Scrapy - download images from image url list
<p>Scrapy has <a href="http://doc.scrapy.org/en/latest/topics/media-pipeline.html#using-the-images-pipeline" rel="nofollow">ImagesPipeline</a> that helps download image. the process is </p>

<ol>
<li>Spider: start a link and parse all image urls in response, and save
image urls to items.</li>
<li>ImagesPipeline: items['image_urls'] are processed by ImagesPipeline.</li>
</ol>

<p>But what if I don't need spider parts and have 100k images URLs ready to be downloaded, for example read URLs from redis, how do I call ImagePipeline directly to download the image?</p>

<p>I know I could simply make Request in spider and save response, but I'd like to see if there is way use default ImagesPipeline to save images directly.</p>