尝试将此ImageMagick命令转换为Python Wand代码,但我没有看到使用Wand创建渐变图像的方法。
convert -size 800x800 gradient:"rgba(0,0,0,0.12)-rgba(0,0,0,1)" gradient_overlay.png
convert gradient_overlay.png background.png -compose Overlay -composite -depth 8 background_gradient.png
有人知道我是怎么用魔杖做到这一点的吗?
发布于 2018-06-24 08:40:07
下面是我基于fmw42反馈解决这个问题的方法
with Color('black') as blackColor:
with Image(width=800, height=800, background=blackColor) as black:
blackPath = existing[:existing.rfind('/') + 1] + 'black.png'
with Color('white') as whiteColor:
with Image(width=800, height=800, background=whiteColor) as alpha:
fxFilter = "(j*(1-0.12)/(h-1)+0.12)"
with alpha.fx(fxFilter) as filteredImage:
black.composite_channel('default_channels', filteredImage, 'copy_opacity', 0, 0)
black.save(filename=blackPath)
发布于 2018-06-25 20:52:24
您将需要分配一个wand实例,设置画布大小,然后读取伪图像格式。
from wand.image import Image
from wand.api import library
with Image() as canvas:
library.MagickSetSize(canvas.wand, 800, 800)
canvas.read(filename="gradient:rgba(0,0,0,0.12)-rgba(0,0,0,1)")
canvas.save(filename="gradient_overlay.png")
https://stackoverflow.com/questions/50997786
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