If you want to set a specific image format to open by default with Picview, meaning double-clicking on this format will open it with Picview, follow these steps:

  1. Locate an image of this format, such as jpg, in Finder.
  2. Select the image, right-click, and choose Get Info from the menu.
  3. In the info window, find the Open with section.
  4. Click the dropdown menu under Open with, and select Picview.app from the options.
  5. After selecting Picview, click the Change All button.
  6. In the confirmation dialog, click Continue.
  7. The setup is complete.

Setup Process

By following these 7 steps, all jpg files on the system will open with Picview by default. To set other formats, such as png or bmp, refer to the same steps.

Further Reading

  1. Set Multiple Formats to Open with Picview via Command Line
  2. Frequently Asked Questions
  3. Media Coverage
  4. Set Default File Open Applications on Mac — Detailed Guide for duti
  5. In 2024, I Developed a Mac Image Viewer App Picview. Compact, Fast, and Efficient for Viewing Images with a Windows-like Experience, Perfect for Photographers and Designers