Best Free and Open Source Alternatives to Adobe Photoshop

Adobe Photoshop is a raster graphics editor. Photoshop can edit and compose raster images in multiple layers and support masks, alpha compositing, and several color models including RGB, CMYK, CIELAB, spot color, and duotone. What are the best free and open source alternatives to Photoshop? Learn more about open-source graphics editors here.

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