May I ask which interface is used to implement the effect shown in the following figure?

[jueqing1015]

I want to remove the background color of the image in bulk to make it white, but I found that the CleanBackgroundToWhite interface will remove some of the colored parts from the image during cleaning.

[DanBloomberg]

See prog/adaptmap_reg.c.

You'll see pixim, which is a mask over the image part. For the image pat that has the painting, we don't clean to white, just do a TRC using pixGammaTRCMasked().

[jueqing1015]

@DanBloomberg
I don't know why I couldn't produce the correct effect by referring to the code in the example. Could you please use the following image to handle it?

[DanBloomberg]

You can do this. Identify the bounding box of the image. (It was hardcoded in adaptmap_reg.c )
Then use the same approach.