These functions generate various images. You can combine them withthe arithmetic and rotate functions to build more complicated images.
vips_black()vips_xyz()vips_grey()vips_gaussmat()vips_logmat()vips_text()vips_gaussnoise()vips_eye()vips_sines()vips_zone()vips_sdf()vips_identity()vips_buildlut()vips_invertlut()vips_tonelut()vips_mask_ideal()vips_mask_ideal_ring()vips_mask_ideal_band()vips_mask_butterworth()vips_mask_butterworth_ring()vips_mask_butterworth_band()vips_mask_gaussian()vips_mask_gaussian_ring()vips_mask_gaussian_band()vips_mask_fractal()vips_fractsurf()vips_worley()vips_perlin()