If you have a fast internet and you don't often have to deal with photo processing, use an online image editor to correct the picture, change its size, color gamut and perform other simple operations.
You can use one of the many image correction services available on the Internet: www.fanstudio.ru, www.mypictureresize.com, www.editor.pho.to etc. All services are free and you will not be asked for money to download or print the result. As an example, consider the procedure for working with a photo on the site. www.mypictureresize.com. Working with an image on other resources will not have fundamental differences, but someone will find this or that editor more convenient
Going to the site, you will see a fairy-tale hero familiar to everyone. Do not think about how Winnie the Pooh has to do with editing pictures, but just click the "Select File" button, upload your photo and click "Get Started".
An editor window will open, somewhat reminiscent of the interface of the popular Photoshop program. In the menu on the left, you can take the simplest tools, by clicking the buttons at the top, you will get access to various commands and effects, and when finished working with the picture, click the "Save Photo" button in the lower right corner.