![]() So my take is that if you just want to convert to grayscale using some default implementation, use IrfanView, but if you need more flexibility, options, and perhaps want to compose different batch processing actions together, use more professional tool like the one I mentioned. And if you need, it has a host of other image processing functions like brightness, contrast, etc. It is commercial, but allows one to specify how much Red, Green, and Blue contribute, as well as allows one to use Lightness or Intensity "channels" of other color models like HSL and HSI to achieve conversion: Batch Image Processor In addition it has various options for saving grayscale images: 8-Bit Bitmap, 8-Bit PNG, 8-Bit GIF, and some others. However, for those who might want to specify exactly how the colors are to be converted to grayscale I thought I will mention the program I use. You'll have Save ALL item in the File menu (at the very bottom). Filters menu -> Script-Fu -> Update scripts. ![]() Then you don't even have to restart the app. ![]() If you just want to convert to grayscale using default conversion method, IrfanView does the job. Put the file into plugins folder with same extension (on Windows it's C:\Program Files\GIMP 2\share\gimp\2.0\scripts). Even though there is an accepted answer, thought I would give my 2 cents.
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