try this--don't use opacity---
make PSD a tiff (save with layers to preserve transparency) then apply tinted value to grayscale with color slider in Indesign.
I tried your suggestion, but I can't get it to work. Perhaps I misunderstood your instructions. Seems you need a solid background to tint the image when placed into ID. If I have a transparent background, it doesn't work. I even tried creating an alpha channel in PS so I could strip the background where I want it transparent, but that also seems to disable the ability to tint. Tried PSD and TIFF, both CMYK and grayscale. The only thing that works for me is a grayscale with a solid background. Unfortunately, that tints the entire rectangle, which is not what I need. I need to leave parts of the rectangular PS image transparent.
I appreciate the suggestion. Let me know if I am missing something.
you should be able so save your original PSD file as a tiff and still have the background be transparent.(can you post a screenshot of the PSD file?).
after placing in Indesign--select grayscale tiff with hollow arrow tool
fyi--alpha channel, PSD and CMYK--connot be colorized--only graysacle or bitmap
When placing a grayscale TIF, I can lower the tint after selecting the image with the Direct Selection Tool. It does fade, as you say. If I lower the Tint to zero, the image fades to pure white and I end up with a solid white rectangle. Much of this rectangle in my original is transparent. I tried saving the TIF as a single layer (not a background) with transparency, as two layers (bottom layer with a white background, turned off), as a transparent layer on top of a white "background" (also turned off), with and without alpha channels, etc. As you said, if I use an alpha channel or CMYK when placing the image into ID, the tint feature does not work at all.
Interestingly, if I place the TIF first, and THEN selecting Object > Clipping Path > Options, I can then select an alpha channel, it hides the transparent rectangle, but the slider works fine on the remaining image. If I invoke the alpha channel option when placing the image into ID, it doesn't work. So, that seems to be the key.
I appreciate the help. I learned something.