We have found we get different results depending on whether we are playing off tape or EE through the deck. We now run all our hardings after layback unless we have a super tight turn around. The organ pipes and static patterns failing the test are exactly because they are static (mental i know) here is an excerpt from the OFCOM guidance on this topic:
"5. A potentially harmful regular pattern contains clearly discernible stripes when there are more than five light-dark pairs of stripes in any orientation. The stripes may be parallel or radial, curved or straight, and may be formed by rows of repetitive elements such as polka dots. If the stripes change direction, oscillate, flash or reverse in contrast they are more likely to be harmful than if they are stationary. If the patterns obviously flow smoothly across, into, or out of the screen in one direction they are exempt from restriction.
5.1. Potentially harmful patterns are not permitted when either of the
following two conditions apply:
i. the stripes are stationary and the pattern occupies more than 40% of the displayed screen area; or
ii. the stripes change direction, oscillate, flash, or reverse in contrast and the pattern occupies more than twenty five per cent of screen area; and in addition to either of the above two conditions applying, when
iii. the screen luminance of the darker bars in the pattern is below 160 cd.m-2 and differs from the lighter bars by 20 cd.m-2 or more (see notes 1 and 2)."
So here it seems to be saying that it's harmful for patterns to move but also if they stay still! You're damned if you do and damned if you don't. Transitions to saturated reds is also a hot topic at the moment! I heard that recently a large UK broadcaster was running its archive through the harding and almost everything from the old days failed - the opening titles sequence to a very well known 80's/90's childrens television show failed hugely. It does make you wonder and the fact that there are more than one version of the test seems ridiculous too - we'll have a pass at our end and the BBC will fail it! pain in the arse as how the hell are we meant to fix it when it passes at our end?? That little machine has caused many a late night headache!
Andi
--- In Avid-L2@yahoogroups.com, "shieldsy72" <PaulShieldsAvidL@...> wrote:
>
> Has Prof Harding ever explained how a static shot of some church organ pipes / venetian blinds can trigger epilepsy? Seen the FPA fail both.
>
>
>
>
>
> --- In Avid-L2@yahoogroups.com, "Tony Quinsee-Jover" <tony@> wrote:
> >
> > Agreed on all points.
> >
> > Tony
> >
> >
> > HD Heaven Media Limited (company no: 07061040) is registered in England and
> > Wales at Sapphire Heights Courtyard, 31 Tenby Street North, Birmingham B1
> > 3ES
> >
> > -----Original Message-----
> > From: Avid-L2@yahoogroups.com [mailto:Avid-L2@yahoogroups.com] On Behalf Of
> > Pat Horridge
> > Sent: 25 February 2011 18:50
> > To: Avid-L2@yahoogroups.com
> > Subject: [Avid-L2] Re: Strobing Makes The News!
> >
> > But isn't pedestal re-adjusted at the consumers display? So contrast looks
> > the same? I can't imagine folks watching sat up content.
> > In which case whatever device is used to check PSE would have to compensate.
> >
> > But yes contrast reduction is a frequent fix.
> > One other consideration and concern is that different Harding boxes can
> > produce different results with some passing a failure from another box.
> > Also some content can pass and then fail on the second run.
> > Clearly the current method of measure and pass/fail is inadequate. (or
> > deliberately vague to prevent others competing).
> >
> > Sent from Pat's iPhone
> >
>
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