线条不会使用ImageDraw在图像上绘制

Question

I am trying to use PIL to open an image, then draw a line on it, but it is not working. I am trying to make a leveling display, with the line being how far the user has leveled up.

I've tried creating a new image using Image.new , and having a base already available and opening it using Image.open , and I've also tried putting the coordinates directly into the function, and just putting the two-tuples as variables and calling those variables into the function (as seen below). The base image is a transparent image.

    length = 300 # Used as a placeholder integer, as this would change depending on user's level
    base = Image.open('./level_up/base.png')
    draw = ImageDraw.Draw(base)
    pos1 = (280, 324)
    pos2 = (280, length + 324)
    draw.line((pos1, pos2), fill=(255, 102, 168), width=20)
    base.save('./level_up/base2.png')

I open up the image, which is a blank, transparent image that is 1500 x 296 , and nothing is there. No line or anything.

Answer 1

As you are working with an image containing transparency (mode "RGBA" in PIL), you have to explicitly pass an opacity as the 4th component of colors. Just add "255", meaning 100% opacity to the fill color in your call for line, and it should work:

draw.line((pos1, pos2), fill=(255, 102, 168, 255), width=20)