I have a flat die line image in
jpg format ready to go to the machine for cutting, but the machine accepts only a red pattern to cut through and the current image has a pattern in blue.
I have tried manually changing the color in Photoshop but there are some curves and edges that I could not color correctly.
How do I change the blue to red in Photoshop? I am using CS6
The machine accepts below red color (though with a white background instead of red):