Blue offset (in bytes) for a given pixel format. This specifies the number
of bytes that the Blue component is offset from the start of the pixel. For
instance, if a pixel of format TJ_BGRX is stored in <tt>char pixel[]</tt>,
then the blue component will be <tt>pixel[tjBlueOffsetTJ_BGRX]</tt>.
Blue offset (in bytes) for a given pixel format. This specifies the number of bytes that the Blue component is offset from the start of the pixel. For instance, if a pixel of format TJ_BGRX is stored in <tt>char pixel[]</tt>, then the blue component will be <tt>pixel[tjBlueOffsetTJ_BGRX]</tt>.