Adds a new command for Modo, clip.newWithSize, which lets you specify explicit width/height of newly created images, rather than the usual square power-of-two.

newClipCustomSize.py

#!/usr/bin/env python

import os

import lx
import modo
import lxifc
import lxu.select
import lxu.command

def get_ColorSpaces():
	savers_name = ['(none)', '(default)']
	savers_uname = ['(none)', 'Default']

	scn_svc = lx.service.Scene()
	itype_scene = scn_svc.ItemTypeLookup (lx.symbol.sITYPE_SCENE)

	scene = lx.object.Scene(lxu.select.SceneSelection().current())
	scene_item = scene.AnyItemOfType(itype_scene)

	sel_svc = lx.service.Selection()
	chan_read = lx.object.ChannelRead(scene.Channels(None, sel_svc.GetTime()))
	scene_colorspace = chan_read.String(scene_item, scene_item.ChannelLookup(lx.symbol.sICHAN_SCENE_OCIOCONFIG))

	if not scene_colorspace or scene_colorspace == '(none)':
		return (savers_name, savers_uname)

	scene_colorspace_colon = scene_colorspace + ':'
	scene_colorspace_colon_len = len(scene_colorspace_colon)

	msg_svc = lx.service.Message()

	host_svc = lx.service.Host()
	for s in xrange(host_svc.NumServers(lx.symbol.a_COLORMAPPING)):
		server = host_svc.ServerByIndex(lx.symbol.a_COLORMAPPING, s)
		name = server.Name()
		if name.startswith(scene_colorspace_colon):
			uname = server.UserName()[scene_colorspace_colon_len:]

			savers_name.append(name)
			savers_uname.append(uname)

	for x in xrange(len(savers_uname)):
		niceUName = msg_svc.RawText('colorspace', savers_uname[x])
		if not (niceUName.startswith('!') and niceUName.endswith('=BUG!')):
			savers_uname[x] = niceUName

	return (savers_name, savers_uname)

def get_DefaultFormat():
	try:
		return lx.eval1 ('pref.value application.imageFormatName ?')
	except:
		return 'PNG16'

def get_ImageSavers():
	savers_name = []
	savers_uname = []
	savers_dostype = []
	savers_dostype_lower = []

	host_svc = lx.service.Host()
	for s in xrange(host_svc.NumServers(lx.symbol.a_SAVER)):
		factory = host_svc.ServerByIndex(lx.symbol.a_SAVER, s)
		if lx.symbol.a_IMAGE in factory.InfoTag(lx.symbol.sSAV_OUTCLASS):
			name = factory.Name()
			uname = factory.UserName()

			try:
				dostype = factory.InfoTag(lx.symbol.sSAV_DOSTYPE)
			except:
				continue
			else:
				savers_name.append(name)
				savers_uname.append(uname)
				savers_dostype.append(dostype)
				savers_dostype_lower.append(dostype.lower())

	return (savers_name, savers_uname, savers_dostype, savers_dostype_lower)

class OptionPopupFType(lxifc.UIValueHints):
	def __init__(self):
		self.names = ('Grey', 'RGBA', 'RGB')
		self.unames = ('Grey', 'RGBA', 'RGB')
		self.count = 3

	def uiv_Flags(self):
		return lx.symbol.fVALHINT_POPUPS

	def uiv_PopCount(self):
		return self.count

	def uiv_PopUserName(self,index):
		return self.unames[index]

	def uiv_PopInternalName(self,index):
		return self.names[index]

class OptionPopupColorspace(lxifc.UIValueHints):
	def __init__(self):
		self.names, self.unames = get_ColorSpaces()
		self.count = min (len (self.names), len (self.unames))

	def uiv_Flags(self):
		return lx.symbol.fVALHINT_POPUPS

	def uiv_PopCount(self):
		return self.count

	def uiv_PopUserName(self,index):
		return self.unames[index]

	def uiv_PopInternalName(self,index):
		return self.names[index]

class NewImageWithSize_Cmd(lxu.command.BasicCommand):
	def __init__(self):
		lxu.command.BasicCommand.__init__(self)
		self.dyna_Add('filename', lx.symbol.sTYPE_FILEPATH)
		self.basic_SetFlags(0, lx.symbol.fCMDARG_HIDDEN)

		self.dyna_Add('width', lx.symbol.sTYPE_INTEGER)

		self.dyna_Add('height', lx.symbol.sTYPE_INTEGER)

		self.dyna_Add('type', lx.symbol.sTYPE_STRING)
		self.basic_SetFlags(3, lx.symbol.fCMDARG_OPTIONAL)

		self.dyna_Add('fp', lx.symbol.sTYPE_BOOLEAN)
		self.basic_SetFlags(4, lx.symbol.fCMDARG_OPTIONAL)

		self.dyna_Add('setColor', lx.symbol.sTYPE_BOOLEAN)
		self.basic_SetFlags(5, lx.symbol.fCMDARG_OPTIONAL)

		self.dyna_Add('color', lx.symbol.sTYPE_COLOR)
		self.basic_SetFlags(6, lx.symbol.fCMDARG_OPTIONAL)

		self.dyna_Add('colorspace', lx.symbol.sTYPE_STRING)
		self.basic_SetFlags(7, lx.symbol.fCMDARG_OPTIONAL)

	def arg_UIHints(self, index, hints):
		if index == 1:
			hints.Label('Width')
			hints.MinInt(1)
		elif index == 2:
			hints.Label('Height')
			hints.MinInt(1)
		elif index == 3:
			hints.Label('Format')
		elif index == 4:
			hints.Label('Floating Point')
		elif index == 5:
			hints.Label('Set Color')
		elif index == 6:
			hints.Label('Color')
		elif index == 7:
			hints.Label('Colorspace')

	def cmd_ArgEnable (self, index):
		if index == 6:
			if not self.dyna_Bool (5, False):
				lx.throw(lx.symbol.e_CMD_DISABLED)
		return True

	def arg_UIValueHints(self, index):
		if index == 3:
			return OptionPopupFType()
		elif index == 7:
			return OptionPopupColorspace()

	def cmd_Interact(self):
		if not self.dyna_IsSet (0):
			filepath = modo.dialogs.fileSave('image@clip', get_DefaultFormat(), fspec='format', title='New Image...')
			if filepath:
				self.attr_SetString(0, filepath)

	def cmd_DialogInit(self):
		if not self.dyna_IsSet (1):
			self.attr_SetInt(1, 2048)
		
		if not self.dyna_IsSet (2):
			self.attr_SetInt(2, 2048)

		if not self.dyna_IsSet (3):
			self.attr_SetString(3, 'RGB')

		if not self.dyna_IsSet (4):
			self.attr_SetInt(4, 0)

		if not self.dyna_IsSet (5):
			self.attr_SetInt(5, 0)

		if not self.dyna_IsSet (6):
			self.attr_SetString(6, '0 0 0')

		if not self.dyna_IsSet (7):
			self.attr_SetString(7, '(default)')

	def cmd_Flags(self):
		return lx.symbol.fCMD_MODEL | lx.symbol.fCMD_UNDO | lx.symbol.fCMD_MUSTSETARG

	def basic_Enable(self, msg):
		return True

	def cmd_UserName(self):
 		return 'New Still with Size'

 	def cmd_Desc(self):
 		return 'Create a new image clip with specific width and height.'

 	def cmd_Tooltip(self):
 		return 'Create a new image clip with specific width and height.'

	def basic_ButtonName(self):
		return 'New Still with Size'

	def basic_Execute(self, msg, flags):
		filepath = self.dyna_String(0, None)
		if filepath is None:
			msg.SetCode(lx.result.CMD_MISSING_ARGS)
			return

		if not filepath:
			msg.SetCode(lx.result.e_FAILED)
			msg.SetMessage("clip.new", None, 1)
			return

		width = max(1, self.dyna_Int(1, 2048))
		height = max(1, self.dyna_Int(2, 2048))

		ftype = self.dyna_String(3, 'RGB')
		fp = self.dyna_Bool(4, False)
		setColor = self.dyna_Bool(5, False)
		color = self.dyna_String(6, '0 0 0')
		colorspace = self.dyna_String(7, '(default)')

		savers = get_ImageSavers()
		formatDosType = os.path.splitext(filepath)[1].lstrip('.').lower()
		if formatDosType in savers[3]:
			fileFormat = savers[0][savers[3].index(formatDosType)]
		else:
			msg.SetCode(lx.result.e_FAILED)
			msg.SetMessage("clip.new", None, 1)
			return

		lx.eval('clip.newStill "%s" type:%s fp:%s setColor:%s color:{%s} format:%s colorspace:%s width:%s height:%s' % (filepath, ftype, fp, setColor, color, fileFormat, colorspace, width, height))

lx.bless(NewImageWithSize_Cmd, 'clip.newWithSize')