How storyline handle jpeg compression?

Hi

I am trying to figure out how to optimize the jpeg in storyline. 

Normally I would optimize the jpeg file before importing into storyline, however I found out the published file is bigger than the original file. 

Apparently Storyline has done something about the compression, could someone tell me how this compression is handled, and what's the best to optimize jpeg files.

Thank you

9 Replies
Ken Liu

Peter Anderson said:

Hi Ken!

Have you had a chance to experiment with the image quality in the publish dialog


Yes, I have a lot of tests, and noticed that even I set the quality to 100% (JPEG), the published file wouldn't be smaller than the original file I have imported. Any better idea of how the compression is handled in Storyline?

Sabre Training

I know this is an old thread, but I'm really underwhelmed by the compression algorithm used in Storyline.  If you publish for the web, even if you set the image quality to 100%, it's beyond bad.  Large areas of pixel artifacts, odd color shifts, etc.  I've experimented with jpeg compression settings in Photoshop to see where Storyline is, and I think Storyline publishes at about a 30 out of 100, in terms of the PS compression quality when Storyline's compression is set to 100%.  That's low to the point of 1990's image quality.

I think if you set quality to 100%, it should be uncompressed.  Period.  Let the user control whether they want to publish large image files.

Peter Anderson

Thanks for the feedback, Mark. 

I'm seeing a lot of feature requests come in asking for an option to choose whether or not you want Storyline to compress media, like images and videos. 

If that's something you'd like to see, I'd encourage you to reach out directly to our development team and explain why it's important to you. 

We really appreciate the input. 

Thanks, Mark!

Mark Ramsey

My question is: If you bring in a JPG graphic that is already compressed to a Storyline project, when publishing will Storyline:

  • read the compression of the graphic and render it at the original compression setting,
  • override the original compression setting, and use the compression (image Quality) setting in the publishing dialog box, or
  • compress the already compressed JPG graphic again?

I know the best image quality is to bring in a sized uncompressed graphic format like a 24-bit PNG, and then set the image quality in the publishing dialog box to at least 80%. The thing is, many graphics we receive, especially photographs, are JPGs, with various degrees of compression. So it would be great if I knew how Storyline handles these in a standard Flash-based publishing scenario. 

Ashley Terwilliger

Hi Mark,

Great question - and I'd say it's  the latter - compress the already compressed JPG. Storyline's focus is on creating the smallest possible file, at the best possible output - so it's only working with what you've included and the settings you choose - not referring to previous compression settings used elsewhere.