[Xerte] Re: FW: jpgs degrading - is this a new phenomenon?

[Pat Lockley]

PNG is lossless compression isn't it?
Maybe it scales better due to the different compression algorithm?

If you upload a smaller jpeg (so no xerte scaling) and the same file as a
PNG, do they look the same?

Nice ITCZ by the way.

On Sat, Jan 14, 2012 at 4:35 PM, Dave Burnett <d_b_burnett at hotmail.com>wrote:

>  Sorry, those are both on the same screen aren't they.
>
> How about Flash version then?
> I'm just wondering if they way Flash handles the rendering.
> Same effect on a different machine?
>
>
> From: d_b_burnett at hotmail.com
> To: xerte at lists.nottingham.ac.uk
> Subject: RE: [Xerte] jpgs degrading - is this a new phenomenon?
> Date: Sat, 14 Jan 2012 11:28:37 -0500
>
>
>  Latest video drivers?
>
>
>
> ------------------------------
> From: Alistair.McNaught at HEAcademy.ac.uk
> To: xerte at lists.nottingham.ac.uk
> Date: Sat, 14 Jan 2012 16:26:22 +0000
> Subject: [Xerte] jpgs degrading - is this a new phenomenon?
>
>  This seems weird but yesterday I was demonstrating a learning object to
> some colleagues I was working with and I noticed that the images which I’d
> carefully crafted to be crisp and sharp and fit the available space were
> looking pixellated and ugly with lots of jpegy artefacts (like when you
> save a jpeg at too coarse a setting and get fuzz around lines etc). The
> originals I uploaded are much higher quality.
>
>
>
>
>
>
>
> However no such degradation is apparent with PNG files as shown below: (as
> before the original is at the bottom and the Xerte rendered version at the
> top). In this case the quality is indistinguishable.
>
>
>
>
>
> Is something taking place in the upload that degrades the jpgs or how is
> this oddity explained. For the short term I can use PNGs rather than JPGs
> but it introduces an extra work layer and It doesn’t help the dozens of LOs
> that used to look crisp and now look fuzzy. Any suggestions gratefully
> received!
>
>
>
> A
>
>
>
>
>
>
>
>
>
>
>
> Alistair McNaught
>
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