How do I increase resolution...
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When you go to print, you're mainly going to be concerned with dpi. By default I believe that most image editing apps will set the dpi to 72. For print, you're going to want to set this to somewhere around 300, but it all depends on the capability of the printer you are going through, so you had better ask them what dpi they are looking for. The output from our product should be at 72 dpi I believe. So yes, you are going to have to set a larger output size, and then set the dpi to something much higher in Gimp (or Photoshop if you prefer). This will give the visible effect of the image appearing to be resized to a smaller resolution, but you should notice that you can zoom in to the image until it's the same size on screen as it was prior to the change, and there will be no hit to the quality of the image as there normally would be if you actually resized the resolution of the image. That's because all you are changing, is how much image data gets crammed in to a given area of your screen (or print), rather than modifying the image size and losing some of the image data.
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also - as you increase the resolution - you can decrease the irradiance map min and max rates.
so you can go to -4 and -2 or -5 and -3 for the larger resolutions. There's another post somewhere with better information, but that's the gist of it. -
I think your GI settings look good. I would raise your Light Cache to something like 1400. The image sampler is the most important but also increases render times the most, .005 is a really good production setting as you have it. I think the only think you need to change is your output resolution. I would render final production renders at 4500 pixels wide as a minimum. At 300 dpi, this will yield a 15" wide image which should be more than enough for your brochure. I would be prepared to cook this render overnight depending on the horsepower of your machine and the complexity of the model.
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As for the how to - just go to your options, output, get view aspect, click the L to lock it, then type in 4500 in the width box, with your aspect locked, the height will auto adjust. Also, with the aspect locked, your render will match your SU viewport exactly.
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