By default, and like it or hate it, the macOS keystrokes to capture full app screen (⇧- ⌘- 5) will add a subtle drop shadow around your saved image.  This can make it more visually appealing when adding a screen shot or image to a document.  The convert app, part of the ImageMagick distribution, has a nice command line function to add this same drop shadow effect to any of your images (e.g., a partial screen capture using .⇧- ⌘- 4)

Once installed, you can use the following command line to update your image with a drop-shadow:

convert "Screen Shot 2021-07-07 at 09.47.13.png" \( +clone -background black -shadow 80x20+0+15 \) +swap -background transparent -layers merge +repage "Screen Shot 2021-07-07 at 09.47.13.png"

which will turn this:

into this:

Pro-tip: You can create a pseudo-function in your BASH or ZSH environment - e.g., in your ~/.bashrc file, add this line:

shadow () { convert "$@" \( +clone -background black -shadow 80x20+0+15 \) +swap -background transparent -layers merge +repage "$@"; }

and then source your ~/.bashrc file (first time) to activate it:

source ~/.bashrc

Now, from your command line, you can add a drop shadow to any image file by simply typing:

shadow "Screen Shot 2021-07-07 at 09.47.13.png"

(remember to add double-quotes around your file if it contains spaces)

Adding a drop shadow to a PNG image can significantly enhance its visual appeal, making it stand out against any background. This shadow effect creates a sense of depth, giving the image a more three-dimensional look. For designers and content creators, incorporating shadow png images into their projects can elevate the overall aesthetic, making designs more engaging and professional.

For web developers looking to add a drop shadow to PNG images via CSS, the box-shadow property is a versatile tool. Here's a quick example:

css img { box-shadow: 10px 10px 20px rgba(0, 0, 0, 0.5); }

This code snippet adds a subtle shadow effect to images, using a black shadow with 50% opacity. Adjust the values to achieve the desired shadow projection and intensity.

Shadow png images are not just for aesthetic purposes; they can also serve functional roles in design. For instance, using shadows can help guide the viewer's attention to specific elements, create a sense of hierarchy, or add texture to flat designs. Whether you're designing a website, creating digital art, or preparing a presentation, shadows can be a powerful tool in your creative arsenal.

By leveraging tools like ImageMagick or CSS, you can easily apply a drop shadow effect to your PNG images, enhancing their impact and ensuring they capture the viewer's attention.

Done.