diff --git a/rpcs3/Emu/RSX/Common/FragmentProgramDecompiler.cpp b/rpcs3/Emu/RSX/Common/FragmentProgramDecompiler.cpp
index 819d040eb1..b1e2a44739 100644
--- a/rpcs3/Emu/RSX/Common/FragmentProgramDecompiler.cpp
+++ b/rpcs3/Emu/RSX/Common/FragmentProgramDecompiler.cpp
@@ -542,11 +542,13 @@ bool FragmentProgramDecompiler::handle_scb(u32 opcode)
 	case RSX_FP_OPCODE_MIN: SetDst("min($0, $1)"); return true;
 	case RSX_FP_OPCODE_MOV: SetDst("$0"); return true;
 	case RSX_FP_OPCODE_MUL: SetDst("($0 * $1)"); return true;
-	case RSX_FP_OPCODE_PK2: SetDst(getFloatTypeName(4) + "(uintBitsToFloat(packSnorm2x16($0.xy)))"); return true;
+	//Pack operations. See https://www.khronos.org/registry/OpenGL/extensions/NV/NV_fragment_program.txt
+	case RSX_FP_OPCODE_PK2: SetDst(getFloatTypeName(4) + "(uintBitsToFloat(packHalf2x16($0.xy)))"); return true;
 	case RSX_FP_OPCODE_PK4: SetDst(getFloatTypeName(4) + "(uintBitsToFloat(packSnorm4x8($0)))"); return true;
-	case RSX_FP_OPCODE_PK16: SetDst(getFloatTypeName(4) + "(uintBitsToFloat(packHalf2x16($0.xy)))"); return true;
+	case RSX_FP_OPCODE_PK16: SetDst(getFloatTypeName(4) + "(uintBitsToFloat(packSnorm2x16($0.xy)))"); return true;
+	case RSX_FP_OPCODE_PKG:
+	//Should be similar to PKB but with gamma correction, see description of PK4UBG in khronos page
 	case RSX_FP_OPCODE_PKB: SetDst(getFloatTypeName(4) + "(uintBitsToFloat(packUnorm4x8($0)))"); return true;
-	case RSX_FP_OPCODE_PKG: LOG_ERROR(RSX, "Unimplemented SCB instruction: PKG"); return true;
 	case RSX_FP_OPCODE_SEQ: SetDst(getFloatTypeName(4) + "(" + compareFunction(COMPARE::FUNCTION_SEQ, "$0", "$1") + ")"); return true;
 	case RSX_FP_OPCODE_SFL: SetDst(getFunction(FUNCTION::FUNCTION_SFL)); return true;
 	case RSX_FP_OPCODE_SGE: SetDst(getFloatTypeName(4) + "(" + compareFunction(COMPARE::FUNCTION_SGE, "$0", "$1") + ")"); return true;
@@ -662,11 +664,13 @@ bool FragmentProgramDecompiler::handle_tex_srb(u32 opcode)
 			return true;
 		}
 		return false;
-	case RSX_FP_OPCODE_UP2: SetDst("unpackSnorm2x16(floatBitsToUint($0.x)).xyxy"); return true; // TODO: More testing (Sonic The Hedgehog (NPUB-30442/NPEB-00478))
-	case RSX_FP_OPCODE_UP4: SetDst("unpackSnorm4x8(floatBitsToUint($0.x))"); return true; // TODO: More testing (Sonic The Hedgehog (NPUB-30442/NPEB-00478))
-	case RSX_FP_OPCODE_UP16: SetDst("unpackHalf2x16(floatBitsToUint($0.x)).xyxy"); return true;
+	//Unpack operations. See https://www.khronos.org/registry/OpenGL/extensions/NV/NV_fragment_program.txt
+	case RSX_FP_OPCODE_UP2: SetDst("unpackHalf2x16(floatBitsToUint($0.x)).xyxy"); return true;
+	case RSX_FP_OPCODE_UP4: SetDst("unpackSnorm4x8(floatBitsToUint($0.x))"); return true;
+	case RSX_FP_OPCODE_UP16: SetDst("unpackSnormx16(floatBitsToUint($0.x)).xyxy"); return true;
+	case RSX_FP_OPCODE_UPG:
+	//Same as UPB with gamma correction
 	case RSX_FP_OPCODE_UPB: SetDst("(unpackUnorm4x8(floatBitsToUint($0.x)))"); return true;
-	case RSX_FP_OPCODE_UPG: LOG_ERROR(RSX, "Unimplemented TEX_SRB instruction: UPG"); return true;
 	}
 	return false;
 };