Batch adjust image brightness and contrast with GIMP 使用 GIMP 批次調整圖片亮度、對比

GIMP is a free image process software, it also have many plugin to batch edit images automatically.
GIMP 是一個免費的圖片處理軟體，還擁有許多外掛可以批次處理圖片。

Step 1. Go to "Script-Fu Batch Color and Contrast" plugin web site http://registry.gimp.org/node/23499 and download script http://registry.gimp.org/files/batch-color-contrast.scm

步驟一. 到 "Script-Fu Batch Color and Contrast" 外掛網址 http://registry.gimp.org/node/23499 並下載腳本 http://registry.gimp.org/files/batch-color-contrast.scm。

Step 2. put the batch-color-contrast.scm in scripts folder, for example \PortableAPPs\GIMPPortable\App\gimp\share\gimp\2.0\scripts if your GIMP is portable version.

步驟二. 將 batch-color-contrast.scm 放在 GIMP 的腳本目錄，
如果是可攜式版本的 GIMP，就放在 \PortableAPPs\GIMPPortable\App\gimp\share\gimp\2.0\scripts。

Step 3. Open GIMP, click File -> Create ->MISC -> Batch Color Balance and Contrast.
步驟三. 打開 GIMP，點擊 File -> Create ->MISC-> Batch Color Balance and Contrast。

Step 4.Choose the image folder and type you want to process.
Make sure "Make changes to Brightness and Contrast" is checked then drag or input scale.
After press OK button, you will get processed image files with prefix '_' in the same folder.

步驟四. 選擇要處理的圖片目錄與類型。
確認有勾選 "Make changes to Brightness and Contrast" 後即可拖拉或輸入修改值。
按下 OK 按鈕後，就可以在同目錄下得到處理後的檔案，這些檔案前置 _檔名。