Image optimization for iPad

Hi, what is the best practice as far as having high quality images on the iPad mobile app?

I have noticed that some images which appear very crisp in a browser looks pixellated or fuzzy on the iPad. Does it work best with PNG, JPG, etc.? And is it better to import them at full size and resize in Storyline, or to resize in photoshop?

I know that images are exported and compressed in various formats such as JPG, SWF and PNG...is there a guide somewhere as to how images are treated differently based on original format and the various outputs (flash, HTML5, AMP...)? 

Many thanks!

9 Replies
Leslie McKerchie

Hi P Y! I cannot think of specific documentation in regards to this. If you are having difficulty with something, we would want to take a look. I've seen documentation about zoom regions in AMP that states images aren't vectored as well, so seems like it would be similar to the HTML5 quality output.

Steve VE

P-Y:

Fuzzy images on the iPad

This is likely happening because the output is being resized automatically. It doesn't matter if it's Flash or HTML5. If you are using a raster image (PNG, GIF, JPG) then it will look fuzzy when resized.

One other issue you may be encountering is the retina display on the iPad (if it has one). Retina displays have 4 times as many pixels as "normal" displays so images can become fuzzy. There is a discussion about this and the workaround here.

Formats and output

From what I can tell, WMFs will retain their vector properties and can be resized without becoming fuzzy. More in WMFs in Storyline here. Other formats are converted to raster when imported into Storyline. A raster image will not be converted to a vector on publish no matter what format is published to.

But I believe that shapes you create inside Storyline and the cartoon characters will be rendered as vectors in the output.

Hope this helps.

P-Y Beaulieu

Hi Steve, I already have spent a couple of hours trying everything from the "importing vector graphics" thread and I can't manage it. For instance, I have imported the Charlene graphic, blown it up and attached is a screenshot from the result...

But from what I gather, this is not relevant to the iPad issue as it is not using vectors...is that correct?

Thx