我基本上想要做的就是使用jcrop裁剪图像，然后使用这些尺寸，将图像旋转 -30 度并保存缩略图。然而，由于旋转后不涉及缩放，rmagick 会创建额外的像素。我想知道如何实现这一目标。
# 150 x 150 is the final cropped image I want for my thumb(nails)
# :croppable is a file I use that takes the original and adds white padding in a 1200x1200
# file size so I can actually crop with white space available (you can't crop outside the
# original dimensions of the file)
has_attached_file :photo, :styles => {
:thumb => { :geometry => "150x150#", :format => :jpg, :processors => [:cropper] },
:general => ["150x375", :jpg],
:show => ["x425", :jpg],
:croppable => ["1200x1200>", :jpg]
},
:url => "/assets/w/:style/:w",
:path => ":rails_root/public:url",
:default_url => ":w_default",
:default_path => ":rails_root/public:w",
:default_style => :show,
:convert_options => {
:thumb => '-gravity center -rotate -30',
:croppable => '-gravity center -extent 1200x1200',
:general => '-gravity center -extent 150x375 -quality 95',
:all => '-quality 100 -antialias -flatten -background white -interlace Plane -unsharp 0.3x0.3+5+0'
},
:processors => [:thumbnail, :compression]
我最终想要做的是通过 css 变换旋转预览图像，以便预览实际显示裁剪后缩略图的样子。在这一点上，当涉及到回形针保存缩略图并旋转它时，我不确定如何获得我想要的东西。