Indigo dye is straight purple in the mod, it should be a purplish blue

Artistic freedom

The color is correct. I pulled it directly from an indigo flower.

Should be more like http://i.imgur.com/zDJR18z.png

Might as well call it purple dye with current texture.

http://goo.gl/K3JwwF is the flower color that it was pulled from. Photoshop has an algorithm it uses to match colors. http://en.wikipedia.org/wiki/Indigo if you look down the side of the wikipedia page there are various shades of indigo. Don't nitpick. I'm not an idiot when choosing a color.