Sam, 
just use PNG for all purposes. It's compressed but lossless, and it's supported 
by LyX as well as all modern web browsers.
Jens
 
On May 31, 2011, at 12:50 PM, Sam Lewis wrote:

> Thanks for your quick reply. 
> 
> I intent to both print it and distribute it online. I guess two versions of 
> the document might be useful.  What lossy format, would you recommend for the 
> latter?
> 
> Cheers, Sam
> 
> 
> 
> ----- Original Message -----
>> From: Rob Oakes <lyx-de...@oak-tree.us>
>> To: Sam Lewis <stroboscopicallyconflu...@yahoo.co.uk>
>> Cc: lyx-users@lists.lyx.org
>> Sent: Tuesday, 31 May 2011, 20:22
>> Subject: Re: Most suitable image format
>> 
>> It actually depends on how you intend to use the resulting document. If you 
>> will 
>> be printing the resulting PDF on a professional press, then you will want to 
>> use 
>> a lossless format (most likely tiff), or a high quality jpeg.  
>> 
>> If the PDF is to be put on your website, you will probably want to use a 
>> lossy 
>> format of some type. It will give a better quality to file size ratio, even 
>> though it will introduce some artifacts into the image.  But unless your 
>> readers 
>> will be viewing the image at very high resolution (onscreen), they are not 
>> going 
>> to notice.
>> 
>> Hope that's of some help.
>> 
>> Cheers,
>> 
>> Rob
>> 
> 

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