I need to remove the white background from this image and make the background transparent. So it's just a black tick on the transparent background exported as a png.
我需要从此图像中删除白色背景并使背景透明。所以它只是透明背景上的黑色刻度，导出为png。
e.g. Turn
例如转
Into
成
Any ideas?
有任何想法吗？
3 个解决方案
#1
9
convert image.png -matte -fill none -fuzz 1% -opaque white result.png
convert image.png -matte -fill none -fuzz 1％-opaque white result.png
Replaces anything white with transparency. The fuzz option includes anything that is almost-white.
用透明度替换任何白色。模糊选项包括几乎是白色的任何东西。
#2
2
I know I am pretty late to the party, but a lot has changed since this question was first posted, so here is how you can do it today using at least version 2.15.4 of rmagick
我知道我参加派对的时间已经很晚了，但是自从这个问题首次发布以来已经发生了很多变化，所以今天至少使用2.15.4版本的rmagick是如何做到的
Assuming you have the image somewhere accessible:
假设你有一个可访问的图像：
image = Magick::Image.new(path_to_file)
image.background_color = 'none'
If you also want to trim the image so it's only as big as it boundaries, simply use .trim!
如果您还想修剪图像，使其仅与边界一样大，只需使用.trim即可！
image.trim!
EDIT:
编辑：
Turns out the solution above does not really work for all use cases. A more general solution is this:
事实证明上面的解决方案并不适用于所有用例。更通用的解决方案是：
# the image needs to be in 'PNG' format
image.format = 'PNG'
# set a fuzz on the image depending on how accurate you want to be
image.fuzz = '10%'
# get the image background color
background_color = image.background_color
# convert pixels based on their color to being transparent
# the fuzz set above controls how accurate the conversion will be
image.paint_transparent(background_color)
#3
1
With v6.8.4-Q16 using the below command:
使用以下命令使用v6.8.4-Q16：
convert nike.png -matte -fill none -fuzz 1% -opaque white nikeOutput.png
Results in:
结果是：
Here is the command I use:
这是我使用的命令：
convert nike.jpg -transparent white NikeProd.png
#1
9
convert image.png -matte -fill none -fuzz 1% -opaque white result.png
convert image.png -matte -fill none -fuzz 1％-opaque white result.png
Replaces anything white with transparency. The fuzz option includes anything that is almost-white.
用透明度替换任何白色。模糊选项包括几乎是白色的任何东西。
#2
2
I know I am pretty late to the party, but a lot has changed since this question was first posted, so here is how you can do it today using at least version 2.15.4 of rmagick
我知道我参加派对的时间已经很晚了，但是自从这个问题首次发布以来已经发生了很多变化，所以今天至少使用2.15.4版本的rmagick是如何做到的
Assuming you have the image somewhere accessible:
假设你有一个可访问的图像：
image = Magick::Image.new(path_to_file)
image.background_color = 'none'
If you also want to trim the image so it's only as big as it boundaries, simply use .trim!
如果您还想修剪图像，使其仅与边界一样大，只需使用.trim即可！
image.trim!
EDIT:
编辑：
Turns out the solution above does not really work for all use cases. A more general solution is this:
事实证明上面的解决方案并不适用于所有用例。更通用的解决方案是：
# the image needs to be in 'PNG' format
image.format = 'PNG'
# set a fuzz on the image depending on how accurate you want to be
image.fuzz = '10%'
# get the image background color
background_color = image.background_color
# convert pixels based on their color to being transparent
# the fuzz set above controls how accurate the conversion will be
image.paint_transparent(background_color)
#3
1
With v6.8.4-Q16 using the below command:
使用以下命令使用v6.8.4-Q16：
convert nike.png -matte -fill none -fuzz 1% -opaque white nikeOutput.png
Results in:
结果是：
Here is the command I use:
这是我使用的命令：
convert nike.jpg -transparent white NikeProd.png