This project forked from hamal-z/ppbc-scraper
**植物图像库爬虫
最近在做一个课设需要大量花卉植物的图片来做训练集，于是写了一个爬虫，从**植物图像库抓图。
使用前需要在**植物图像库上找到所需植物的种（Species），例如:
被子植物门 Angiospermae >> 白花丹科 Plumbaginaceae >> 白花丹属 Plumbago >> 白花丹 Plumbago zeylanica
找到白花丹种的网址如下 http://www.plantphoto.cn/sp/26094
网址末端可找到sp号26094，这个便是白花丹的唯一标识。
可获取多个sp号后一起爬取，具体设置在ppbc.py文件中可以找到。
scrapy自带缩略图功能，但不是等比例压缩，重写PicscrapyPipeline部分函数，在使用Pipeline爬图的同时用PIL等比例压缩，保存原图和压缩图，图片按编号顺序命名、按花卉名称分文件夹保存。
Scrapy版本： 1.5.0
Python版本：3.6.4
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