Removing image alpha channel is very important operation before you convert an image to pdf. If you do not remove it, the alpha channel will cause to fail. In this tutorial, we will introduce how to remove image alpha channel with ImageMagick in win 10.
Download and install ImageMagick
You can download ImageMagick in here.
https://imagemagick.org/script/download.php
As to win 10, you can select this version.
Open CMD prompt
If you have installed ImageMagick into C:\Program Files\ImageMagick-7.0.8-Q16, then navigate to this folder. In this folder, you will find a magick.exe file.
Remove image alpha channel
You can use convert command to remove.
magick convert image-alpha.png -background white -alpha remove -alpha off image-no-alpha.png
