yualbert 寫:
RolLeica 寫:
yualbert 寫:
RolLeica 寫:
謝謝albert師兄,黑白現階段是玩玩吓,我先試+1EV至+2EV,(減少曝光)看看能否補償over-developed
不用客氣,你話減少曝光,那麼應是-EV not +EV喎,至於你甘做得嗎?等我幫你問下高手先....
相機設定 -1EV是 減了 1個曝光值. yes ok
* * * * * * * *
但如果我的手持測光表定義:
10EV
+2EV=12EV , 12EV 比 10EV :
減 少了2個曝光值, 係咪好煩
問了李紀平老師(Keeping Lee),他說under來影理論上是可以補救over的develop,但關鍵又係要under幾多呢?除非知道over-develop了幾多(但也不能under太多影)....而實際上對於已developed的B&W film,是可以用一種藥水去救(re-build)的 (sorry, don't know how to spell the name of that stuff),但祗是有限度地re-build....
對於under影幾多,似乎要試,並每次用相同的菲林及到相同的lab去做,但這也要假設間lab每次都用相同冲的時間及藥水的藥性是相同....唔....似乎幾難!
Why hassel?
simply ask the lab. pull one stop to keep the highlight.
Under-exposre+over-deveop ---> loss of shadow detail, poor mid-tone separation.
引言回覆:
後來買了些書看,
原來反差低的環景,可以减少曝光,增加顯影時間改善(等於谷冲),
反差高則相反,不同菲林又不同特性,又什麽暗位曝光,高位顯影,
都好煩o下,所以要自已慢慢試. Embarassed
wrong concept!
push processing =/= expansion
增加顯影 is a way of controlling contrast (usually under-exposre 1/3 to 2/3 step)
谷冲 is a way of getting a usable mid-tone (under-exposre 1~2 steps)