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Blur, diffusion, glow, lift/gamma/gain (color correction), mirror,
-mix (add two inputs), scale (bilinear and Lanczos), sharpen
-(both by unsharp mask and by Wiener filters), saturation (or desaturation),
-vignette, and white balance.
+mix (add two inputs), overlay (the Porter-Duff “atop” operation),
+scale (bilinear and Lanczos), sharpen (both by unsharp mask and by
+Wiener filters), saturation (or desaturation), vignette, and white balance.
Yes, that's a short list. But they all look great, are fast and don't give
you any nasty surprises. (I'd love to include denoise, deinterlace and