Detects the background color of an opaque image by looking at the color of the 1st pixel, then makes transparent (sets the alpha channel value to 0 for) all the pixels which have the same color as the detected background one (within some tolerance values - see colorTolerance and colorToleranceUniform variables in main.go). Saves the output as PNG.
jpeg, jpg, png, bmp, tiff, gif and webp.
Implemented in golang. To build an executable for your operating system run go build.
/make-image-transparent sample--yellow-on-red--jpg.jpg
It also accepts a second (boolean) argument (true | false). Example:
/make-image-transparent sample--grey-on-white--jpg.jpg true
If true is specified => the image data will also be encoded to a Base64 string and decoded back (this is done just as an example on how to that, in case one needs to work with Base64 encoded images).
Unfortunately this is not supported for webp images as the used library only supports decoding webp image data from Base64, but it doesn't also support encoding it back to Base64.