Possible bug with threshold

[mpavlis]

I am trying to turn all the colors on images to black. I test using two different files, I worked perfectly the other turned everything white. No errors or warnings.

commands I used:
convert test.png -threshold 99% result.png
convert test2.png -threshold 99% result2.png

Images and results here:
https://drive.google.com/drive/folders/ ... G03QXAJImT

[snibgo]

What version of IM? On what platform?

When using "-threshold", I suggest you restrict the operation to the RGB channels.

If you want to make the entire image opaque black, I suggest you use "-fill Black -colorize 100".