Legacy ImageMagick Discussions Archive

So I have looked all over this forum/stackoverflow/etc and the best IM halftone filter I found was this one:

https://www.imagemagick.org/discourse-server/viewtopic.php?t=18409

The main issue being that it isn't using dots with varying sizes. Then I found this:

http://evanw.github.io/webgl-filter ...

Would this be a correct understanding of it?

convert ~/im/images/logo.gif -set option:distort:viewport '%wx%h+0+0' \
-colorspace CMYK -separate

= There are 4 images on the image stack now, one for each of C M Y K.

null: \

= Use the null image as a delimiter

\( -size 2x2 xc: \( +clone ...

Couple quick questions about encoding PSDs.

1 - Every layer I generate seems to have a "Lock transparent pixels" lock set on it. Is there a way to turn that off for some layers? Can I lock other layers entirely?

2 - Is it possible to replace the thumbnail layer with a completely blank layer? The ...

I am trying to replicate a color halftone effect using the API.

I'm using this command I found on another post on this forum for reference and trying to translate it to API calls but I am not very familiar with the IM command line and am getting stuck.

convert ~/im/images/logo.gif -set option ...