Using the Luminosity Blend Mode allows you to adjust only the gray values in your image

First create an adjustment layer using the color adjustment of your choice. In the example above, I’ve chosen Color Balance. Next use the Blending Mode drop down menu at the top of the Layers panel to set the layer blending mode to Luminosity.

Now when you tweak the settings in your Adjustments panel, Photoshop will limit the changes to only the gray values in your image. As you can see in the image above, leaving the Blending Mode of the Adjustment Layer set to Normal introduces a lot of color shifting in the image. By changing it to Luminosity, Photoshop prevents it from taking place.

Unbalanced columns of InDesign text

Take the image above for example. Rather than inserting hard returns, using the Enter key to force text to the next column, or adjusting the size of the text container itself, you can simply use the Balance Columns feature. To do so, select the text container to make it active, then go to Object>Text Frame Options… (or hit Command + B). In the dialog box that appears, tick the Balance Columns checkbox. The results are a balanced columns of text, regardless of the text container size as seen in the image below.

The same text with InDesign's Balance Columns feature applied

The beauty of this feature is that you can add more text later and the text columns will always adjust to stay balanced, as opposed to having to go back manually and remove hard returns or re-adjust the size of the text container.