No problem here Terry!

Peter

Hi Peter,

That's odd...

Did you play around with it as described?

Try these steps:

I also suspect it's complicated by the bug I identified in the following thread, because the behaviour seems to depend on the filenames and whether they've been inside MEP previously or not.

http://www.magix.info/uk/mep-17-mx-2013-sizing-display-bug.forum.883613.html

Did you also see my comments last night about this in my reply to you here?
http://www.magix.info/uk/green-screen-results-magix-v-paintshop-pro.forum.892818.html

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Terry, East Grinstead, UK

All of that buggy/unstable behaviour disappeared when I changed Program Settings > Display options > Video mode from Standard (H/W Accel) to Alternative (Overlay Mixer).

The price I pay for this is that rendering takes about 25% longer. Although I suppose I could switch it back on just for that? And maybe there are other downsides?

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Terry, East Grinstead, UK

Hi Terry

You sure seem to get some strange things happening.That switching out of H/W accel display mode makes me  wonder maybe that your system has a problem. Perhaps your graphics card has a fault - can you do some sort of torture test or swap it out and see if things improve. My 8800GT died a while ago but it was fairly sudden and obvious. GPU-Z has a ? button next to the PCI Bus Info window which starts a render test which cranks the card up to maximum. While it says it is not a stress test, it might show something.

I did see your comments in the other thread and have been doing a bit of testing following your step by step and I can not say I am getting display corruption but I do see the colour correction indication on the clip as soon as I select it which can not be removed by resetting. This is strange but I do not see it causing a problem and I also see it in MX. I did however start getting program lock ups after much fiddling around in CC and a couple of access violations in the ntdll.dll, but all this went away after a Windows restart.

The CC is actually more correctly called Secondary Colour Correction and using Add > Foreground creates a mask when a colour is selected with the pipette, which allows you adjust that area only, with the hue wheel. The grey area selected only becomes active when you adjust the wheel colour angle / level or the saturation. Once foreground is adjusted you can switch to background > add and adjust everything else to a different colour or black and white.

I had already considered your idea as to whether CC could be used to make your Greenscreen a better green and in fact it can even out the variation in shades by multiple selections with the pipette but I could not get any benefit in terms of creating a cleaner edge selction if the edge does not have a definite change in contrast/colour. I tested this in Chroma Key by using a jpeg of a Hue wheel where it fades from one hue and shade to the next. Actually it is well worth having a play with such an image in Chroma Key as it helps you to get a feel for what the sliders are doing. If you do the same with the SMPTE colour bar swatch in MEP you can get a different angle on it and see that with a defined edge the selection is very accurate even with the preview monitor zoomed 800% (Ctrl+Mousewheel).

I realised during this that my observation about the Chroma key selection being hit or miss was in fact nonsense, not realising that in CKey you have to drag over an area to select and a bounding box appears. Should have read the manual.....

Peter

Hi Peter,

Thanks for the thorough testing, much appreciated. It's surprising that no one else can reproduce these problems. It could indeed be a graphics card problem but I'm inclined to doubt it as I get no problems in other graphics or video apps. And it does seem to be consistent with the other HWA-related problesm I've had, most of which Ralf has reproduced.

Although I gave my case innards a good air blasting a week or so ago, I suppose it could be a temperature problem, under intensive processing? I still can't remember what that tool was I used to use to check GPU temp, can you? I seem to remember you had the same utility? An unusual hotkey combination immediately displayed a full screen showing a 'carousel' of options. I've been scouring my HD but so far haven't found it!

If the only downside of unchecking the HWA video mode is 25% slower rendering, then for the time being at least I reckon I'll leave it like that and get on with some creative work!

Yes, I reckoned at the time that you'd made the same mistake as I did initially, and simply clicked the colour (which is what i do in PSP8) instead of dragging out a section.

I think I've now got the hang of the CC dialog, but IMO it sure is anything but obvious!

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Terry, East Grinstead, UK

Hi Terry

It's a pleasure to be able to help and it always clarifies things in my own mind as well. Like the colour selection in Chromakey which is different to the click by click selection in CC!

Forget about that tool you are thinking of - it was an Nvidia thing and we both uninstalled it be cause it seemed to be causing problems. In my last reply I was talking about GPU-Z - free from TechPowerup. It is much better and you can do the test I mentioned as well as monitor in realtime on the sensors tab - GPU load, memory controller load, temp and fanspeed and a raft of other stuff. Interesting to observe it when HW rendering an export and you can see that Magix is using quite a lot of the graphics card resources.

Peter