Does each colorprofile use a different gamma curve?

[gamerwithalife11-cmyk]

Or is it all the same gamma curve with different color corrections

[profi200]

It varies per profile. See here. First and last of each entry are the gamma settings.

open_agb_firm/source/arm11/oaf_video.c

Lines 119 to 197 in bd4f29b

	typedef struct
	{
	float targetGamma;
	float lum;
	float r, gr, br;
	float rg, g, bg;
	float rb, gb, b;
	float displayGamma;
	} ColorProfile;
	// libretro shader values. Credits: hunterk and Pokefan531.
	// Last updated 2024-12-03.
	static const ColorProfile g_colorProfiles[8] =
	{
	{ // libretro GBA color (sRGB).
	2.2f + (0.3f * 1.6f), // Darken screen. Default 0. Modified to 0.3.
	0.91f,
	0.905f, 0.195f, -0.1f,
	0.1f, 0.65f, 0.25f,
	0.1575f, 0.1425f, 0.7f,
	1.f / 2.2f
	},
	{ // libretro GB micro color (sRGB).
	2.2f,
	0.9f,
	0.8025f, 0.31f, -0.1125f,
	0.1f, 0.6875f, 0.2125f,
	0.1225f, 0.1125f, 0.765f,
	1.f / 2.2f
	},
	{ // libretro GBA SP (AGS-101) color (sRGB).
	2.2f,
	0.935f,
	0.96f, 0.11f, -0.07f,
	0.0325f, 0.89f, 0.0775f,
	0.001f, -0.03f, 1.029f,
	1.f / 2.2f
	},
	{ // libretro NDS color (sRGB).
	2.2f,
	0.905f,
	0.835f, 0.27f, -0.105f,
	0.1f, 0.6375f, 0.2625f,
	0.105f, 0.175f, 0.72f,
	1.f / 2.2f
	},
	{ // libretro NDS lite color (sRGB).
	2.2f,
	0.935f,
	0.93f, 0.14f, -0.07f,
	0.025f, 0.9f, 0.075f,
	0.008f, -0.03f, 1.022f,
	1.f / 2.2f
	},
	{ // libretro Nintendo Switch Online color (sRGB).
	2.2f + 0.8f, // Darken screen. Default 0.8.
	1.f,
	0.865f, 0.1225f, 0.0125f,
	0.0575f, 0.925f, 0.0125f,
	0.0575f, 0.1225f, 0.82f,
	1.f / 2.2f
	},
	{ // libretro Visual Boy Advance/No$GBA full color.
	1.45f + 1.f, // Darken screen. Default 1.
	1.f,
	0.73f, 0.27f, 0.f,
	0.0825f, 0.6775f, 0.24f,
	0.0825f, 0.24f, 0.6775f,
	1.f / 1.45f
	},
	{ // Identity.
	2.2f,
	1.f,
	1.f, 0.f, 0.f,
	0.f, 1.f, 0.f,
	0.f, 0.f, 1.f,
	1.f / 2.2f
	}
	};