Green offset (in bytes) for a given pixel format. This specifies the number
of bytes that the green 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 green component will be
<tt>pixel[tjGreenOffsetTJ_BGRX]</tt>.
Green offset (in bytes) for a given pixel format. This specifies the number of bytes that the green 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 green component will be <tt>pixel[tjGreenOffsetTJ_BGRX]</tt>.