Left edge profile at y=500:
x=190: R=0, G=0, B=0
x=191: R=0, G=0, B=0
x=192: R=0, G=1, B=0
x=193: R=0, G=1, B=0
x=194: R=2, G=1, B=0
x=195: R=2, G=1, B=0
x=196: R=2, G=0, B=3
x=197: R=2, G=0, B=3
x=198: R=2, G=2, B=2
x=199: R=2, G=2, B=2
x=200: R=1, G=1, B=0
x=201: R=2, G=2, B=0
x=202: R=3, G=3, B=3
x=203: R=45, G=41, B=29
x=204: R=201, G=185, B=152
x=205: R=184, G=168, B=134
x=206: R=242, G=234, B=223
x=207: R=253, G=249, B=248
x=208: R=251, G=250, B=248
x=209: R=251, G=250, B=248
x=210: R=250, G=249, B=247
x=211: R=249, G=248, B=246
x=212: R=247, G=246, B=242
x=213: R=246, G=245, B=241
x=214: R=245, G=244, B=240
x=215: R=244, G=243, B=239