[blaesus]

Preview can modify images. There's a button with a pencil icon that toggles a toolbar for simple image editing, such as adding lines, shapes, or texts.

[mistersquid]

I've been using the Markup in Preview since they went system-wide in macOS Mojave. (Today I learned that Markup debuted as an extension in Mac OS X 10.10 Yosemite. [0])

This comment and its children sent me on a spelunking mission and the treasures I found. Markup has a Loupe tool and Speech Bubbles.!

Such features are many, various, and somewhat obscure, akin to Easter Eggs. (Both undiscoverable and handy to know.)

[0] https://tidbits.com/2018/11/19/macos-hidden-treasures-the-ma...

[snowwrestler]

There’s a little prism icon too which opens a panel for Lightroom-type modifications like exposure, shadows, highlights, levels, sharpness, etc.

[crazygringo]

I mean I thought I was a Preview power user, but had never clicked that little toolbar button.

Blows me away I can do that stuff in Preview. Wow.

[jjoonathan]

It's got a good solid-color-to-alpha tool too!

[moralestapia]

Cmd + Shift + A : To show the bar.