download_image_url: download image of the image column
In shizidushu/hfun: R Functions in use

download image of the image column

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download_image_url(df, df_image_title_col_name, df_image_url_col_name,
  lsp_label = "LSP", image_file_extension = ".JPG",
  image_path = "~/images")

`df`	a tbl or dataframe
`df_image_title_col_name`	the colname of the image title (usually the sku)
`df_image_url_col_name`	the colname of image url column
`lsp_label`	the common label of lsp (linshi product); There is no image for lsp
`image_file_extension`	the file extension of the image
`image_path`	where the image locates; default to ~/images