Use the Adjust room then set the Saturation tool to -100 (slider all the way to the left). You may also need to tweak the Contast and/or Exposure to bring out the best details once you've got a monochrome image.

Hello Ali2017,

The easiest way to do that is to reduce the saturation under Adjustments.



You may find you need to then adjust contrast, highlight & shadow, depending on the clarity of the original photo.

PIX

Edit: What optodata said! PIX YouTube channel

Thank you guys. I did it.

A last question, can we edit a part of a photo? Example, I have an area on the pic which I need to edit only by sharpening, increase saturation and exposure while the rest of the area on the image stays the same.

Seems like you could do that by making a copy of the original image then making the changes to it (even though it will negatively impact the sections you want to keep as is), then go back to the original pic and add the new copy directly on top.

Once that's aligned, select the Cutout tool and use your finger to erase/keep the appropriate section so the net effect will be your original image in the background with the enhanced section overlaid on top.

Here's what I came up with just quickly trying this out. Instead of adjusting contrast, etc., I used the original color pic and overtlaid it with the B&W version then blended in just the color telescope:



I used the opacity control to verify I had the 2 main pics aligned, then used the eraser brush from the Add Image screen to "paint away" the B&W sections of the telescope to let the color version show through

My goodness! Very inventive optodata! I have no idea what that yellow "thing" is, but you've done a good job of editing & overlaying.

Ali2017, unlike the desktop version of PhotoDirector PhD Mobile has no facility to create masks, which would be the standard approach to modifying only part of an image.

PIX PIX YouTube channel