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

Sat Jan 14 17:58:18 GMT 2012

Right click on the Xerte piece - what flash version?

On Sat, Jan 14, 2012 at 5:45 PM, Alistair McNaught <
Alistair.McNaught at heacademy.ac.uk> wrote:

>  A final version with 3 pairs of images (jpg v png) at  sizes 300, 360
> and 550 respectively. In all cases jpgs show significant degradation. PNGs
> only show degradation at the 550 px point where they are being shrunk from
> 550 to 470 to fit the space.
>
>
>
> In the short term I’ll stop using jpegs in favour of pngs and gifs but in
> the long term I’d be really interested to know why jpegs fare so badly.
> They will be the format of choice for a lot of less technically inclined
> users so if it ispossible to determine whether the code has changed and if
> so to change it back I’d be very grateful.
>
>
>
> That’s all the excitement needed for one weekend – I’m signing out now!
>
>
>
> All the best and thanks for the rapid responses Dave and Pat.
>
>
>
> 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 17:08
> *To:* Xerte discussion list
> *Subject:* [Xerte] Re: FW: jpgs degrading - is this a new phenomenon?
>
>
>
> It looks like XOT is stretching them, and so is having to fill in bits
> (which is degradation via interpolation, which sounds redundant but lacking
> the words to find a better one - negative amelioration?)
>
>
>
> The originals are fine.
>
>
>
> What's the maximum size? 640 something?
>
> On Sat, Jan 14, 2012 at 5:02 PM, Alistair McNaught <
> Alistair.McNaught at heacademy.ac.uk> wrote:
>
> Hmmm – here’s the test I did for Pat:
>
> First 2 slides of http://itq.jisctechdis.ac.uk/xerte/play_82 show
> significant quality difference yet the image below shows they are virtually
> identical in their raw form.
>
>
>
>
>
> Curiouser and curiouser..
>
>
>
>
>
>
>
>
>
> *From:* xerte-bounces at lists.nottingham.ac.uk [mailto:
> xerte-bounces at lists.nottingham.ac.uk] *On Behalf Of *Dave Burnett
> *Sent:* 14 January 2012 16:56
> *To:* Xerte list
>
>
> *Subject:* [Xerte] Re: FW: jpgs degrading - is this a new phenomenon?
>
>
>
>
> >does it look equally blurry on your PC on that slide?
>
>
>
> Yes.
>
>
>
> Vista/Chrome
>
>
>
>
>  ------------------------------
>
> From: Alistair.McNaught at HEAcademy.ac.uk
> To: xerte at lists.nottingham.ac.uk
> Date: Sat, 14 Jan 2012 16:48:14 +0000
> Subject: [Xerte] Re: FW: jpgs degrading - is this a new phenomenon?
>
> Hi Dave / Pat – thanks for quick responses
>
> Yes these shots are all on same laptop – it appears to be a new problem.
>
> The only PCs I have access to are all the same spec but I’d be interested
> if it looks different on other people’s PCs – for example the LO I first
> spotted it on yesterday is at
>
> http://itq.jisctechdis.ac.uk/xerte/play_79 and page 14 is a slide show
> navigator. Slide 4 on page 14 is shown below as it renders for me and the
> original image is also shown superimposed. Notice how the table has become
> blurry. It wasn’t always like that .. does it look equally blurry on your
> PC on that slide?
>
>
>
>
>
>
>
> Alistair
>
>
>
>
>
> *From:* xerte-bounces at lists.nottingham.ac.uk [mailto:
> xerte-bounces at lists.nottingham.ac.uk] *On Behalf Of *Dave Burnett
> *Sent:* 14 January 2012 16:36
> *To:* Xerte list
> *Subject:* [Xerte] FW: jpgs degrading - is this a new phenomenon?
>
>
>
> 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
>
> Senior Advisor
>
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>
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>
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>
>
>
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> resource <http://itq.jisctechdis.ac.uk/mod/resource/view.php?id=5>.
>
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