用回形针/Rails将肖像转换为风景，并将左右填充转换为新图像。

I'm using Paperclip and Rails. Currently, if a user uploads a portrait image, Paperclip crops off the top and bottom of the image, and "forces" the middle section to fit my defined styles (provided below).

我用的是回形针和轨道。目前，如果用户上传了一幅肖像照，Paperclip就会从图片的顶部和底部出现，并且“强制”中间部分符合我定义的样式(如下所示)。

What I want, however, is the portrait image to be preserved, and add "spacing" to the left and right of the image. Basically, preserving the portrait image inside of a new landscape image. So far I can only find examples of simply rotating images. See examples below:

然而，我想要的是要保留的人像，并在图像的左右添加“间距”。基本上，在新的风景图像中保存肖像图像。到目前为止，我只能找到简单旋转图像的例子。请参见下面的例子:

Here's my styles info:

这是我的风格信息:

has_attached_file :image,
                  :styles => { thumb: "100x100#",
                               medium: "300x300>",
                               display: "759x506#" }

I currently don't have any pre/post processors or interpolations applied.

我目前没有应用任何前/后处理器或插值。

1 个解决方案

#1

According to the ImageMagick docs you can acheive this with the -extent option, for example:

根据ImageMagick文档，你可以使用-区段选项来实现这个功能，例如:

convert input.jpg -resize 800x600 -background black -compose Copy \ 
-gravity center -extent 800x600 -quality 92 output.

According to the Paperclip docs, you could now add the relevant command line flags to paperclip the following way. For example, for :medium:

根据Paperclip文档，您现在可以通过以下方式向Paperclip添加相关的命令行标志。例如,对于媒介:

has_attached_file :image, :styles => { thumb: "100x100#",
                                       medium: "300x300>",
                                       display: "759x506#" },
                          :convert_options => { all: "-background black -compose Copy -gravity center"
                                                medium:  "-extent 300x300"}