如何裁剪然后使用回形针调整大小 [英] How to crop and then resize with Paperclip

问题描述

我有一张照片附件，正在使用回形针保存。但是，我想先对照片进行处理，然后再进行裁切，然后再调整为最终尺寸，以进行保存：例如
我有一张900x900的照片，我想先对500x500进行中心裁剪，然后将裁剪后的照片缩小为缩略图尺寸100x100。

I have a photo attachment which I'm saving using Paperclip. However, I'd like to process the photo first before saving by cropping it down and then resizing to the final size: e.g. I have a 900x900 photo, I want to first do a central crop to 500x500, and then resize the cropped photo down to a thumbnail size of 100x100.

这样一来，缩略图就不会只是900x900的缩小版本，因为它可能太小而无法在照片中分辨出来。通过裁切，我们减少了照片中可以忽略的一大部分，并且仍然具有有意义的缩小缩略图。

The purpose of this is so that the thumbnail image wouldn't simply be a scaled down version of the 900x900 since it might be too small to even make out anything in the photo. By cropping it, we reduce a huge part of photo that can be left out and still have a meaningful scaled down thumbnail.

我知道回形针可以裁切或调整大小，

I know paperclip can do either crop or resize, but is there a way to combine both?

编辑：为澄清起见，我并不是要创建一个裁剪器工具，用户可以在其中进行交互并裁剪图像。对于上载的每张照片，我要统一进行裁剪，然后调整大小。

To clarify, I'm not trying to create a cropper tool where the user can interact and crop the image. For every photo that is uploaded, I want to uniformly perform a crop followed by a resize.

谢谢

推荐答案

可能有更好的方法，但是，如果您使用ImageMagick，则此方法可以正常工作。

There's probably a better way of doing this, but if you're using ImageMagick this way works fine.

以下将首先在图片的中心以500x500的比例裁剪，然后将其他所有东西都扔掉，然后将新图片的尺寸调整为100x100。

The following will first crop in the center of the image at 500x500, then throw everything else away, then resize that new image back down to 100x100.

has_attached_file :image,  
  :styles => { :thumb => "" },
  :convert_options => { 
    :thumb => "-gravity Center -crop 500x500+0+0 +repage -resize 100x100^" },
  :default_style => :thumb

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