Color gamout from imported JPEG,PNG and PSD

Hi,
I made an animation on HTML5 canvas with background as imported 3 layered PSD image.
Some colors get dotted when I test my work in browser as HTML.
On stage, exported mp4, JPEG and PNG everything is fine with imported background.
Do you know what is the problem?
I have tried in library menu/bitmap properties to fix things with changing from jpeg to png/gif compression, but it made small difference. Later on in the process it also become like jpeg compression.
Note that I can't use actionscript for this project since it makes issues in HTML.