{"id":107,"date":"2012-01-26T01:57:12","date_gmt":"2012-01-26T00:57:12","guid":{"rendered":"http:\/\/www.proof.de\/?p=107"},"modified":"2020-05-08T12:01:56","modified_gmt":"2020-05-08T10:01:56","slug":"normlicht-d50-oder-d50-oder-was","status":"publish","type":"post","link":"https:\/\/proof.proofen.de\/cs\/normlicht-d50-oder-d50-oder-was\/","title":{"rendered":"Standardn\u00ed sv\u011btlo a efekt metamerismu"},"content":{"rendered":"
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\n Hodnotit nyn\u00ed<\/span>\n <\/div>\n <\/div>\n

A D\u016fkaz<\/a> je tak dobr\u00fd, jak dobr\u00e9 je osv\u011btlen\u00ed, p\u0159i kter\u00e9m se na n\u011bj d\u00edv\u00e1te. Nepom\u016f\u017ee pouh\u00e9 p\u0159istoupen\u00ed k oknu nebo rozsv\u00edcen\u00ed sv\u011btla za soumraku: u okna mezi prosincem a \u010dervencem, mezi osmou hodinou rann\u00ed a osmou ve\u010dern\u00ed, mezi zata\u017eeno a slune\u010dno je obrovsk\u00fd rozd\u00edl v osv\u011btlen\u00ed, kter\u00fd znemo\u017e\u0148uje jak\u00e9koli hodnocen\u00ed barev. A ka\u017ed\u00fd, kdo zap\u00edn\u00e1 sv\u011btlo, b\u011b\u017en\u011b zap\u00edn\u00e1 \u017e\u00e1rovku s 2700 Kelvin<\/a> a - nebo je\u0161t\u011b h\u016f\u0159: \u00fasporn\u00e1 \u017e\u00e1rovka, kter\u00e1 n\u011bjak sv\u00edt\u00ed v n\u011bkter\u00fdch spektrech... katastrofa!<\/p>\n

V tisku jsou uvedeny d\u016fvody pro Metamerismus<\/a>-efekt\u016f (stru\u010dn\u011b \u0159e\u010deno: \u017ee dv\u011b barvy vypadaj\u00ed p\u0159i jednom sv\u011btle stejn\u011b, ale p\u0159i jin\u00e9m sv\u011btle zcela jinak), zejm\u00e9na v z\u00e1vislosti na r\u016fzn\u00fdch tiskov\u00fdch technologi\u00edch. Barvy, kter\u00e9 pod \u017e\u00e1rovkou vypadaj\u00ed stejn\u011b, mohou pod neonovou trubic\u00ed najednou vypadat \u00fapln\u011b jinak.<\/p>\n

V posledn\u00edch n\u011bkolika letech se Digit\u00e1ln\u00ed n\u00e1hledy<\/a> tisk na b\u00e1zi inkoustu se prosadil v oblasti n\u00e1tisk\u016f. Vzhledem k tomu, \u017ee se k tisku pou\u017e\u00edv\u00e1 inkoust, mus\u00ed se pou\u017e\u00edvat speci\u00e1ln\u011b nat\u00edran\u00fd pap\u00edr, kter\u00fd se v \u017e\u00e1dn\u00e9m p\u0159\u00edpad\u011b nepodob\u00e1 n\u00e1sledn\u00e9mu tisku. Ka\u017ed\u00fd, kdo se n\u011bkdy pokusil tisknout na leskl\u00fd nat\u00edran\u00fd pap\u00edr pomoc\u00ed inkoustov\u00e9 tisk\u00e1rny, v\u00ed: inkoust nikdy nevydr\u017e\u00ed! Proto se p\u0159i tisku zku\u0161ebn\u00edho v\u00fdtisku v\u017edy jedn\u00e1 o metamerii. Ofsetov\u00fd tisk<\/a> by m\u011bly b\u00fdt porovn\u00e1v\u00e1ny.<\/p>\n

D\u016fle\u017eit\u00e9 je zejm\u00e9na to, v jak\u00e9m sv\u011btle se na zku\u0161ebn\u00ed a v\u00fdrobn\u00ed s\u00e9rii pohl\u00ed\u017e\u00ed.<\/p>\n

Norma ISO 3664 upravuje normalizovan\u00e9 osv\u011btlen\u00ed, kter\u00e9 je nutn\u00e9 pro posuzov\u00e1n\u00ed D\u016fkazy<\/a> a tisk je d\u016fle\u017eit\u00fd. T\u00edmto D50<\/a> ji\u017e ne D50: Mezin\u00e1rodn\u00ed komise pro osv\u011btlen\u00ed CIE v posledn\u00edch letech revidovala normu ISO 3664 a p\u0159izp\u016fsobila ji dne\u0161n\u00edm podm\u00ednk\u00e1m. Jestli\u017ee v minulosti byly UV slo\u017eky p\u0159\u00edsn\u011b zak\u00e1z\u00e1ny, nyn\u00ed jsou sou\u010d\u00e1st\u00ed normy. Proto\u017ee v minulosti se kladl d\u016fraz na shodu diapozitivu a tisku, zat\u00edmco dnes se klade d\u016fraz na monitor, Digitalproof<\/a> a ofsetov\u00fd tisk jsou d\u016fle\u017eit\u00e9. Proto je t\u0159eba n\u00e1tisky v\u017edy prohl\u00ed\u017eet v norm\u011b D50, aby bylo zaji\u0161t\u011bno, \u017ee jsou skute\u010dn\u011b \"barevn\u011b p\u0159esn\u00e9\".<\/p>\n

Pro ty, kte\u0159\u00ed by cht\u011bli ov\u011b\u0159it \u00fa\u010dinky metamerismu, je k dispozici aplikace Sv\u011bteln\u00fd indik\u00e1tor UGRA<\/a> doporu\u010duje se. Pomoc\u00ed t\u011bchto prou\u017ek\u016f lze velmi rychle a p\u0159ehledn\u011b zkontrolovat \u00fa\u010dinky metamerismu.<\/p>","protected":false},"excerpt":{"rendered":"

D\u016fkaz je tak dobr\u00fd, jak dobr\u00e9 je osv\u011btlen\u00ed, p\u0159i kter\u00e9m je prohl\u00ed\u017een. Prost\u011b j\u00edt k oknu nebo rozsv\u00edtit sv\u011btlo za soumraku je k ni\u010demu: u okna mezi prosincem a \u010dervencem, mezi osmou hodinou rann\u00ed a osmou ve\u010dern\u00ed, mezi zata\u017eeno a slune\u010dno, je obrovsk\u00fd rozd\u00edl v osv\u011btlen\u00ed, kter\u00fd znemo\u017e\u0148uje jak\u00e9koli posouzen\u00ed barevnosti. A pokud rozsv\u00edt\u00edte sv\u011btlo, obvykle rozsv\u00edt\u00edte \u017e\u00e1rovku s 2700 kelviny - nebo je\u0161t\u011b h\u016f\u0159e: \u00faspornou \u017e\u00e1rovku, kter\u00e1 n\u011bjak sv\u00edt\u00ed v n\u011bjak\u00e9m spektru ... katastrofa! V tisku ... <\/p>\n

P\u0159e\u010dt\u011bte si v\u00edce<\/a><\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[18,25,437,7,442],"tags":[533,277,1054,551,47,525],"class_list":["post-107","post","type-post","status-publish","format-standard","hentry","category-haufige-fragen","category-licht-und-normlicht","category-proof-software-und-technik","category-proof-wissen","category-prozessstandard-offsetdruck-proof-wissen","tag-d50","tag-farbtemperatur","tag-farbtemperatur-indikator","tag-metamerie","tag-normlicht-2","tag-ugra","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","no-featured-image-padding"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t