adjust compression

lib/templates/process_document.rb

@@ -69,7 +69,7 @@ module Templates
 
       bitdepth = 2**image.stats.to_a[1..3].pluck(2).uniq.size
 
-      io = StringIO.new(image.write_to_buffer(FORMAT, compression: 7, filter: 0, bitdepth:,
+      io = StringIO.new(image.write_to_buffer(FORMAT, compression: 6, filter: 0, bitdepth:,
                                                       palette: true, Q: Q, dither: 0))
 
       ActiveStorage::Attachment.create!(
@@ -141,7 +141,7 @@ module Templates
         if format == FORMAT
           bitdepth = 2**page.stats.to_a[1..3].pluck(2).uniq.size
 
-          page.write_to_buffer(format, compression: 7, filter: 0, bitdepth:,
+          page.write_to_buffer(format, compression: 6, filter: 0, bitdepth:,
                                        palette: true, Q: Q, dither: 0)
         else
           page.write_to_buffer(format, interlace: true, Q: JPEG_Q)