There are several open-source alternatives to Adobe Photoshop that you can use for image editing and graphic design on Linux and other operating systems. Some of the most popular options include:
GIMP (GNU Image Manipulation Program): This is a powerful and feature-rich image editing and graphic design software that is available for a wide range of platforms, including Linux, MacOS, and Windows. It offers many of the same tools and features as Photoshop, including support for layers, masks, filters, and plugins.
Krita: This is a free and open-source digital painting and illustration software that is popular among artists and designers. It is available for Linux, MacOS, and Windows, and includes a wide range of features such as brush and canvas customization, support for multiple layers and channels, and support for a variety of file formats.
Inkscape: This is a free and open-source vector graphics editor that is available for Linux, MacOS, and Windows. It is similar to Adobe Illustrator, and includes features such as support for layers, paths, text, and shapes, as well as support for a wide range of file formats.
Photopea: This is a web-based image editor that is similar to Photoshop, and offers many of the same tools and features. It is available for free, and does not require any installation or setup.
These are just a few examples of the many open-source alternatives to Photoshop that are available. You can find more options by searching online or by consulting the software repositories of your operating system.