moments after i posted this question, i realized that the image in Photoshop (in which i transferred one other image from InDesign)even though it was downloaded, it was in greyscale mode. i thought that this was not possible, if i haven't changed it myself. anyway, thank you very much.
p.s. actually i don't know other way of transferring colors. i drop the images from one program to the other. if there is any other easier way (which i'm sure that exists) let me know!
thanx!