# Can Blender save Rendered image periodically [duplicate]

I usually render still images with very high samples(1000-5000) in cycles render engine.I leave this rendering on my desktop PC overnight. I was wondering if there is a feature/addon that can save the rendered image every 100 samples or every 30 mins or something of the sort. So that when I wake up in the morning and there was a power outage during the middle of the render, I still have a render close to the quality I wanted rather than none.

• I believe the "save buffers" setting in Render settings > Performance does something like this, however I haven't tested it. – gandalf3 Feb 17 '17 at 7:52
• Maybe this answer is useful for you as well. – binweg Feb 17 '17 at 7:56
• @gandalf3 I have searched all over the internet for details about that feature nothing comes up.Could you explain more on it. – Bob Kimani Feb 17 '17 at 8:49
• @binweg unfortunately it doesn't – Bob Kimani Feb 17 '17 at 8:49
• @Jamesup Unfortunately, after some testing, it appears save buffers does not do what I thought. It caches finished renderlayers to disk (by default in /tmp/blender_<random_hash>/_<scene name>_<renderlayer name>.exr) – gandalf3 Feb 17 '17 at 9:54

There is a trick that you can recombine images in post editing with blender. Then you can combine 10 images or so, (using animated seed settings).

So you render a still image as animation images with lower sample rates and recombine them. it takes a bit of manual work to recombine, render speed is slightly lower (bhv rebuilds between frames). for the rest doable. in the beginning some people hoped to reduce noise.

or in theory one could use this method to increasingly improve a real animation render if you store the images in different folders (by some scripting).

But you might also check the latest blender builds and the denoiser, unless you do a lot of diamont /glass reflections such a sample settings can be decreased a lot.