compress' << 'ZIP'      
  img << '-resize' << "1600x734"
  img << '-colorspace' << "scRGB"
  img << '-density' << "700"
  img << '-background' << "white"
  img << tiff_path
end