ImageMagick on iOS: Blurring and blending an image with itself?

I think the effect you are looking for can be found in the ImageMagick compose examples in the "Softened Blurring" section.

I think the effect you are looking for can be found in the ImageMagick compose examples in the "Softened Blurring" section. Convert face. Png -morphology Convolve Gaussian:0x3 face_strong_blur.

Png convert face. Png face_strong_blur. Png \ -compose Blend -define compose:args=60,40% -composite \ face_soft_blur.

Png Looks like this.

Thanks! Great example. I tried this before though, but could not get the -morphology option to work.

Perhaps the version is outdated...? – Pedery Dec 3 at 3:57 convert --version yields: Version: ImageMagick 6.7.3-1 2011-12-01 Q16 imagemagick.org Copyright: Copyright (C) 1999-2011 ImageMagick Studio LLC this was installed via MacPorts as of an upgrade to Lion I did yesterday. So, it's probably pretty new. – zot Dec 3 at 6:16 I get: convert --version Version: ImageMagick 6.2.8 10/06/10 Q16 file:/usr/share/ImageMagick-6.2.8/doc/index.

Html Copyright: Copyright (C) 1999-2006 ImageMagick Studio LLC. However, from the website I get: The "-morphology" operator (basic methods) and the initial set of kernels was added to ImageMagick version 6.5.9-0 by myself, while I was on a vacation in China. December 2009 to January 2010.

However it is posible to perform simplified 'square' kernel morphology using the older and closely related "-convolve" method. See Alternative Basic Morphology Techniques below. – Pedery Dec 3 at 6:25 Could you btw tell me how to create your above command using -gaussian-blur instead of -morphology, plus write it as a single command?

That would be extremely helpful and I'd be happy to mark your answer as accepted. – Pedery Dec 9 at 4:47.

An older tutorial on this technique (here) suggests lightening the blurred layer and blending in Multiply mode. I expect that darkening the blurred layer and blending with Screen would also work. Don't use a standard 50/50 blend - it doesn't have the same glowing appearance.In your sample, the shadows of the processed image are lighter.

Multiplying can only make an image darker, so I'm guessing they took the darken-Screen approach.

Thanks for the reply. I created the images of Kate Winslet just as described in the question, using Paint.Net. The top layer was blurred with a 10px radius, and the entire layer given 50% opacity.

The layer mode was "normal", but this is AFAIK not an option in IM. Then the layer was merged with the layer underneath. My problem is that no matter what I try, the pixels are not blended in the same way in Paint.Net and IM.

Any suggestions? – Pedery Dec 1 at 22:50 The ImageMagick equivalent of "normal" is blend. Documentation: imagemagick.

Org/Usage/compose/#blend – japreiss Dec 1 at 23:48 Thanks, then this mode works different than the "normal" blending mode in Paint. Net since the images tend to be brighter or darker no matter what option I use... – Pedery Dec 3 at 3:56.

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