How to change/correct tilt in a photo?

There used to be a edit tool in iPhoto to do this but I can not fine it anymore.

That has been a long time ago. The first versions of iPhoto had a "keystone" tool, but I have not seen something similar in iPhoto '09 or '11. In Photos I am using the third-party application DxO Perspective and call it via the External Editors extension. It is very intuitive to use. Or, if you have Luminar 2018, you can use the sliders for the horizontal or vertical tilt in Luminars "develope" tools. Luminar 2018 can also be called as a photo editing extensions from Photos's editing panel.

Since that feature, Perspective correction, has never been a part of Photos or other Apple photo editing apps, you'll need to use a 3rd party application (a technical solution) like Photoshop, Photoshop Elements, GraphicConverter or Polarr Photo Editor, among others.

And you respond to a three year old thread? Well given that you've addressed your half-witted comments to me, I'll respond and say all you need is an app that does lens correction. There are many. Perhaps your meds need adjusting.

You have to consider yourself as extremely lucky, if it takes only 3rd party to fix basic level casting error on Apple product.

It did took PC, two Software company, Phone and two ISP to be able to write this reply.

This absolutely 100% verified (on normal use) environment did ask my phone (company I for HW and company II as tele-operator).

I just cannot give my simply how-to-fix answerr any more. It just would be again every humanistic rules that I have on last square on my life.

Even the KGB would be envy for this process. So I need to shut myself out from this world vision.

Problem still exist, so there was not a single soul on this community to get _solid_ technical fix for this.

Honestly I know why. When they (customers) get age of twenty, they get interested another items.

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Thank you Old Toad...

Honestly this was something I was afraid. I have face this sama problem few years ago, so crappy that it still occur in it original forma.

Apropå.

Not sure is this techical anomality caused by *pple or *oogle.
For some reason, my PC, with *S OS, with *oogle browser, will always ask 3rd party HW authentication before I can post to this forum.

I'm "techinal view holder" on small cap company, and one item on my work list on next year, is to give opinion for "capex holder" about matter how should we equip our lads..

I have to be honest on mobility meeting. I just need to bring this as first item. Well, do not have anything behind it.

Last item is since, I have not face any of these challenges with lads from Koryoso....

Before I was able to post this, I did need to use another ½h our to unlock my ID. Then agains still to assure my own non-*apple PC to with 3rd party HW.

Small cap companies simply do not have money to pay this kind of lost of work time.

I'm so old, that I still remember this:

1984 Apple's Macintosh Commercial (HD) - YouTube

Dear Devlin, please give me a helping hand since you do have view from large cap (millions of users) company IT-leader.

I'm using *enovo, *10 and *hrome.

Also using three different ISP, since I have data gap on my mobiles.

How many from your millions, does have this same consept and does not have authentication challenge?

What's with the asterisks? You think people here are afraid of the words Lenovo and Chrome? Does *10 mean Windows 10? What - apart from your pathetic attempt to bully - does market cap have to do with the fact that you don't know how to use your computer?

Any time you want to make a lick of sense, post back.

Millions of people use this site and don't have your authentication issues. But you do. Wonder where the problem is?

IN Photos it's part of the crop tool. Note the arc at the side. In iPhoto it's where it always was. Edit Toolbar -> Straighten

That kind of lens correction is not available in Iphoto, Photos or even Aperture. You'll need a 3rd party app for that.