Legacy ImageMagick Discussions Archive

I guess '-evaluate set 75%' is applying only to alpha channel because of '-channel A'. Why not?
How can I 'multiply opacity by 0.75'? Something like this? Is it equivalent for 'normal' blend mode of Photoshop? I need such mode.

I'm trying to compose two images after changing opacity for one of them (created by Photoshop CS 5.5). But result is strange.
My file has transparent background. I saved it as 'png-24'.
Note appeared white background.
Please, help — what am I doing wrong?

convert logo: \( water3.png -alpha on ...

I'm trying to store -draw option into a variable in my bash script.

Code:
#!/bin/bash

# this check is just an example of usage
if [ 1 -eq 1 ]; then
text="-draw \"fill #ffffff text 0,9 'Hello world!'\""
else
text=""
fi

echo $text
echo '= = ='
convert logo: $text -verbose result.png
echo ...