How do I make the gray lines in this .pdf A LOT darker?

[Zakcy]

There's a .pdf file I need to make darker. It's sheet music :P

The lines are very light, making the music hard to read. I need them to be as dark as possible, or as black as possible.

Could anyone give me some advice on how I could do this? I'd really appreciate it!

Thanks so much!

[Stric9]

Use a Black fill layer above the music. Then use Blend if in the blending options dialog box. If you post the image in question directions would be easier to give.

[PseFrank]

Another way of doing this would be to make a screen grab of the pdf and save it as a .jpg. Then open it in photoshop and adjust the levels.