create a preset in lua module

[dhmc05]

I want to experiment with applying develop adjustments from a plug-in.  noticed the photo:applyDevelopPreset( preset, plugin ) function.

Question:

Is there a way to create a preset on the fly within the plug-in, for example a preset for  setting the Exposure2012 to +10.

A little piece of code would be appreciated much!

[areohbee]

preset = LrApplication.addDevelopPresetForPlugin( _PLUGIN, "My Groovy Preset", { Exposure2012 = .3 } ) -- no catalog write access required.

photo:applyDevelopPreset( preset, _PLUGIN ) -- catalog write access required.

Note: develop preset will be applied at Lr's leisure in the background (after returning from catalog write access method), so if you are depending on preset settling in, you need to add some logic after applying.

Beware: assuring auto-toned values have settled, so you can make adjustments to auto-toned values, is particularly problematic. There are similar problems with auto/custom white-balance, lens corrections, ...

[dhmc05]

Rob, THANK YOU!!!!!!!!!

Great,this is awesome!

[pisu86]

Hi guys im working on my first plugin, excuse me my poor knowlage. i use code

"

local function setPreset () 

  local LrApplication = import 'LrApplication'

  local catalog = LrApplication.activeCatalog()

  catalog:withWriteAccessDo( 'setPreset', function()

   local preset = LrApplication.addDevelopPresetForPlugin( _PLUGIN, "___Dummy___", { Exposure2012 = 1.2 } )

   photo:applyDevelopPreset(preset, _PLUGIN)

  end)

end

"

i recive error :

attemp to index global 'catalog' a nil value.

why is that happening?

[johnrellis]

Is that the complete script you're executing, or is it an excerpt?  The error you're getting, "attemp to index global 'catalog' a nil value", wouldn't arise from the code fragment you posted.   Without seeing a complete script, it's hard to know what's going on.

[pisu86]

thank you for your response John

yes, thats all i have, What else i should include in code? sorry for beeing nooby

[areohbee]

If you were expecting catalog to be available upon return from the function posted - it won't be: function's locals are out of scope in context external to the function where they're declared, so catalog will be expected in the global environment instead (everywhere but inside that function), but it's not - thus the error, probably.

-- in other words:

local catalog

local function yada()

  catalog = LrApplication.activeCatalog()

end

yada()

LrDialogs.message( tostring( catalog ) )

-- works, whereas

local function yada()

  local catalog = LrApplication.activeCatalog()

end

yada()

LrDialogs.message( tostring( catalog ) )

-- will give the error you're getting

Either that, or there was a typo somewhere...

PS - you may want to spend some more time reading that lua manual .