[darktable-dev] Lua write_image error

[Jozef Dassen]

Hello,

 

I have been working on a Lua workflow module for my darktable.

My first ever Lua program and I did a lot of copy/paste/modify, but also a lot of trial and error.

I managed to do almost everything I wanted except one thing I can not get to work:

I want to output a jpg image.

I could not find any example, but reading the docs I thought that this is how it should be.

But it does not work.

I do not understand the error message. Where does it expect a dt_imageio_module_format_t ??

I would have thought that imageIOJPG is a subclass of dt_imageio_module_format_t and it does appear

to have a write_image method from the debug output...........

Anybody can tell me what I am doing wrong ??

 

Thanks,

 

Jozef Dassen

 

 

Code fragment:

 

-- Get the images in a table

imageTable = dt.gui.selection()

-- walk through the images and write the JPG:

for k, v in pairs(imageTable) do

  if type(k) == 'number' then

    print("Create Output for ", v, type(v))

    local imageIOJPG = dt.new_format("jpeg")

    local imageFilename = "/nas01/data/Photo Archives/Darktable Sessions/test02/darktable_exported/test_image.jpg"

    print(imageIOJPG, imageFilename)

    debug.debug = true

    print(debug.type(imageIOJPG), debug.type(v))

    print(debug.dump(imageIOJPG))

    imageIOJPG.quality = 85

    imageIOJPG.max_width = 2500

    imageIOJPG.max_height = 2500

    imageIOJPG.write_image(v, imageFilename, false)

  end

end

 

 

 

Console error:

 

 

498.725616 LUA ERROR : /home/dassen/.config/darktable/lua/examples/sessionTool.lua:962: bad argument #-1 to 'write_image' (dt_imageio_module_format_t expected)
stack traceback:
	[C]: in ?
	[C]: in field 'write_image'
	/home/dassen/.config/darktable/lua/examples/sessionTool.lua:962: in function </home/dassen/.config/darktable/lua/examples/sessionTool.lua:929>
	[C]: in ?

 

 

Print statements output:

 


Create Output for 	/nas01/data/Photo Archives/Darktable Sessions/test02/Selects/_D8C6959.NEF	userdata
dt_imageio_module_format_data_jpeg (0x7f0fe803d338)	/nas01/data/Photo Archives/Darktable Sessions/test02/darktable_exported/test_image.jpg
dt_imageio_module_format_data_jpeg	dt_lua_image_t
toplevel (userdata,dt_imageio_module_format_data_jpeg) : dt_imageio_module_format_data_jpeg (0x7f0fe803d338)
   name (string) : "JPEG (8-bit)"
   mime (string) : "image/jpeg"
   write_image (function)
   extension (string) : "jpg"
   plugin_name (string) : "jpeg"
   max_height (number) : 0
   max_width (number) : 0
   quality (number) : 85
   toplevel.metatable :
         __luaA_TypeName (string) : "dt_imageio_module_format_data_jpeg"
         __name (string) : "dt_imageio_module_format_data_jpeg"
         __luaA_Type (number) : 99
         __index (function)
         __associated_object (userdata) :
            (no metatable)
            (no uservalue)
         __next (function)
         __pairs (function)
         __luaA_ParentMetatable (table) :
            __luaA_TypeName (string) : "dt_imageio_module_format_t"
            __name (string) : "dt_imageio_module_format_t"
            __luaA_Type (number) : 66
            __index (function)
            __next (function)
            __pairs (function)
            __tostring (function)
            __set (table) :
               max_width (function)
               max_height (function)
               (no metatable)
               (no uservalue)
            __newindex (function)
            __get (table) :
               extension (function)
               mime (function)
               write_image (function)
               name (function)
               max_height (function): toplevel.metatable.__luaA_ParentMetatable.__set.max_height
               max_width (function): toplevel.metatable.__luaA_ParentMetatable.__set.max_width
               plugin_name (function)
               (no metatable)
               (no uservalue)
            (no metatable)
            (no uservalue)
         __tostring (function)
         __set (table) :
            max_height (function): toplevel.metatable.__luaA_ParentMetatable.__set.max_height
            max_width (function): toplevel.metatable.__luaA_ParentMetatable.__set.max_width
            quality (function)
            (no metatable)
            (no uservalue)
         __newindex (function)
         __get (table) :
            name (function): toplevel.metatable.__luaA_ParentMetatable.__get.name
            mime (function): toplevel.metatable.__luaA_ParentMetatable.__get.mime
            write_image (function): toplevel.metatable.__luaA_ParentMetatable.__get.write_image
            extension (function): toplevel.metatable.__luaA_ParentMetatable.__get.extension
            plugin_name (function): toplevel.metatable.__luaA_ParentMetatable.__get.plugin_name
            max_height (function): toplevel.metatable.__luaA_ParentMetatable.__set.max_height
            max_width (function): toplevel.metatable.__luaA_ParentMetatable.__set.max_width
            quality (function): toplevel.metatable.__set.quality
            (no metatable)
            (no uservalue)
         (no metatable)
         (no uservalue)
   toplevel.uservalue : empty

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