用Gimp製作Spotlight效果－Shenk

聚光燈效果

我還蠻喜歡的一個修圖方法
功用在於凸顯圖中的某一部份
右圖是示範如果要對別人解釋RSS時，可以用此方法強調RSS部份。

以前是一步步作...
最近逛到有關寫Script給gimp的網頁時試著寫的

預設值原本設定為陰影程度60%，因為以前用這個數值做出來的結果看起來頗順眼
但是在寫這隻Script時突然覺得這數字好熟悉
對...就是$\frac{\sqrt{5}-1}{2}=0.6180339$...
也就是黃金分割= =a...
嘛...那就取與int最近的值,62吧...
反正爽就好嘛...XD

把下面這一段放到"~/.gimp-2.4/scripts/spotlight.scm"
安裝完後功能顯示於 "圖層/Spotlight"

(define (script-fu-selection-spotlight image scale)
  (let* ((newlayer
    (car (gimp-layer-new image
      (car (gimp-image-width image))
      (car (gimp-image-height image))
      (car (gimp-drawable-type
         (car (gimp-image-active-drawable image))
           )
      )"Spotlight" scale NORMAL
         )
    )
        ))
    (gimp-drawable-fill newlayer BG-IMAGE-FILL)
    (gimp-image-add-layer image newlayer 0)
    (gimp-layer-add-alpha newlayer)
    (gimp-edit-clear newlayer)
  )
)

(script-fu-register "script-fu-selection-spotlight"
  _"Spotlight"
  _"Add a layer as a spotlight lightting on selection"
  "Shenk"
  "Shenk"
  "2008 9/19"
  "*"
  SF-IMAGE       "Image"      0
  SF-ADJUSTMENT _"Scale (%)" '(62 0 100 1 10 0 0)
)

(script-fu-menu-register "script-fu-selection-spotlight"
                         "<Image>/Layer")