tag:blogger.com,1999:blog-52876922782343707442024-02-07T14:59:09.692-08:00Barry's Blogger熱愛攝影,喜歡大自然。
沉迷星野攝影,尤其對超現實主義的題材情有獨鍾!Anonymoushttp://www.blogger.com/profile/02839141049162121680noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-5287692278234370744.post-67389794970864299852016-09-29T10:26:00.002-07:002018-11-13T00:00:50.993-08:00執銀河相教學拍攝銀河,與其他拍攝題材有點不同,它後期執相不會比前期小,<br />
特別是充斥光污染下拍攝的銀河相。<br />
現在就讓我講解一下我是如何處理執相的部份。<br />
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<span style="color: #1d2129; font-family: "helvetica" , "arial" , sans-serif; font-size: 13px;">拍攝日期: 2014-8-16 (21:37)</span><br />
<span style="color: #1d2129; font-family: "helvetica" , "arial" , sans-serif; font-size: 13px;">焦段: 28mm</span><br />
<span style="color: #1d2129; font-family: "helvetica" , "arial" , sans-serif; font-size: 13px;">光圈: f4</span><br />
<span style="color: #1d2129; font-family: "helvetica" , "arial" , sans-serif; font-size: 13px;">iso: 3200</span><br />
<span style="color: #1d2129; font-family: "helvetica" , "arial" , sans-serif; font-size: 13px;">曝光: 20 sec.</span><br />
<span style="color: #1d2129; font-family: "helvetica" , "arial" , sans-serif; font-size: x-small;">器材: 5D mark III + 16-35 F/4 IS USM</span><br />
<span style="color: #1d2129; font-family: "helvetica" , "arial" , sans-serif; font-size: x-small;">拍攝地點: 大拗門</span><br />
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<span style="background-color: black;"><span style="color: white;">所用軟件: Photoshop CS6</span></span><br />
<span style="background-color: #cccccc;">註: command (Mac) = Ctrl (Windows)</span><br />
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1.首先把RAW檔案拉到Photoshop裹開啟會出現這個版面。<br />
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2.一般色溫會設定較低/冷的K數(~4000K),除了<b><span style="color: #cc0000;">showdows會調高一點</span></b>,其他都不動(包括Tone Curve、Detail、HSL/Grayscale、Split Toning、Lens Corrections、Effects、Camera Calibration),然後按視窗右下方的"<b><span style="color: #cc0000;">Open Image</span></b>"開啟。</div>
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3. 這教學最常的工具是Layers(圖層)、Chanels(色版),所以最好執相之前已放在PS介面中。(Windows-> Layers / Windows-> Chanels)</div>
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<span style="background-color: white;"><b>4. 執銀河通常分開兩部份執:一個是後景(銀河);一個是地景(前景)。</b></span></div>
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<span style="background-color: orange;"><span style="font-size: medium;">=========== 後景(銀河)部份 ===========</span></span></div>
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5. 首先我們會處理銀河的部份,按下keyboard "command+J" 複製一個圖層。</div>
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6. 按 "command+M" 彈出Curves(曲線)的視窗,然後點左下角的"手指"圖示(如圖)</div>
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7. 利用Mouse找銀河最<span style="color: #cc0000; font-weight: bold;">深</span>與最<b><span style="color: #cc0000;">淺</span></b>的顏色,找到時<span style="color: #cc0000;">點擊游標</span>確認,同時Curves視窗會出現一個圓點,它就是你剛找到的最深/最淺的位置。</div>
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8. 加大銀河的對比度。</div>
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9. 這時會發現右下方太多光害。</div>
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10. 按下keyboard "command+J" 再複製一個圖層</div>
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11. 按下keyboard "command+M" 點選一個光害的位置,往下拉(推暗),然後"OK/確定"。</div>
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12. 在Layer (圖層) 工具,點選"Add layer mask"加遮色片。(如圖)</div>
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13. (A) 選取"Gradient Tool"(漸變工具),</div>
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(B) 前景(foreground)為白色;背景(background)為黑色。</div>
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(C) 利用mouse由畫面右下角拉到左上角。</div>
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14. 天空的光差平均了一點。 </div>
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15. 點選最頂的layer,按下keyboard "command+E"合併下方的layer(圖層)</div>
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<span style="color: red;">或者</span> ( Layer工具(A) ->右上角icon(B) ->"Merge Down"(C) )</div>
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16. (A) 按下keyboard "command+J"複製一個圖層。</div>
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(B) 然後"command+M",用Curves再拉大銀河的對比度 (請參考<b style="color: #cc0000;">步驟</b><span style="color: #cc0000;"><b>7-8</b></span>)</div>
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(C) 選用curves的"Channel" -> Blue (因為圖偏藍)</div>
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(D) 向下拉減藍色。</div>
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P.S.: 每張相的數據不一樣,所以不能作準。</div>
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17. 在頂的圖層加"mask"(遮色片) (<b><span style="color: #cc0000;">與</span></b><b><span style="color: #cc0000;">步</span></b><b><span style="color: #cc0000;">驟12相同</span></b>)</div>
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18. (A) 選取Brush (筆刷)工具, </div>
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(A2)筆刷選用"Soft Round"</div>
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(A3)透明度=100% ,流量值=100%</div>
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(B) foreground (前景)要選黑色 (R=0 , G=0 , B=0)</div>
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(C) 放大筆刷,筆刷要整個畫面的4/10(大約),然後在暗區域填畫。</div>
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<span style="color: #cc0000;"> </span> (C2) 填黑的範圖代表"清除/Del",將畫面暗黑的局域"清除",就會透出下方的圖層。填畫時在圖層的遮色片會顯示你剛剛畫的範圍。(快捷鍵"\",都會有顯示;再按"\"取消顯示)</div>
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P.S.: </div>
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-簡單D講,Mask/遮色片的用法是: 黑色=清除;白色=顯示</div>
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-使用Mask時,利用mouse點擊"Mask"內的白框,如使用中,有個白色框框住<span style="color: #cc0000;">(C2)</span>。</div>
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如跳出Mask,點選Mask框框左邊的縮圖便可以。</div>
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-Mask用法在這裏再多說,如不明白可以在google搜尋"photoshop mask 教學"。</div>
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19. 按下keyboard"Command+E"合併下方圖層,再"Command+J"複製一個圖層。</div>
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20. 按下keyboard"Command+M" 再進一步強化銀河的對比度。<span style="color: #cc0000;">(<b><span style="color: #cc0000;">請參考步驟:7-8</span></b>)</span></div>
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21. 按下keyboard"Command+E"合併下方圖層。 再"Command+J"複製一個圖層。</div>
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22. 按下keyboard"Command+M"開Curves工具。</div>
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23. 利用Curves工具,再減底右下角的光害。<span style="color: #cc0000;">(</span><b style="color: #cc0000;">請參考步驟:7-8</b><span style="color: #cc0000;">)</span></div>
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24. 按下keyboard"Command+E"合併下方圖層。</div>
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25. 按keyboard "command+U" 開啟"Hue/Saturation"(色相)</div>
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(A) Master -> (B) Yellows(黃色)</div>
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Saturation數值set"-36" (減飽和度)</div>
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<span style="background-color: orange; font-size: medium;">=========== 前景部份 ===========</span></div>
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25. (A) 點選background圖層後,"Command+J"複製圖層 (background copy)</div>
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(B) 將"background copy"拖曳到頂部。</div>
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26. 在左邊工具列,點選"Quick Selection Tool"。 </div>
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27. 利用"Quick Selection Tool"工具,將"前景"範圍勾出。</div>
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技巧: 沿著邊緣勾出就可以。顏色對比越大,越容易勾出,效果越好。</div>
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28. Select -> Modify -> Feather(羽化工具) </div>
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29. 數值set"5" ,然後"OK"確認。</div>
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P.S.: </div>
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1. 作用是柔化邊緣位。</div>
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2. Set的數值越大,柔化程度越大。</div>
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3. 隨著相片不同象素,set的數值都不同。 (本作品為2,230萬像素)</div>
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30. 選取完後,在"Layer"工具,點選 "Add layer mask"。(退地)</div>
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這時會露出底下的圖層。(剛剛執好的銀河部份)</div>
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31. (A) 在置頂的Layer,按"command + G"合併</div>
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(B) 將"Mask"拉到"Group"的圖層</div>
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32. (A) 點選"Background copy"圖層</div>
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(B) "command + J"複製圖層</div>
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33. 按"command+M",利用Curves工具,將地景的對比度加強。<span style="color: #cc0000;">(</span><b style="color: #cc0000;">請參考步驟:7-8</b><span style="color: #cc0000;">)</span></div>
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34. 在左邊介面選取"Rectangular Marquee Tool" 工具,框出「前景」和「後景」之間的範圍。(如圖) </div>
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35. Select -> Color Range </div>
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36. 用mouse點選對比顏色較大的位置。然後在"Color Range"中的"Fuzziness"set"190"(參考數字),然後"OK"確認。</div>
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37. 確認完後,畫面會出現很多虛線。為勉畫面太花,我們按"command+H"隱藏了剛剛選取的範圍。</div>
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38. (A) 選取然mask的範圍。然後在用白色筆素畫在前景(樹/山)的位置。</div>
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(B) 按下快捷鍵 shift+command+I (windows = shift+ctrl+I) 反選取,黑色筆素畫就可以將天景素畫。就可以自然地分開天景與地景。</div>
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技巧: 放大畫面,同時縮小筆刷會素畫。</div>
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p.s.: 快捷鍵:" \"可以顯示當前Mask畫的範圍。還原再按"\"一次就可以。(如圖)</div>
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39. 完成圖。</div>
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後記: 星野攝影除了要將銀河突出/強化之外,懂得如何處理銀河與前景融合是更為重要的。</div>
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