Feedback and rendering a still image?

CarlR's picture

Hi, In this example patch an image is moved around the screen and kind of draws its history in the form of a difference feedback loop.The textures are built up over a number of frames creating pattern interference. I can render this out as video no problem with Quartz Crystal but what if I wanted to then choose a frame from the video and render out a still, say frame 300 @ 7680 x 2560 PPI? To be honest I cannot figure out how to render any still in Quartz Crystal! I know there is a CLI version that will go beyond the 2048 limit.

So far I have rendered out some TIFFS as a 1 second image sequence but all I get is a picture of the image but not the feedback drawn.

So; 1 Is it possible to do this with this type of patch, and what would I need to add to the patch for this to work? 2 What is the process to render a single frame as a TIFF (in Quartz Crystal)? i.e what do I put for the duration etc.

I absolutely love this technique of building up textures. It's like photoshop but with the ability to tweak the image in real time. some large scale prints would be great! Any help really appreciated, Carl

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jersmi's picture
Re: Feedback and rendering a still image?

Good question. So far any feedback stuff I have rendered with QuartzCrystal I leave in time at the beginning to build up the feedback then chop it out manually. But i'd love to know how to grab specific frames at hi-res.

Edit: nice patch!

psonice's picture
Re: Feedback and rendering a still image?

You can't render a single frame I think, just an image sequence (select TIFF Sequence under Codec).

Apart from that, you can't render 'only' frame 300. It's a feedback effect, if you start at 300 is the same as rendering frame 1, because it depends on all the frames rendered before it. So you have to render all 300 frames.

jersmi's picture
Re: Feedback and rendering a still image?

Here's a solution, if you can live with png's. This would trigger an image file save every 300 frames.

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CarlR's picture
Re: Feedback and rendering a still image?

That looks interesting thanks. I was hoping to render out with the CLI so to get around the 2048 x 2048 limit. Would this still work? Very useful anyway.

I suppose I could make different versions of the patch that start at different times, and make an image sequence that was just long enough to let the feedback catch up to the frame I want, then pluck the right one out from the bunch for printing. This will take a bit longer and I will have to do some gymnastics to get the frames I want.

jersmi your solution looks better and better the more I think about it. Now if I could just get my head around using the CLI! I can CD to the dir where Quartz Crystal is but then I fail!

jersmi's picture
Re: Feedback and rendering a still image?

Might kill your fps, but could produce results.