Image Compression

Me again. I'm having an issue with the size of some of my slides in my published course. When the client loads the course on their LMS, several slides freeze. I know it's because they have very, VERY limited bandwidth, so I'm doing what I can on my end to compress the size of the images in the course.

On one slide in particular, there are 11 PNGs that I have tried to compress, then even reinserted as JPGs (and compressed again). I tried saving the pictures out as multiple file types (PNG, JPG, TIFF, etc.), but JPG appeared to be the smallest. Still, when I publish the course, the .swf file tells me that the slide is still over 6 MB. 

Any other suggestions for how to compress these images?

5 Replies
Ashley Terwilliger-Pollard

Hi Brandon,

Yes, it's a publish setting - so it will impact your whole course. Did you review Antony's suggestion in this thread?  Possibly others in the community have suggestions on how to reduce the overall size of images - but those were my best thoughts based on what I've seen here.

Timothy lee

If we can compress image without affecting the quailty of original document, then we had better to choose image lossless compression. You mentioned jpeg compression, yes, JPEG compressing software is based on Wavelets, it is able to present images at different resolution and sizes. That is to say you can display full size, full resolution or half size. And Jpeg compression gives the smallest image size.  As far as I am concerned, you may also try jbig2 compression that is popular for many users. It supports lossy and lossless image compression modes. You can try to save your slides into both image forms and compare which one is smaller.