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How to change the background color of a photo from blue to white?

You can use photoshop software for the following processing:

1, first open the PS software, and then open the picture to be processed in PS.

2. Next, press the shortcut key "Ctrl+j" to copy the background layer to avoid damaging the original image in the later operation.

3. Then select Select-Color Range in the toolbar above, use the eyedropper tool to absorb the blue part of the picture, increase the color tolerance, and click OK.

4. Next, change the foreground color to white and press the shortcut key "AIT+delete" to fill in.