document – Page 2 – Gea-Suan Lin's BLOG

Markdown 轉電子書 (以及實體書) 的工具

看到有人用 Markdown 寫電子書：「How I wrote and published my novel using only open source tools」。

電子書的部份主要是透過 Pandoc 轉換，然後用 Dublin Core Metadata Element Set 提供 metadata。

實體書的部份也還是用 Pandoc 轉換成 ODT，而後面還是拿出 LibreOffice 對 page format 調整：

LibreOffice has many page formatting options that are non-obvious but incredibly important. For example, I wanted the first page of each chapter to be a right page, and to exclude the page header. I defined my chapter heading style to have a “page break before” and set a page style of “first page” (which is a right page without a header), which is followed by “right page”, which is followed by “left page”, which goes back to “right page”.

主要還是 Pandoc 這個工具，找機會來轉些東西看看效果...

Dropbox 的文件掃描功能

算是講 Dropbox 的「Dropbox 的 Document Detecting」這篇的續集，在抓出文件位置後講顏色的校準：「Fast Document Rectification and Enhancement」。

要怎麼把左邊的原始圖轉換成右邊的圖，包括了座標轉換以及顏色校準：

顏色校準的部份講到了這張很有名的圖。在圖片上，A 與 B 的區塊顏色是相同的，但你校準出來的時候必須跟人腦的感覺相同：

Here’s a great illustration of this “illusion,” in which the two tiles marked A and B have the same pixel values, but appear to be very different:

這是最後的成果，左邊是原始圖，中間是將背景改成白色，其他顏色保留，而右邊則是試著修正顏色：

Left: the original image. Middle: an enhanced image, with the background becoming white and the foreground preserved in exact R, G, B values. Note that the colors appear faded. Right: an enhanced image that tries to correct for the perceptual discrepancy.