I have copied a text interspersed with black outlined on a homogeneous gray background. All is in black and 'white'.
Is there a way to remove the gray background? I would like to print the text and the outlines on white.
Use the Magic Wand tool with the "Contiguous" setting off to select the gray areas and hit your Delete key.
Just a bit of amplification.
When ########you open your file, you will see that the background layer is a locked layer. Drag the padlock icon to the trash bin to unlock it - it will then be Layer 0. Now use the magic wand tool.