2 In GIMP. I used two layers, the original without blur, beneath a duplicate layer with full blur. Then I applied a black to white gradient […] Manual tilt shift lens effect in the GIMP by John ...2011-07-28 in portfolio tagged Adobe Photoshop / Creative Commons / GIMP / Graphics / Inkscape / John LeMasney / Linux / MorgueFile / postaday2011 by lemsy (updated 1628 days ago)