Is there a workaround for error: "Could not write image: Too many open files"? I'm on windows 10, version 2.79 of blender. I've rendered a small (&lt;1080p) image and when I attempt to save it it fails with error:

Could not write image: Too many open files.

I have tried saving by using Image>Save As Image(F3) as well as rendering a one-frame animation. This error does not occur with any smaller projects. But this project contains 1,275 textures. I have tested up to 485 textures without issues. Deleting and removing a few of these textures doesn't seem to make a difference. Any thoughts would be appreciated. Cheers!

Message me if a blend file is necessary to solve this.
The workaroud that I have developed is as follows. 


Render my scene.
View>Toggle Fullscreen Area
View>View Fit
Zoom in to a level where the pixels in the image are larger than the pixels of your display. 
Take screen captures of each part of the image. (On Windows, Shipping Tool works well)
Stitch these together in an image editing software. I used Photomerge in Photoshop Elements.
Remove the border using a pixel color select tool and crop (in Photoshop Elements, the magic wand works well)
Resize your image to the original desired resolution. This is also an opportunity to touch up those nasty fireflies.
Save and share. 


I hope this helps.