Hi Chris, Tom,It does seem a bit confusing. QC seems to by default resize the video input down. Also, by default it resizes other images up. I added a 1x1 pixel image feeding a billboard and it enlarged it to be a large block almost the same size.
I suppose it must do that so you have something visible to get started with. Anyway that's enough to get me going. Thanks, Max 2009/8/18 Chris Wood <[email protected]> > QC uses two sets of measurements, which can be a bit confusing at first. > > In some places it uses pixel sizes, so e.g. if you wanted to resize your > video input you would resize it to say 320 x 240 pixels. > > In other places it uses QC units, which let you position things on screen > without worrying about what happens when the window gets resized. The view > is 2 units wide, from -1 to +1, so 0 is in the centre. For height, 0 is in > the centre, but the top and bottom depend on the aspect ratio, so for a wide > window it's usually 0.6 or so. > > So to get your image filling the window, just set the width to 2, and QC > will handle resizing etc. 'Pixel aligned' just means that the image will be > lined up to the nearest pixel - otherwise you might have it set so that it's > "between pixels" which causes a little blurring. > > You can also change the size mode in the settings of the billboard patch - > 'real size' will draw it 1:1 on screen, so it will fill exactly 640x480 > pixels, all the other modes use QC units. > > Chris > > > > On 18 Aug 2009, at 11:01, [email protected] wrote: > > Hi Folks, >> first, this is probably a fairly dumb question. I'm still trying to get to >> grips with QC fundamentals. >> >> Basically, I'm playing round with displaying multiple images in the QC >> Viewer. I'm curious, how does it handle image sizes and resolutions? >> >> I have video input which I believe from the built-in iSight camera is 640 >> x 480. The Viewer puts this as a default in the centre. It's about half the >> size of the Viewer window, and resizes automatically (see attached). >> >> Any idea how this works? Or even if it's something I need to bother with? >> I have a look at Apple's documentation but it doesn't have much info. I see >> parameters like "Pixel Aligned" for the billboard renderer but there doesn't >> seem to be much info on what they do. >> >> Many thanks, >> Max >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Quartzcomposer-dev mailing list ([email protected]) >> Help/Unsubscribe/Update your Subscription: >> >> http://lists.apple.com/mailman/options/quartzcomposer-dev/psonice%40gmail.com >> >> This email sent to [email protected] >> > >
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