I'm working with Python 2.7.3 and PIL/Pillow and want to create text (with opacity) on an alpha_channel background saved as png. Here is my code wich doesn't do exactly, what I was hoping:
我正在使用Python 2.7.3和PIL/Pillow，希望在保存为png的alpha_channel后台上创建文本(不透明)。这是我的密码，我并没有做我所希望的:
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
from PIL import ImageEnhance
width=854
height=480
opacity=0.8
text='copyright'
filename = 'result.png'
black = (0,0,0)
white = (255,255,255)
font = ImageFont.truetype('verdana.ttf',15)
wm = Image.new('RGBA',(width,height),white)
im = Image.new('L',(width,height),0)
draw = ImageDraw.Draw(wm)
w,h = draw.textsize(text, font)
draw.text(((width-w)/2,(height-h)/2),text,white,font)
en = ImageEnhance.Brightness(wm)
#en.putalpha(mask)
mask = en.enhance(1-opacity)
im.paste(wm,(25,25),mask)
im.save(filename)
Result: 
结果:
The following code is what I'm looking for, but the background fully transparent/alpha_channel:
下面的代码是我正在寻找的，但是背景完全透明/alpha_channel:
import PIL
from PIL import ImageFont
from PIL import Image
from PIL import ImageDraw
width = 854
height = 480
black = (0,0,0)
text = "copyright"
white = (255,255,255)
font = ImageFont.truetype("Arial.ttf",40)
img = Image.new("RGBA", (width,height),white)
draw = ImageDraw.Draw(img)
w, h = draw.textsize(text, font)
draw.text(((width-w)/2,(height-h)/2),text,black,font=font)
draw = ImageDraw.Draw(img)
#img.putalpha
img.save("result.png")
#img.show
Result: 
结果:
1 个解决方案
#1
3
The problem is that wm has the same color as the text, so you won't see anything if you draw the text onto it. Change the color of wm to transparent, like I did below (and remove the commas after initializing of width, height and opacity):
问题是，wm的颜色与文本相同，所以如果您将文本绘制到它上面，就不会看到任何内容。将wm的颜色改为透明，如下所示(在初始化宽度、高度和不透明度后删除逗号):
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
from PIL import ImageEnhance
width=854
height=480
opacity=0.8
text='copyright'
filename = 'result.png'
black = (0,0,0)
white = (255,255,255)
transparent = (0,0,0,0)
font = ImageFont.truetype('verdana.ttf',15)
wm = Image.new('RGBA',(width,height),transparent)
im = Image.new('RGBA',(width,height),transparent) # Change this line too.
draw = ImageDraw.Draw(wm)
w,h = draw.textsize(text, font)
draw.text(((width-w)/2,(height-h)/2),text,white,font)
en = ImageEnhance.Brightness(wm)
#en.putalpha(mask)
mask = en.enhance(1-opacity)
im.paste(wm,(25,25),mask)
im.save(filename)
#1
3
The problem is that wm has the same color as the text, so you won't see anything if you draw the text onto it. Change the color of wm to transparent, like I did below (and remove the commas after initializing of width, height and opacity):
问题是，wm的颜色与文本相同，所以如果您将文本绘制到它上面，就不会看到任何内容。将wm的颜色改为透明，如下所示(在初始化宽度、高度和不透明度后删除逗号):
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
from PIL import ImageEnhance
width=854
height=480
opacity=0.8
text='copyright'
filename = 'result.png'
black = (0,0,0)
white = (255,255,255)
transparent = (0,0,0,0)
font = ImageFont.truetype('verdana.ttf',15)
wm = Image.new('RGBA',(width,height),transparent)
im = Image.new('RGBA',(width,height),transparent) # Change this line too.
draw = ImageDraw.Draw(wm)
w,h = draw.textsize(text, font)
draw.text(((width-w)/2,(height-h)/2),text,white,font)
en = ImageEnhance.Brightness(wm)
#en.putalpha(mask)
mask = en.enhance(1-opacity)
im.paste(wm,(25,25),mask)
im.save(filename)