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I just attempted to do a Render Region, but it is way darker than the same area in a full image. I can take it into Pshop to fix that, but I would rather not have to do that.

Wy is it coming out darker?

Here is an example:

Hi treddie,
which version exactly?
Have you already tried with the latest 3.04 version?
viewtopic.php?f=24&t=56856
ciao beppe

Not yet. I didn't know that there was the newest update. I'll give it a try. I have to finish a render first, then I can update and post back.

Thanks!

ciao beppe,

Just ran a test and the same problem is in 3.04 as in 3.03.4.

Tom

Hi treddie,
weird, I have tried in several way to reproduce your issue, do you mind to share your exact procedure that you do to save the render region image?
thanks in advance,
ciao beppe

I always save the .ocr in case something bad happens, along with a .png. To save the .ocr, I simply do "Save render state" and name the file appropriately. To save the .png, I just do a right click in the render window, and save the image that way.

One problem with this file that took a while to figure out, was getting the kernel set properly to render the full image correctly. There are 326 indirect lights (all the backlit pushbuttons and gauges), and only 10 direct lights (the lights on the walls and the monitor screens). That having been said, when I do a render region, the result in the render window itself is clearly too dark, just like you see in the saved image.

Could all of this be due to the really high amount of indirect lights?

Hi treddie,
so is not related with the saving process, if you see the dark effect also in Viewport.
I remember that your scene is particular, unfortunately I cannot reproduce the issue here, so maybe is because of the particular setup. Do you have the same behavior if you try with a different scene on your system?
ciao beppe

I will experiment with a scene that is more typical in terms of lighting and will report back.

Tom

Are you using the PMC kernel? Usually it works fine with region rendering, but in some corner cases the weighting during seeding may produce a wrong result resulting in an incorrect brightness. Use path tracing in those cases.