Merge and export two layers that utilize blending modes

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I have a new question that I'm trying to solve. Spent more time than I can to admit trying to come up with a solution that doesn't require bringing the layers into Photoshop or the GIMP (which would take an insane amount of RAM/swap space to work on this).

Anyway, here's the setup:Using QGIS 2.8.1 on Ubuntu. 2 layers imported, both have srs and align properly.

Layer 1: Low resolution color imagery for the entire planetLayer 2: Higher resolution B&W imagery for an entire planet

I'm using the color information from Layer 1 and overlaying it on the higher resolution B&W imagery of layer 2. To do this, I use the following:

Layer one: Properties: Color rendering: Blending mode: Hard LightLayer two: Properties: Band rendering: Contrast Enhancement: No enhancementLayer two: Properties: Color rendering: Contrast: -15

After setting these values, the resultant two datasets look very good over one another.

Now, my issues as I see them:

  1. I need to merge the two layers into one
  2. I need to export the resultant merged layer into a geotiff
I can figure out #2 okay using layer: Save As: Output mode: Rendered Image, etc

But, what I cannot figure out is #1. Any help with this would be GREATLY appreciated!

Thanks!

Arthur



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