Legacy ImageMagick Discussions Archive

how to set the top png file's opacity when it is composed on top to the background png file? like the same work in PS.

the command line below can set the opacity for top png when "-compose dissolve" :
convert 1.png 2.png -alpha on -compose dissolve -define compose:args=50 -composite hello.png

but there is no use when "-compose overlay" :
convert 1.png 2.png -alpha on -compose overlay -define compose:args=50 -composite hello.png

refer to this post:
viewtopic.php?f=1&t=17503&p=65756&hilit=opacity#p65756

source psd file description:


source png files:



my code: result: hello.png


the result is the same with the 1.png? why

On windows you do not escape the ( ) with \, just use the parenthesis alone. Please read http://www.imagemagick.org/Usage/windows/

Thanks ,and why can not i create the right result using this code?

convert 1.png ( 2.png -alpha set -channel A -evaluate set 40% ) -compose overlay -composite hello.png

try

convert 1.png ( 2.png -alpha set -channel A -evaluate set 40% ) -compose over -composite hello.png

You must have a space after ( and before ).


This works for me on my Mac/Unix system and looks similar to your PS result:

convert 1.png \( 2.png -alpha set -channel A -evaluate set 40% \) -compose over -composite result.png

convert 1.png ( 2.png -alpha set -channel A -evaluate set 40% ) -compose over -composite hello.png

result still as the same as 1.png
I made sure that space before and after ( ) ,the code is compeletely copyed from your code.

seems many problem running at my end ....

what version of IM are you using?

identify -version

run the command line in a command window by typing or pasting and not from a Bat file.

So,finally, it must be the problem with my text editor "notepad++".
by the way, what is the time at your end now? for sometimes i post probems at daytime but no one reply.

I am on the west coast of the US and the time now is 9 PM (GMT-8).

Thanks a million , now is 1 pm at my end.