Uploading Grayscale images causes the image to be darkened

zogstrip · 30 Gennaio 2015, 3:44pm

We’re using both ImageMagick and ImageOptim to make sure thumbnails are as small as possible

app/models/optimized_image.rb

main


      
          
          lock(upload.id, width, height) do
            # may have been generated since we got the lock
            thumbnail = find_by(upload_id: upload.id, width: width, height: height, extension: extension)
          
            # return the previous thumbnail if any
            return thumbnail if thumbnail
          
            if original_path.blank?
              Rails.logger.error("Could not find file in the store located at url: #{upload.url}")
            else
              # create a temp file with the same extension as the original
          
              return nil if extension.length == 1
          
              temp_file = Tempfile.new(["discourse-thumbnail", extension])
              temp_path = temp_file.path
          
              target_quality =
                upload.target_image_quality(

This file has been truncated. show original

Not sure what’s causing the image to be darkened though

GIF: convert in.gif -coalesce -gravity center -thumbnail 100x100^ -extent 100x100 -layers optimize out.gif
OTHER: convert in.png[0] -background transparent -gravity center -thumbnail 100x100^ -extent 100x100 -interpolate bicubic -unsharp 2x0.5+0.7+0 -quality 98 out.png

Argomento		Risposte	Visualizzazioni
Uploading image makes it black (not darker!) Bug	13	3918	Aprile 3, 2015
"Failed to optimize image" error from discourse-topic-previews-sidecar Product Support	7	260	Luglio 30, 2026
Uploaded Emoji are a bit desaturated? Bug	7	2114	Agosto 4, 2015
Profile image appears darker on mobile Product Support	3	1219	Marzo 10, 2016
Gravatar pictures not displaying Product Support	17	1363	Settembre 14, 2018

Uploading Grayscale images causes the image to be darkened

Argomenti correlati