* If {{Parameter|imageHandle&}} is omitted, it is assumed to be the current write page. Invalid handles will create [[ERROR Codes|Illegal function call]] errors.
* [[_NEWIMAGE]] 32 bit [[SCREEN]] modes will always use an [[_UNSIGNED]] [[LONG]] ''colour'' value.
** Color values that are set as a [[_CLEARCOLOR]] always have an alpha level of 0 (transparent).
** [[_SETALPHA]] can set any alpha level from 0 or fully transparent to 255 or opaque.
** Normal color values that are set by [[_RGB]] or [[_RGB32]] always have an alpha level of 255(opaque).
* In 4 (16 color) or 8 (256 color) bit palette screens the function will always return 255.
*[[_RED32]], [[_GREEN32]], [[_BLUE32]] and [[_ALPHA32]] are all equivalent to [[_RED]], [[_GREEN]], [[_BLUE]] and [[_ALPHA]] but they are highly optimized and only accept a 32-bit color (B8:G8:R8:A8). Using them (opposed to dividing then ANDing 32-bit color values manually) makes code easy to read.
* '''NOTE: 32 bit [[_NEWIMAGE]] screen page backgrounds are transparent black or [[_ALPHA]] 0. Use [[_DONTBLEND]] or [[CLS]] for opaque!'''
''Example 1:'' Alpha transparency levels are always 255 in 4 or 8 bit screen modes.