Multi-layer filter

[Abraham_Martin]

It's possible to make a multi-layer filter plugin? The idea is: the user has open a multi-layer document, then execute the plugin and selects N layers of the document in the filter UI,  and when clics "OK", the plugin create a new layer adding every selected layer pixel by pixel.

LAYER A             LAYER B                      RESULT LAYER

0 0 5 5 5                1 1 2 1 1                           1 1 7 6 6

0 0 0 5 5       +       1 1 3 1 1            =             1 1 3 6 6

0 0 0 0 5                1 2 3 2 1                           1 2 3 1 6

Any advice?

Thanks!

[ilvar]

You'll probably have to use a combination of automation and filter plugins wrapped into a single SuspendHistory call: e.g. create a new layer from the automation, run your GUI, run filter and read/write the actual pixel data from there.

[Chris Cox]

You haven't told us exactly what you're trying to do, but What you described could also be done via a layer stack plugin.

[Tom Ruark]

A filter plug-in can read from any layer using the channel ports suite. See the Poor Mans Type Tool example. A filter plug-in can only write to the active layer. You cannot add a layer from a filter plug-in. You would need the auto/filter combo as Chris talks about. See the autofilter/hidden combo example or the format/auto for importing text files example.