cccR: Color contrast calculator with R

.Random.seed <-
c(403L, 18L, 1207007933L, 1195955511L, 1404131806L, 1343897368L, 
-535030149L, 1588909081L, -531544920L, 1204207190L, -1401578799L, 
-1763534205L, -871960302L, 473969828L, -1754045337L, -1460408899L, 
569569076L, 1938705562L, 407237349L, 974441599L, 2010531334L, 
832082320L, -846132173L, -1312996399L, 1417447808L, 651486302L, 
-573885527L, -1111168421L, 446844522L, -1865649396L, -379906737L, 
-619639291L, 1712518332L, 1271080338L, 1375993485L, 86742215L, 
-1103744594L, 1498143752L, -261353461L, -1458117399L, 415220664L, 
-1464136602L, 1970941185L, 836758419L, -358912958L, 2139132916L, 
-1657954825L, -1424277011L, 215429764L, -831544150L, -619720171L, 
1295380143L, 1278626998L, -767821088L, 1777051171L, 1713023297L, 
1057207344L, 1336520270L, -331203911L, 1792433867L, -6600838L, 
-1445040516L, 994765503L, -738374763L, 837577644L, -1307049598L, 
235751261L, 681667159L, 647749950L, -385883784L, 398875227L, 
1310879161L, -46559224L, -502173002L, 981354993L, 1204650019L, 
-217202574L, -1325538620L, 1344607367L, 1270704221L, 1982131796L, 
112495738L, -1130407995L, 1739020575L, -198469466L, 1422129712L, 
-1103085357L, -138457359L, 499658272L, -876439362L, -1490813751L, 
-609749381L, -842107830L, 1722047660L, 1461390255L, -871338139L, 
139740444L, -1665708686L, 1385399789L, 1044449831L, -1859196338L, 
363835048L, -1145936725L, 1803437513L, -1356674600L, -1407147898L, 
2030447969L, -1679253261L, -2041032862L, -443307564L, -80093993L, 
372612813L, -2056202652L, 1826640970L, 844213L, -868815601L, 
299616790L, 1955677376L, 356123267L, -1387606367L, 1698152592L, 
969403246L, 1403745561L, -1040333397L, -1823325286L, -938026148L, 
-1929807265L, 973283893L, 1900390860L, -655318750L, 1345921917L, 
-1751089033L, 1730692510L, -1421411240L, 2084153787L, 1658089305L, 
2109459688L, -962259690L, -182286703L, 1982843715L, 555947602L, 
-2055210780L, -2029786329L, -1596645507L, -1253657996L, -788583334L, 
949204133L, 678121151L, 436516166L, -1098155056L, 581981683L, 
-1495277295L, 1526721856L, -1333252834L, 1353177577L, -890250469L, 
-136297174L, -743104948L, 918399503L, 1161424197L, 647655164L, 
-57113262L, -1717359923L, 1712505479L, 1998783854L, -705708216L, 
2120289099L, -19270999L, 504395768L, 364074790L, 1641580609L, 
-457365037L, 923648898L, -1941133388L, -1928708297L, -369945043L, 
1372530500L, 350295146L, 1687244501L, 1592068207L, 772950390L, 
840102560L, -1237950621L, -632998911L, -761151632L, -1468598514L, 
1681256825L, -437353205L, 1126080058L, 1094767932L, -145696129L, 
795001301L, 1661542380L, -1211367102L, -1610170723L, 636033815L, 
1030359678L, 920017464L, 1941478683L, 1857342073L, -332970296L, 
-841916682L, 835139377L, 2091069283L, -196590286L, 1674188420L, 
-1270218041L, -1888853603L, 1260659988L, -1139643462L, 1227873797L, 
99852255L, -878537114L, 2046902768L, -1623077101L, -1259384655L, 
-876154016L, 1146593534L, -1583443831L, 53395387L, 842189194L, 
-231147412L, -1135601169L, -1668656603L, -7665956L, -46326606L, 
-837193811L, -286461081L, 980127886L, -1015690156L, 1289808658L, 
-1782624864L, 55949260L, 1885598560L, 1729887426L, 107487784L, 
1055767980L, 266521404L, -414449806L, 1372233520L, 1941357604L, 
1829683768L, -2053380390L, -927595632L, 433953020L, -1172504172L, 
1819296578L, -136889856L, 679543868L, 794503760L, -1567914846L, 
-1090144440L, 300523020L, 1358995164L, -827457454L, -2027806592L, 
-1546364076L, 1022321640L, -727284998L, -902193328L, 818446380L, 
-1904799372L, 1371026066L, 1195180640L, 180520076L, 1603941728L, 
-465934110L, -630931288L, -1799157044L, -412129796L, 358883250L, 
429586416L, 1954104772L, 1493555544L, -551111302L, -1170209360L, 
-1963071044L, 1713420884L, 531819970L, -511067360L, -560485444L, 
-2019965872L, 446914530L, -1357331608L, 1110017868L, 1342012156L, 
667441906L, 1844097280L, -1232661388L, -1113359864L, -978744902L, 
-1727120944L, -81441812L, -1706047596L, 1884376274L, -279197600L, 
-787488436L, -1683478752L, 1732962946L, 1526491624L, -1572203540L, 
-317817284L, 2076121714L, 2045370224L, -643206876L, -1322160584L, 
1678253466L, -834849328L, 1316393404L, 422380180L, 591910530L, 
865718720L, 1088560956L, 463140496L, -761335006L, -189061624L, 
-1616005364L, 202143644L, -111362030L, 797975424L, 1942814484L, 
-1765750488L, -1670782918L, -39692336L, -2071917972L, -408269772L, 
1636349074L, 970440032L, 2059456844L, 1192307168L, 256991138L, 
240185256L, -425610100L, -1419439172L, -223217550L, 1641780208L, 
-203390908L, 1591080024L, 1630474298L, 335962224L, 1458508348L, 
-1841218796L, -78913854L, -161243424L, 1744245884L, -2013888304L, 
-1200565342L, -331738584L, 91317516L, -1150338116L, -915192526L, 
1567050944L, -1230537164L, 184448712L, 1383257786L, -915013488L, 
-288212244L, -27284908L, -1584599406L, -331637984L, -1179309108L, 
-2080686880L, 1536699074L, -1551572952L, -1339028564L, 177814204L, 
1473504754L, -1943353808L, -1833013340L, 805242296L, -412328102L, 
999250064L, -1587876996L, -711433452L, 302227778L, -1992752384L, 
-1695617092L, -638209200L, -1659833054L, -17064376L, -41261044L, 
-993374116L, -1651754542L, 513882624L, -1458216620L, -140188440L, 
732962042L, -923887920L, -1145647828L, 1654122740L, 1228338578L, 
-1547003552L, -326715380L, -220922144L, -1269433758L, -1871143256L, 
602986060L, -1680131204L, -967166670L, -1569718672L, -337151164L, 
264934360L, -1389453446L, -1502547408L, 1246792636L, -2069290412L, 
1028312130L, -201746272L, 622412476L, 1398250960L, -1209428126L, 
826594024L, -1987533620L, -879317508L, -1964385806L, -8309120L, 
534898164L, 1225675400L, 1987004218L, -1130389680L, -1303819156L, 
81145236L, 1179913298L, -339895840L, 460149964L, -953061216L, 
1896786306L, 914307304L, -588684564L, -1981745860L, 302320754L, 
1084359792L, 358083620L, 1369006136L, -122090726L, -1995391792L, 
-1169376452L, -349263980L, 179187586L, 1392367040L, 189129276L, 
1381890448L, -781084126L, 701164808L, 1778457228L, 97203996L, 
908742802L, -813964928L, -2077801964L, 184599336L, -1732057542L, 
1979677136L, -1133595284L, 1852609460L, -1645216750L, -204312096L, 
-1281350928L, -1292224871L, -1290003829L, -1992688772L, 1434238378L, 
-506522145L, 195912553L, -1419541634L, 1692482412L, 1810419645L, 
1579973767L, -208285584L, 785881870L, 1801025595L, -674711779L, 
-1661233718L, -723423512L, -1808637487L, -207178813L, -1390113596L, 
1441551218L, 884444743L, -336777711L, -276529258L, 327713524L, 
456270981L, -173712945L, 1781058760L, 472530278L, 1875500947L, 
-935624459L, -13399854L, -1210927328L, -1310918903L, 875552827L, 
-1372400244L, 2050919450L, 1191141519L, -726353959L, 666556526L, 
-2044273668L, -388003475L, 2079916823L, -1089461536L, 289988798L, 
226496139L, -2040605427L, 368482618L, 1681893752L, -591541471L, 
-243704877L, 719086324L, -497726590L, -196789737L, -282683167L, 
-482380250L, 1958424356L, -1589223467L, 570386303L, 812618264L, 
-1650126538L, 2138390467L, -490177019L, 1433382306L, -1353059952L, 
-1328379591L, -779170325L, 795815644L, -941860086L, -771893761L, 
1555016777L, 754830814L, -959111796L, -992384675L, 1400848743L, 
1578828432L, -338223954L, -839791269L, -579391171L, -1374889046L, 
1270189128L, -2012679055L, 74514915L, -1312170780L, 1071319058L, 
718351335L, -634842191L, 724397558L, 1103761428L, 1660862245L, 
816834607L, -438783512L, -2021521722L, 60606323L, -319168555L, 
162568114L, -507915904L, -2098501271L, 274890203L, -1043876564L, 
774618938L, -2110508561L, 9159801L, 220575502L, -129895716L, 
2128810317L, 1745964215L, 1861899840L, 1174730526L, -940077589L, 
1292513645L, -805318694L, -1407854184L, 2118510593L, -96024141L, 
-2007596844L, -2026551838L, 864161911L, -1320536639L, -1329193146L, 
-434410876L, 1594299445L, 1026954271L, 1948889976L, 374930006L, 
-1202010397L, -256122715L, 1773056322L, -69830864L, 898368345L, 
-1782937397L, 1324841276L, -1034406550L, -503038049L, -1418311127L, 
1338873022L, 1594559916L, -416632067L, -882475449L, 1039277360L, 
1523052110L, 283287163L, 1023339997L, 163728394L, -1931973336L, 
-867474543L, -817138301L, 1943458436L, -1039642446L, 920367111L, 
-291525551L, 1281539030L, -2022292812L, 1509712581L, 2000110607L, 
1608869000L, -134658650L, -540963501L, -1161312587L, 1982987282L, 
552803808L, -799014839L, -1178048901L, 268152652L, -1014158630L, 
1169338063L, -1956716903L, -705920338L, -1135321156L, 2091530419L
)