[英]Adding a transparent circle to an image on python with PIL
I have a python program that craetes a png file with a circle on it. 我有一个python程序,该程序可在png文件上放一个圆圈。 Now I want this circle to be semi transparent, given an alpha value.
现在,给定一个alpha值,我希望这个圆是半透明的。
Here is what I do: 这是我的工作:
img_map = Image.new(some arguments here)
tile = Image.open('tile.png')
img_map.paste(tile, (x,y))
canvas = ImageDraw.Draw(img_map)
# Now I draw the circle:
canvas.ellipse((p_x - 5, p_y - 5, p_x + 5, p_y + 5), fill=(255, 128, 10))
# now save and close
del canvas
img_map.save(path_out + file_name, 'PNG')
how can I make the ellipse semi transparent? 如何使椭圆半透明?
Thanks 谢谢
Instead of a 3-tuple RGB value, (255, 128, 10), pass a 4-tuple RGBA value: 传递3元组RGBA值,而不是3元组RGB值(255、128、10):
canvas.ellipse((p_x - 5, p_y - 5, p_x + 5, p_y + 5),
fill=(255, 128, 10, 50))
For example, 例如,
import Image
import ImageDraw
img = Image.new('RGBA', size = (100, 100), color = (128, 128, 128, 255))
canvas = ImageDraw.Draw(img)
# Now I draw the circle:
p_x, p_y = 50, 50
canvas.ellipse((p_x - 5, p_y - 5, p_x + 5, p_y + 5), fill=(255, 128, 10, 50))
# now save and close
del canvas
img.save('/tmp/test.png', 'PNG')
I used Image.composite(background, foreground, mask)
to mask a semi transparent circle on a foreground. 我使用
Image.composite(background, foreground, mask)
遮罩了前景上的半透明圆。
I followed the instructions from here: Merging background with transparent image in PIL 我按照这里的指示进行操作: 在PIL中将背景与透明图像合并
Thanks to @gareth-res 感谢@ gareth-res
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