Is there a way to transparent a picture?

[tireless]

For example,make this picture transparent (the black color):


test.jpg

I had tried:

Code: Select all

nconvert -transpcolor 0 0 0 -o %_new.jpg test.jpg

but didn't work.so,"-transpcolor" is used for what?

[xnview]

test.jpg

I had tried:

Code: Select all

nconvert -transpcolor 0 0 0 -o %_new.jpg test.jpg

but didn't work.so,"-transpcolor" is used for what?

It's to set transparency for 8bits colormap picture

[tireless]

It's to se transparency for 8bits colormap picture

do you mean this:

1.

Code: Select all

nconvert -colors 8 -o %_8.png test.png

2.

Code: Select all

nconvert -transpcolor 0 0 0 -o %_new.png test_8.png

[xnview]

For example:

Code: Select all

nconvert -colors 256 -transpcolor 0 0 0 -o %_256.png test.png