Legacy ImageMagick Discussions Archive

I'm trying to do something that feels like it should be fairly straightforward but I'm getting into a mess....

I need to take old.png, resize to 400x400, and overlay a watermark (wmark.png), to create new.png.

This works: However, I would like to control the opacity of the overlaid wmark.png and I can't see how to do that.

Feel free to throw away what I have already! I've struggled to achieve both the resize and the overlay in one step.

Have you tried -watermark
To combine both you will need to "pipe" the result of one to the other with something like ( this probably will not work as is ! ):

Bonzo wrote:Have you tried -watermark

I have but I've never got the hang of it.

Bonzo wrote: To combine both you will need to "pipe" the result of one to the other with something like ( this probably will not work as is ! ):

Code: Select all

convert input.jpg -resize 500x500 miff:- | composite -watermark 30% -gravity center watermark.png - output.png

[/quote]

It's a great starting point, as it does work!

However, I'm not sure what criteria define a suitable wmark.png when using this method, as the results are poor with the watermark image I am using. If I remove the -watermark I get similar results as I was getting before, I'm just still stuck on the opacity of the watermark.

Experimenting a little more, however, gets me something which does work using -dissolve: So thanks for your method, it got me there in the end!

Annotating, Watermarking Images..
http://www.imagemagick.org/Usage/annota ... termarking

This is one of the oldest set of Examples in IM Examples!