I need to make a poster that contains all my coworkers pictures on a grid

In Lightroom, your poster is really easy to make.

First choose the Print categorie on the top of the screen

and all images have to be in Lightroom

2) In Layout style: choose contact sheet

3) In the page setup you have to define the paper size before you go further

3) In Layout: choose how many images per column and rows and define your margins

4) et voila: that easy!

Optional you can add a black frame around the images with Image settings

If you want to some text you can do that as a comment in Acrobat Reader or in Word/PowerPoint or something like that.

I hope it's Helpful.

Good luck

Patrick

Chances are, if you are preparing a poster of the faces of coworkers, you have been supplied with images that vary in size, resolution and appropriate cropping.  If that is the case, the following Photoshop technique will allow you to prepare the images for placement in the grid.

In the sample below, images that varied in size, res and required crop were changed to provide the required uniformity. I hope this helps.

1. Open two or more images. Pick one.

   a. Choose the Crop tool. Checkmark the “Delete Cropped Pixels” box in the Options bar and crop the image to the desired shape.

   b.  Choose Image > Image Size and enter the desired dimensions, and resolution. Confirm that the Resample Image box is checked and that  “Bicubic Automatic” appears in the field at the bottom of the menu.

Once OK’d, we will refer to this master as the Front Image.  

2. With the Front Image still chosen, switch to the Crop tool. In the Options Bar’s first field use the double arrows to change the field designation from Unconstrained to Size & Resolution.

3. In the drop-down Menu that appears, change the Source field from Custom to Front Image. The size and resolution of that file will be automatically entered in the appropriate fields.

4. Click OK and then click the Esc key.

5. With the Crop tool still chosen, click a file to be changed. The cropped version of it will appear immediately. At this time, if desired, you may move, rotate and/or alter the crop area. (If you want to shift area chosen, click on a crop handle, then reposition to the desired area.) The image proportion will not change.

6. Click the Return key. The size and resolution of this cropped image will match the file you designated Front Image.

7. Save and close the file if desired.

8. Repeat Steps 5 through 7 for each the other files that require adjustment.

9. Finally, in the Crop tool’s Options Bar, use the double arrows to return the field designation to Unconstrained.

There are several ways to do it.

If these solutions do not work for you let us know!

Good luck!

How do you plan to use this image?  Will this be used for a printed poster and if so, what size poster do you need?