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It's tricky with colors.
Originally the PSX games can't do much better as 16bit. The games look better with 32bit textures due the increased range for each of the colorspace component (RGB and alpha). 32bit rendering mode also shows significant better quality when texture filtering is turned on. But, if you choose to ignore filtering, you look at pretty much same colors that the original PSX would send to the TV screen.
Further the image quality that the 8 and 16 bit sprites produce can be improoved. We mentioned filtering. Textures can be improoved (like with the popular method of mr. Rice). Fullscreen filters applied. With smart algorithms a good "like 32bit originating look" can be achieved. But details can't be added. Only emulated, like with the toon shader.
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