Questions and postings pertaining to the development of ImageMagick, feature enhancements, and ImageMagick internals. ImageMagick source code and algorithms are discussed here. Usage questions which are too arcane for the normal user list should also be posted here.
suman114
Posts: 13 Joined: 2016-04-17T23:51:39-07:00Authentication code: 1151
Post
by suman114 2016-04-17T23:56:55-07:00
I am trying to add water mark as follows. But the image is fully solid. Can I make it semi-transparent or have some opacity?
The command is follows.
Code: Select all
convert file/location.pdf null: logo.png -gravity center -quality 100 -fill "rgba(180,180,180,0.80)" -pointsize 18 -weight bold -annotate +0+50 'Something Stupid here' -compose multiply -layers composite destination.pdf
Can anyone help me pipe composite to this or fix this command?
snibgo
Posts: 12159 Joined: 2010-01-23T23:01:33-07:00Authentication code: 1151Location: England, UK
Post
by snibgo 2016-04-18T06:36:04-07:00
Which image is the watermark you want to make transparent? If it is logo.png, then:
Code: Select all
convert file/location.pdf null: ( logo.png -alpha set -channel A -evaluate Multiply 0.8 +channel ) -gravity center -quality 100 -fill "rgba(180,180,180,0.80)" -pointsize 18 -weight bold -annotate +0+50 'Something Stupid here' -compose multiply -layers composite destination.pdf
If using bash, escaps the parentheses like this: \( \).