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I look for a tool, most desirably open source or Free software, that can run on Windows 10 and has a GUI, that can take X number of images (definitely more than 5) and just add Alpha channel to all these images, and delete their (say White) background, as well as changing their extension to .png so that the change could surely take effect.

AFAIK, the program GIMP can do it per one image, so, I need something that can, most probably dedicated for this cause.

  • You could always add a script to GIMP so as to be able to do in to each image quickly or you could use Image Magick to do it without the command line. – Steve Barnes Feb 14 '16 at 15:32
  • Not tried it myself, but as you mention Gimp: you know it has a batch mode as well? – Izzy Feb 14 '16 at 15:34
  • If you would like, you could publish a question & answer with an explanation here or in Super User here in StackExchange. I will be glad to accept & Thumb up if it worked to me since I also use GIMP. I won't be the only 1 to thumb up I guess... – JohnDoea Feb 14 '16 at 18:58
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You can do this with IrfanView.

Try Batch Conversion/Rename... from the File menu as explained in this forum.

An then use this for the transparencies:

  • Select as "Output format" PNG
  • Go to "Options" and select there
  • Save Transparent Color
  • Save Transparency as Alpha Challe

After that you can decide if you want to click on every Picture to select the color or you can use the Option

  • Use main windows color for transparency

Screenshot Options

  • Have you tried "Use main windows color for transparency" ? – f4bi4n Mar 7 '16 at 11:28
  • I was confused, I couldn't check it when unchecked save transparent color, now it's fine thanks. – JohnDoea Mar 7 '16 at 11:46

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