Final Image Sizes??

Changing the output quality of a course doesn't seem to change the size of the individual image files within the mobile folder -- they remain the same size regardless of if I publish at 100% or 50%. What is actually being compressed in Storyline to lower the overall size of the zipped package?

On average, how big are the image files in your courses upon publish?

11 Replies
Daniel Sposato (Philly)

Hey Ashley, not sure exactly what SL does but I'd imaging it lowers the pixel count on the pallet of the images.

Did you adjust your image compression with the Publish Quality settings? Clicking the Publish option and then under "Properties" toward the bottom click on "Custom optimization" next to Quality. The following image shows you the compression options you are presented with if using SL2:

Ashley Schwartau

Yes, regardless of what we select for Image Quality, the size of the images in the Mobile folder in the Output folder remain the same (seemingly full resolution). See the attached images -- one is from publishing the image quality on 10% and one is from publishing the image quality on 60%. Literally the same final image size. 



So I'm trying to understand how the image compression works and what is actually being made smaller, especially as we have clients complaining about the size of the images. (Now we have gone in and shrunken all of the images post-publish using and got them all down to under 500 kb but they are STILL saying the "huge" images are spiking bandwidth, so I'm trying to understand better how images are loaded in a course, how Storyline compresses images, etc.)

Alyssa Gomez

Hi Sally,

The reason you're seeing increased image sizes is because the resolution at which we publish PNG files has changed for the HTML5 player in Storyline 3 and Storyline 360.  We'd be happy to take a closer look at your file if you'd like us to compare the increased file size after publishing. You can send it straight to our Support team by clicking here!