如何使用Paperclip创建圆角?我找到了这个创建rounded corners with paperclip using convert_options的解决方案,但它不适用于Rails 3和Paperclip 2.4.5。生成的convert命令仅在我使用ImageMagick alpha parameter而不是阈值参数时才有效:
convert example.jpg \
\( +clone -alpha extract \
-draw 'fill black polygon 0,0 0,15 15,0 fill white circle 15,15 15,0' \
\( +clone -flip \) -compose Multiply -composite \
\( +clone -flop \) -compose Multiply -composite \
\) -alpha off -compose CopyOpacity -composite rounded_corners.png
对应
has_attached_file :avatar,
:styles => { :medium => ["918x483#", :png] },
:convert_options => {:medium => Proc.new{self.convert_options}}
def self.convert_options(px = 15)
trans = ""
trans << " \\( +clone -alpha extract "
trans << "-draw 'fill black polygon 0,0 0,#{px} #{px},0 fill white circle #{px},#{px} #{px},0' "
trans << "\\( +clone -flip \\) -compose Multiply -composite "
trans << "\\( +clone -flop \\) -compose Multiply -composite "
trans << "\\) +alpha off -compose CopyOpacity -composite "
end
此代码段似乎产生了正确的转换命令,但是提供了“错误处理stream-xyz的缩略图”。
Command :: convert '/tmp/stream20120109-15817-1lju7p6-0.jpg[0]' -resize "918x"
-crop "918x483+0+105" +repage \( +clone -alpha extract -draw 'fill black polygon
0,0 0,15 15,0 fill white circle 15,15 15,0' \( +clone -flip \) -compose
Multiply -composite \( +clone -flop \) -compose Multiply -composite \) +alpha off
-compose CopyOpacity -composite '/tmp/stream20120109-15817-1lju7p6-....png'
[paperclip] An error was received while processing: #<Paperclip::PaperclipError:
There was an error processing the thumbnail for stream20120109-15817-1lju7p6-0>
答案 0 :(得分:4)
最后我发现它,这是一个简单的错字。您必须使用-alpha off
而不是+alpha off
,然后上面的代码才能正常运行。有时单个符号(而不是+,反之亦然)会产生差异。