I have 2 images, imgBlackOnly
and imgRedOnly
as below, which already have the same ImageDimensions
.
I want to paste imgBlackOnly
to cover imgRedOnly
, while the white part of imgBlackOnly
is treated as "transparent" as what we did in the tiny software Paint of Windows. Thus my desired output is imgBlackCoverRed
as below:
But one point to note is, the white part of imgBlackOnly
is not totally white (since it is a screen capture from somewhere else), and therefore we need to force some "nearly white" part to be "totally white" by adding a manual threshold.
How can I do that? Many thanks!
To avoid misunderstanding, I also want to point out that the original picture of imgBlackOnly
is not just black. It has several colors, with a "nearly white" background. Thanks.