Hello, I've been using Affinity Photo for about 2-3 weeks now to work on a local client's comic book and I am extremely impressed with the efficiency with the program thus far! However I ran into a problem when attempting to remove the blue guide lines (margins used in comic book coloring). These lines are traditionally color coded blue, so that they're "easier" to erase while in a photo editing software and with Photoshop I had no problems erasing them. However I have tried multiple selection options with Affinity but all the magic wand does is either select everything else including the black or selects individual blue pixels and not the blue lines entirely. The blue itself is slightly transparent so that might be an issue?
Here is what I did to get to this stage if it helps:
Filters > Color > Erase white paper
CTRL + J > CTRL+ E (to make the marker lines darker and then I just merged them together)
Magic Wand tolerance set at 0%.
I mean I could always erase with a layer mask, but I would prefer a cleaner way to select and erase the blue in one go. Any thoughts?