Article:		Bitmap Image Filters
Subject:		ah you had given me support by giving me a problem to solve
Date:		2002-08-10 10:16:59
From:		psheldon
Response to: handle alpha channel?
I do need some (easy) problems. I don't get the syntax on right hand side of : int ao = [srcImageRep hasAlpha] ? 1 : 0; supposedly setting a0 to 1. Are ? and : c operators and is this rhs c syntax? My c pdf file from an old codewarrior has awful hypertexting.

Showing messages 1 through 1 of 1.

• friend Dan Van Bose in Fort Worth explained syntax
  2002-08-11 14:40:41  psheldon [View]
  
  
  c = boolean ? a : b
  
  c evaluates to first symbol after ? if boolean true and second expression if false.
  
  So, this sentence commands skipping by an offset if Alpha is there and mixing 3 colors only.
  
  I understand now.