FilmAnalysisFilmAnalysis · 照片背后的故事
从照片出发，读一段摄影史。故事和照片之间只是阅读上的联想，不代表照片的作者、相机或实际用的胶卷。
1842 年，赫歇尔发明了蓝晒法。纸上涂铁盐溶液，曝光后用清水冲洗，就留下蓝色的影像。
做蓝晒不一定要相机。把叶子或布料直接放在纸上晒，就能得到它的轮廓。蓝晒因此常被用来复制图纸，也用来记录植物。
找一片边缘复杂的叶子，先看外轮廓，再看叶脉。如果只剩下轮廓，哪些特征还能认出来？这是练习看形状，不是在判断某张照片用了什么工艺。
「不妨试试」是编辑设计的练习，不是史实。
故事卡与徽章分开收藏。为照片评分仍按原有规则收集徽章。
FilmAnalysis · Stories behind the frame
Read a little photographic history. These connections suggest ways to look; they say nothing about authorship, cameras or the physical film stock.
In 1842 John Herschel invented the cyanotype. Paper coated with iron salts is exposed to light and washed in water, leaving a blue image.
No camera is needed. A leaf or a piece of fabric laid on the paper leaves its outline, which is why cyanotype was used to copy plans and to record plants.
Take a leaf with a complicated edge. Look at the outline, then the veins. If only the silhouette remained, what could you still recognise? This is practice in reading shape, not a way to identify a process.
"Try this" is an exercise written by the editors, not history.
Story cards have their own shelf. Rating photographs still collects badges under the existing rules.