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I am trying to make a scene with camera math (using Blender v2.91.0). When I test-rendered the scene, it took all day to render, even though it is a very simple scene so far (my computer is not very fast). So I would very much like to reduce the render-resolution to speed the rendering.

But when I set set the Resolution to 50% (or something else smaller then 100%) it only scales the rendered elements down, the background image it put in full size cropped (It correct in the viewport and when I render in 100% resolution).

I have tried all I can think of, to correct this: "Frame Method: Stretch", "Frame Method: Fit", "Proxy Render Size 50%"

And I have spend a long time trying to Google solution, but with no luck.

I guess, it is a simple thing, I have missed, and I hope someone here can help me.

The first picture is how it is supposed to be (screen dump from viewport). The second picture is how it looks rendered in 50% resolution :( Correct scale

Wrong Scale

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No, blender will not automatically resize the image when you render at 50%. It will only render 50% percent of the pixels around the center of the image (Think of the percentage not as a resize, but as a crop).

If you want to resize use a scale node, set it to render size and Fit, so that the image is rescaled using the output resolution.

enter image description here

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  • $\begingroup$ Thank you very much, that did the trick :) I do find that strange though. That the 3d elements are resized matching the 50% resolution, but the background cropped instead (as seen on the pictures are the 3D-part higher that the house in the background, in viewport inside Blender (and when rendered in 100%), but when rendered in 50% the 3D-part is barely higher than the gate in the background. But anyways, inserting the scale node works, and I am happy now :) $\endgroup$
    – Don Doh
    Commented Dec 27, 2020 at 13:41

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