Cannot apply watermark to GIF

[smantscheff]

I'm trying to add a watermark stamp to a gif image. I have a script which works fine for JPGs:

Code: Select all

composite -gravity south -geometry +0+10 stamp.png  %1 %2

But when applied to GIF files they result in a grey only bitmap. I tried to convert stamp.png to stamp.gif first, but to no avail.

Input looks like that:
Image:

Stamp:


IM runtime is ImageMagick 6.7.1-0 2011-07-06 Q16 (Windows 7) and ImageMagick 6.5.7-8 2010-12-02 Q16 (Ubuntu). Result is the same on both:

How can I apply this watermark to the image?

[fmw42]

jpg does not support transparency. you would likely need to flatten your transparent image with some background color first. Or save your output as png or gif or tif

[smantscheff]

Or save your output as png or gif or tif.

This is what I am trying. Input is GIF and PNG, output is GIF. But the merging of the two yields bad results.

[fmw42]

try this, it works for me. note your large image has two frames and a virtual canvas. use +repage to remove the virtual canvas and use just the first frame.

convert zahnarzt1.gif[0] stamp.png +repage -gravity south -geometry +0+10 -compose over -composite result.gif

[anthony]

Also see Animation Modifications
http://www.imagemagick.org/Usage/anim_mods/#annotating
And Image Annotation, Watermarking
http://www.imagemagick.org/Usage/annota ... termarking

Fred however is right you have two frames with slight differences in 'dithering', Especially in E-Dither 'speckle' on the Ken Doll's pants. But no real animated differences between the two frames.

For more help more detail of what you want to achieve is needed.

[smantscheff]

Thanks for your help, it worked.
Someday I will be grown up and understand all this - or at least some of it.