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发表时(shi)间(jian): 2021-03-23 09:31:11
作者(zhe): 河南(nan)力王包装
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怎样分(fen)辨画册(ce)印刷的好坏
1、先看(kan)样品(pin)(pin)再看(kan)画册(ce)印(yin)刷品(pin)(pin)和(he)先看(kan)印(yin)品(pin)(pin)再看(kan)样品(pin)(pin),其结果会略有不同(tong)
分两次看(kan)一(yi)种色(se)(se)(se)(se)时感(gan)觉不一(yi)样。这(zhei)种现(xian)象叫做(zuo)先(xian)后(hou)颜(yan)色(se)(se)(se)(se)对比反(fan)(fan)应(ying)。为什(shen)么会出现(xian)先(xian)后(hou)颜(yan)色(se)(se)(se)(se)对比反(fan)(fan)应(ying)呢?这(zhei)是因(yin)为,先(xian)看(kan)的(de)(de)(de)(de)颜(yan)色(se)(se)(se)(se)使该色(se)(se)(se)(se)的(de)(de)(de)(de)色(se)(se)(se)(se)神经纤维兴奋,马(ma)上(shang)再看(kan)别(bie)的(de)(de)(de)(de)颜(yan)色(se)(se)(se)(se),其它(ta)色(se)(se)(se)(se)神经很快兴奋引(yin)起色(se)(se)(se)(se)感(gan),而(er)先(xian)看(kan)色(se)(se)(se)(se)的(de)(de)(de)(de)色(se)(se)(se)(se)神经处于(yu)兴奋后(hou)的(de)(de)(de)(de)抑制状(zhuang)态,再兴奋较(jiao)慢,引(yin)起了负色(se)(se)(se)(se)相(xiang)反(fan)(fan)应(ying)。这(zhei)种反(fan)(fan)应(ying)加上(shang)新看(kan)色(se)(se)(se)(se)的(de)(de)(de)(de)色(se)(se)(se)(se)相(xiang),形成新的(de)(de)(de)(de)色(se)(se)(se)(se),所(suo)以改(gai)变(bian)了后(hou)看(kan)颜(yan)色(se)(se)(se)(se)。而(er)且改(gai)变(bian)的(de)(de)(de)(de)色(se)(se)(se)(se)相(xiang)还是有规律,是向(xiang)先(xian)看(kan)颜(yan)色(se)(se)(se)(se)的(de)(de)(de)(de)补色(se)(se)(se)(se)方面改(gai)变(bian)。
2、光的(de)强弱直(zhi)接影响到对(dui)印刷品(pin)样(yang)张颜色的(de)判断(duan)
光(guang)的(de)(de)(de)强弱不仅对(dui)色(se)(se)(se)(se)彩(cai)的(de)(de)(de)明暗有影响(xiang),还会改变颜(yan)色(se)(se)(se)(se)的(de)(de)(de)相(xiang)(xiang)貌。平时(shi)我们(men)观察(cha)一(yi)个受光(guang)的(de)(de)(de)圆(yuan)柱,迎光(guang)的(de)(de)(de)一(yi)面为明调(diao)(diao),背(bei)光(guang)的(de)(de)(de)面为暗调(diao)(diao)。明暗的(de)(de)(de)结合部(bu)分为是(shi)(shi)中(zhong)间(jian)调(diao)(diao)。同一(yi)物(wu)体,在标准光(guang)源(yuan)下是(shi)(shi)正(zheng)色(se)(se)(se)(se),若光(guang)线逐(zhu)渐变强,其色(se)(se)(se)(se)调(diao)(diao)也(ye)(ye)随之向(xiang)明亮(liang)的(de)(de)(de)色(se)(se)(se)(se)相(xiang)(xiang)转变,光(guang)亮(liang)增强到(dao)一(yi)定程度,任何颜(yan)色(se)(se)(se)(se)都可(ke)以变为白(bai)色(se)(se)(se)(se)。黑色(se)(se)(se)(se)的(de)(de)(de)瓷(ci)器其反(fan)光(guang)点(dian)(dian)也(ye)(ye)是(shi)(shi)白(bai)色(se)(se)(se)(se)的(de)(de)(de),因反(fan)光(guang)点(dian)(dian)处光(guang)集(ji)中(zhong),并(bing)强烈地反(fan)射。同理,光(guang)线逐(zhu)渐减(jian),各种(zhong)色(se)(se)(se)(se)彩(cai)向(xiang)明度低的(de)(de)(de)色(se)(se)(se)(se)相(xiang)(xiang)转变,光(guang)减(jian)弱到(dao)一(yi)定程度,任何颜(yan)色(se)(se)(se)(se)都会变成(cheng)黑色(se)(se)(se)(se),因物(wu)体不反(fan)射任何光(guang)就(jiu)是(shi)(shi)黑色(se)(se)(se)(se)的(de)(de)(de)。表(biao)1表(biao)示的(de)(de)(de)就(jiu)是(shi)(shi)光(guang)的(de)(de)(de)强弱对(dui)色(se)(se)(se)(se)彩(cai)的(de)(de)(de)影响(xiang)。印刷车间(jian)的(de)(de)(de)看样台必(bi)须符(fu)合要(yao)求,一(yi)般要(yao)求照度达到(dao)100LX左右,才能(neng)正(zheng)确识别颜(yan)色(se)(se)(se)(se)。
3、色光下(xia)看(kan)样与日(ri)光下(xia)看(kan)样是有差异(yi)的
在实际生产过程中,多(duo)数是(shi)在电源(yuan)的照射下工作,而每种光(guang)(guang)(guang)源(yuan)均带有一定颜色(se)。这就给正确判断原(yuan)稿或产品(pin)(pin)颜色(se)带来一定困(kun)难(nan),色(se)光(guang)(guang)(guang)下观(guan)(guan)色(se),色(se)彩变(bian)(bian)(bian)(bian)(bian)化(hua)一般是(shi)相同色(se)变(bian)(bian)(bian)(bian)(bian)浅(qian),补(bu)色(se)变(bian)(bian)(bian)(bian)(bian)暗,例如(ru):红(hong)(hong)(hong)光(guang)(guang)(guang)下观(guan)(guan)色(se),红(hong)(hong)(hong)变(bian)(bian)(bian)(bian)(bian)浅(qian),黄(huang)(huang)(huang)(huang)变(bian)(bian)(bian)(bian)(bian)橙,绿(lv)(lv)变(bian)(bian)(bian)(bian)(bian)暗,青(qing)变(bian)(bian)(bian)(bian)(bian)暗,白(bai)变(bian)(bian)(bian)(bian)(bian)红(hong)(hong)(hong)。绿(lv)(lv)光(guang)(guang)(guang)下观(guan)(guan)色(se),绿(lv)(lv)变(bian)(bian)(bian)(bian)(bian)浅(qian),青(qing)变(bian)(bian)(bian)(bian)(bian)浅(qian),黄(huang)(huang)(huang)(huang)变(bian)(bian)(bian)(bian)(bian)绿(lv)(lv)黄(huang)(huang)(huang)(huang),红(hong)(hong)(hong)变(bian)(bian)(bian)(bian)(bian)黑,白(bai)变(bian)(bian)(bian)(bian)(bian)绿(lv)(lv)。黄(huang)(huang)(huang)(huang)光(guang)(guang)(guang)下观(guan)(guan)色(se),黄(huang)(huang)(huang)(huang)变(bian)(bian)(bian)(bian)(bian)浅(qian),品(pin)(pin)红(hong)(hong)(hong)变(bian)(bian)(bian)(bian)(bian)红(hong)(hong)(hong),青(qing)变(bian)(bian)(bian)(bian)(bian)绿(lv)(lv),蓝(lan)变(bian)(bian)(bian)(bian)(bian)黑,白(bai)变(bian)(bian)(bian)(bian)(bian)黄(huang)(huang)(huang)(huang)。蓝(lan)光(guang)(guang)(guang)下观(guan)(guan)色(se),蓝(lan)变(bian)(bian)(bian)(bian)(bian)浅(qian),青(qing)变(bian)(bian)(bian)(bian)(bian)浅(qian),绿(lv)(lv)变(bian)(bian)(bian)(bian)(bian)暗,黄(huang)(huang)(huang)(huang)变(bian)(bian)(bian)(bian)(bian)黑,白(bai)变(bian)(bian)(bian)(bian)(bian)蓝(lan)。在印(yin)刷(shua)车间,一般都选择色(se)温(wen)较(jiao)高(3500~4100K),显色(se)系(xi)数较(jiao)好的日(ri)光(guang)(guang)(guang)灯(deng)作为(wei)看样(yang)光(guang)(guang)(guang)源(yuan),但(dan)要注意日(ri)光(guang)(guang)(guang)灯(deng)略偏蓝(lan)紫色(se)。