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

Sat Jan 14 16:51:00 GMT 2012

I fixed the file sizes to be small enough to fit the Xerte stage in the first place so I don't think it's shrinking that's doing the damage. And my understanding is that Xerte doesn't autoexpand images if they are smaller than the stage. I'll try a small file upload as you suggest though and see what happens.

A

From: xerte-bounces at lists.nottingham.ac.uk [mailto:xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Pat Lockley
Sent: 14 January 2012 16:43
To: Xerte discussion list
Subject: [Xerte] Re: FW: jpgs degrading - is this a new phenomenon?

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<mailto: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<mailto:d_b_burnett at hotmail.com>
To: xerte at lists.nottingham.ac.uk<mailto: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<mailto:Alistair.McNaught at HEAcademy.ac.uk>
To: xerte at lists.nottingham.ac.uk<mailto: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.

[cid:image001.png at 01CCD2DC.82D09E90]

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.

[cid:image002.png at 01CCD2DC.82D09E90]

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

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