Flags for AT_PDE_IMAGEATTRS. See Section 4.8.4 in the PDF Reference for more information on image attributes.

Values:

IG_PDE_IMAGE_EXTERNAL	0x0001	Image is an XObject.
IG_PDE_IMAGE_MASK	0x0002	Image is an imagemask.
IG_PDE_IMAGE_INTERPOLATE	0x0004	Interpolate is true.
IG_PDE_IMAGE_HAVE_DECODE	0x0008	We have a decode array.
IG_PDE_IMAGE_INDEXED	0x0010	Uses an indexed color space.
IG_PDE_IMAGE_MASKED_BY_POSITION	0x0020	Image has a Mask key containing an ImageMask stream.
IG_PDE_IMAGE_MASKED_BY_COLOR	0x0040	Image has a Mask key containing an array of color values.