Apple released an update for Yosemite earlier this month, and this new OS X 10.10.3 boots the crusty, trusty old iPhoto program out of the Dock to make room for a new app simply called Photos for OS X. (The new software is also intended to replace Aperture, Apple’s higher-end management tool for professional photographers.) To start using it, just click the new rainbow Photos icon in the Dock and walk through the Welcome and Setup screens Apple has provided to get your Mac’s existing pictures introduced to Photos for OS X.

So how is Photos for OS X the same — or different — from iPhoto?

If you use iOS 8, the new Photos for OS X visually looks quite similar. Same white background and borderless thumbnail images. Same browsing by groupings known as Moments, Collections and Years. Same importing powers to pull all the images off your camera card, phone or tablet into the computer’s picture library.

If you turn it on, though, there’s now online syncing and storage between your computer and iOS devices with the iCloud Photo Library in the sky. These photos are stored in your iCloud account at their original size and resolution too, so there’s so inferior quality for the uploaded versions. But remember, big photos mean big file sizes and that free 5 gigabytes of space you get with an iCloud account will get eaten up a lot faster. So you may want to acquaint yourself with Apple’s price list for additional iCloud storage.

iPhoto devotees who need to supply steady pictures of grandchildren to eager grandparents may be relieved to know you can still create photo books and other picture gifts through the new Photos program. You also have new printing options for square and panoramic shapes.

You can move around your library and navigate using the Photos, Shared, Albums, and Projects tabs at the top of the screen, And yes, you still have the cropping, color-adjustment tools, filters and other photo-editing sliders to make your pictures look better. Finding and using the tools just may take a little extra effort at first.

Apple did throw a few features overboard to make way for the new stuff. For example, although your ratings are preserved for older photos, you can’t apply star ratings to pictures anymore and have to make do with the Favorites heart.

But what about the people who hate change, forced upgrades or having to hang ten on the learning curve? Even though the update sticks a Photos icon in your dock  — and removes iPhoto or Aperture from view — the actual programs are still in your Mac’s Applications folder. If you choose to go back and dig up your old editor, the Mac asks if you want to open your library there or in the Photos app. Keep in mind that any changes or edits you make in iPhoto or Aperture do not appear in Photos, and vice versa.

iPhoto was getting a little long in the tooth, and those of you with large picture libraries probably had some issues with sluggishness. So even though the user interface is pretty different, give it a try first. Apple even has a quick-start guide on its site to help you through the transition.

And if you hate it? Off to the Applications folder to dig out your old mothballed program of choice.