notes for Colorize images in indesign:
colorize in indesign images must be gray scale, flattened no transparency, no pdf click on content grabber (runder kreis in der mitte vom bild) to select image then click on color in the swatches panel (and a tint)
create gray scale images in Photoshop
don't use gray convert in Photoshop (images will be inverted in indesign) use normal desaturate instead, crtl + u
see photoshop layers
object -> object layer options