Ruby-on-rails Carrierwave - 将图像调整为固定宽度
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Carrierwave - Resizing images to fixed width
提问by David
I'm using RMagick and want my images to be resized to a fixed width of 100px, and scale the height proportionally. For example, if a user were to upload a 300x900px, I would like it to be scaled to 100x300px.
我正在使用 RMagick 并希望将我的图像调整为 100 像素的固定宽度，并按比例缩放高度。例如，如果用户要上传 300x900 像素，我希望将其缩放为 100x300 像素。
回答by iwasrobbed
Just put this in your uploader file:
只需将其放入您的上传器文件中：
class ImageUploader < CarrierWave::Uploader::Base
version :resized do
# returns an image with a maximum width of 100px
# while maintaining the aspect ratio
# 10000 is used to tell CW that the height is free
# and so that it will hit the 100 px width first
process :resize_to_fit => [100, 10000]
end
end
Documentation and example here: http://www.imagemagick.org/RMagick/doc/image3.html#resize_to_fit
此处的文档和示例：http: //www.imagemagick.org/RMagick/doc/image3.html#resize_to_fit
Keep in mind, resize_to_fitwill scale up images if they are smaller than 100px. If you don't want it to do that, then replace that with resize_to_limit.
请记住，resize_to_fit如果图像小于 100 像素，则会放大图像。如果您不希望它这样做，请将其替换为resize_to_limit.
回答by Giang Nguyen
I use
我用
process :resize_to_fit => [100, 10000]
Use 10000or any very big number to let Carrierwave know the height is free, just resize to the width.
使用10000或任何非常大的数字让 Carrierwave 知道高度是免费的，只需调整宽度即可。
@iWasRobbed: I don't think that's the correct solution. According to the link you pasted about resize_to_fit: The maximum height of the resized image. If omitted it defaults to the value of new_width.So in your case process :resize_to_fit => [100, nil]is equivalent to process :resize_to_fit => [100, 100]which doesn't guarantee that you will always get the fixed width of 100px
@iWasRobbed：我认为这不是正确的解决方案。根据您粘贴的链接resize_to_fit：The maximum height of the resized image. If omitted it defaults to the value of new_width.所以在您的情况下process :resize_to_fit => [100, nil]相当于process :resize_to_fit => [100, 100]这并不能保证您将始终获得 100px 的固定宽度
回答by Rafael Vidaurre
Wouldn't a better solution actually be:
更好的解决方案实际上不是：
process :resize_to_fit => [100, -1]
This way you don't have to limit height at all
这样你就不必限制高度了
EDIT: Just realized this only works with MiniMagick, For RMagick you seem to have no option but to add a large number to the height
编辑：刚刚意识到这只适用于 MiniMagick，对于 RMagick，您似乎别无选择，只能在高度上添加一个大数字
