rmagick is there a way to convert image in memory

From Rmagick guide:

来自Rmagick指南:

Converting an image to another format

将图像转换为另一种格式

Converting an image to another format is as simple as writing the image to a file.

将图像转换为另一种格式就像将图像写入文件一样简单。

ImageMagick uses the output filename suffix (".jpg" for JPEG, ".gif" for GIF, for example) or prefix ("ps:" for PostScript, for example) to determine the format of the output image.

ImageMagick使用输出文件名后缀(例如,JPEG为“.jpg”,GIF为“.gif”)或前缀(例如,对于PostScript为“ps:”),以确定输出图像的格式。

Is there a way to convert image in memory?

有没有办法在内存中转换图像?

1 个解决方案

#1

# assuming you have an image
# img = Magick::Image.new( 100, 100 )
img = Magick::Image.from_blob( img.to_blob { self.format = "png" } )

Source: RMagick Docs

资料来源:RMagick Docs

Here's an example on how to give it to the user

这是一个如何将其提供给用户的示例

image.format = "png"
send_data image.to_blob,
    :filename => "woohoo.png",
    :disposition => 'inline',
    :quality => 90,
    :type => 'image/png'

#1

# assuming you have an image
# img = Magick::Image.new( 100, 100 )
img = Magick::Image.from_blob( img.to_blob { self.format = "png" } )