Sovuq Foil For Offset the development of computer ink color matching system and the principle of color matching

 

siyoh ning rangi bitta bo'lib kalit ko'rsatkichlari ta'sir qiladi bosilgan materiyaning sifati 2c shuning uchun, the allocation of ink bosmadan oldin zarur jarayonga aylandi. Rang mos mos lanishi bo'lgan rang printsipi asosida bo'ldi ta'limot rang sintezi va rang aralashtirish. bilan elektron kompyuter texnologiyasi 2c kompyuterlar ning saqlanishi a katta miqdori ma'lumotlar, bilan yuqori tezlikdagi hisoblash imkoniyatlari, bilan yordam of the the colorimetry to a large number siyoh basic bilan ma'lumotlar va rang qiymatlari uchun ishlov berish, orqali inson-kompyuter dialogi rangi mos keladigan, tezkor tezlik, yuqori aniqlik, tezligi uning chop etish maydoni, mumkin make color management and quality detection more modern.

 

Birinchi% 2c the development and characteristics of computer color matching

 

1. The development of computer color matching

Sanoatda rivojlangan davlatlar, rangli bog'liq sanoat, kabi to'qimachilik bosib chiqarish va bo'yash, bo'yoqlar, pigmentlar, qoplamalar ishlab chiqarish, plastik rang ishlov berish va siyoh sanoati umuman foydalanish kompyuter rangi mos tizimlar as a kuchli vosita uchun mahsulot ishlab chiqish, ishlab chiqarish, sifat nazorati va sotish, va the mashhurlik stavkasi yuqori. Misol uchun, so'nggi yillarda, chet el optik asboblari kompaniyalari ishlab chiqilgan Gerinda Macbeth siyoh formulasi dasturi InkFormulation4.0, qaysi tayyorlash mumkin aniq formulalar uchun tayyorlash ofset bosib chiqarish, flexografik bosib chiqarish, ekran bosma 2c ekran bosib chiqarish va rotorli gravür bosma sanoat. It da avtomatik formulaning xususiyatlari mavjud va tezkor ko'p kanalli hisoblash tezligi, va mumkin tez tayyorlash arzon formulalar. interfeysi of the software window is friendly, and the formula is to'g'ri va the success rate of one preparation is guaranteed.

 

In the o'tgan 10 yil, turli modellar rang mos tizimlari kiritildi xitoyda 2c lekin sezilarli foyda erishildi. The dastur chet elda ishlab chiqilgan dasturiy ta'minot ga asoslangan xususiyatlar ga asoslangan the the processing industry in Europe and the United United States, and the color quality is nisbatan barqaror. Mahalliy qayta ishlash sanoati o'z xususiyatlariga ega bo'lsa-da, ning stability of the color quality is nisbatan kambag'al, bog'langan bilan to'qnashgan rang materiallari doimiy yangilanib turadi 2c a katta raqami of of yangi substratlar paydo 2c va mavjud rang mos tizim at uyda va chet elda yo'q moslashuvchan sozlash qobiliyati, shunday ki the amaliy application of the color matching system duch keldi qiyinchiliklarga duch keldi.

 

Shenyang Research Institute of Chemical Industry to study the color matching system in 1984, among the thinking color matching chinese software is the the earliest chinese color matching software in China. Using the software system , the domestic machine is 1/3 of of of the butun system, agar u mos bilan mos kelsa the import mashina, the total price is 1/2 of of imported mashina. Tizim hozir ishlatiladi dan ortiq 70 ishlab chiqaruvchilar, qoplama bo'yoqlari, bosib chiqarish va bo'yash, jun burg'ulash, bichish, bo'yoq, siyoh, kauchuk, devor qog'ozi va ko'p bo'yoq boshqa rang bilan bog'liq sanoat. Qo'shimcha, Xi 'an Universitet of Technology ishlab rivojlangan a zichlik kompyuter rangi mos tizimi yordamida the color densitometer and computer connection, qaysi mavjud mavjud qulaylik va universalligi of ommaboplik va dastur. From the current development trend, computer color matching become an important part of the future ink color matching.

 

2. Xarakteristika of computer color matching

 

(1) It kamayishi mumkin rang mos vaqt, kamaytirish narxi, va yaxshilash the color matching efficiency.

 

(2) Can calculate the correction formula in a short time.

 

(3) All the ink colors that have been matched in the past are stored in the database, and can be immediately used when needed.

 

(4) Easy to operate.

 

(5) The calculation of color formula and color difference are digitally displayed or printed out by the computer, and the final color matching results are also stored the memory in digital form.

 

(6) Can be connected to other funktsional sistemalar. Misol uchun 2c the weighing system be ulanishi mumkin ga minimize the weighing error; Takrorlanishi yaxshilangan, agar jarayon bo'lsa yaxshilanadi is doimiy, the bosma sifatli nazorat tizimi mumkin o rnatilgan on the printed mahsulot, va har qanday anormal vaziyat sodir bo'lganda 2c u darhol to'xtaydi va keraksiz chiqindilarni kamaytiring.

 

Ikkinchi, kompyuter rangi mos printsip va tizim

 

1.Kubelka-Munk teoremasi va uning cheklanishlari

K-M teoremasi taklif qilingan as erta 1931, lekin u 1958 yilgacha bo'lmagan edi u boshlandi bo'lishi muvaffaqiyatli ishlatilgan to'qimachilik bosma va bo'yash sanoati, va the printing industry began to 1970s the 1970s the 1970s.

 

% 0a kompyuter rangi mos sistema tomonidan ishlab chiqilgan the United States, Japan and other countries basically still uses this theory.

a seriyasi of derivation of K-M teoremasi, the simplest form of of function and its derivative form suitable for color matching calculation are given:

 

K/S=(1-r)2/2r

r=K/S+1-[(K/S+1)2-1]1/2

Qaerda r ifodalaydi the reflectance at wavelength; K is the absorbption coefficient, bu the light absorbption rate of the mikroelement qalinligi dielektrik qatlam keyin the 2c 2c 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 bo'ladi hodisa diffuzed yorug'lik yorug'lik in an cheksiz qalin tekis o'rta. S bo'lgan taranglik koeffitsent, vakili the tarang nur tezligi by by qalinligi element element.

 

So far, the basic principle of computer color matching (CCM) still follows K-M theory. Misol uchun, spektral ko'rish moslashish usuli, kompyuter aks ettirish spektr rang moslashish usuli, kompyuter rangi moslashish yaqinlashish al Gʻorim barchasi barcha asoslangan ga asoslangan K-M teoremasi. Biroq, in in the practical application of K-M theory, there 2c u erda koʻpincha farqlar oʻrtasida nazariy hisoblash va beton amaliyot, boʻlishi mumkin boʻlishi mumkin ikki faktor.

 

K-M teoremasi o'z o'zidan olingan ma'lum taxminlar ostida.

Birinchi, agar qalinligi the color layer is x va the light falls on any element layer dx, the reflection by the interface ning olib qo'yilmagan hisobi. As a result, the color layer applying the color layer applying applying the color 2c reflektori teorema o'rta bilan bir xil refraksiyon indeksi bilan ichiga cho'milgan botiriladi. Bu algoritm, qaysi e'tiborsiz the different refraction indeks on on the interface in order to to soddalashtirish muammo 2c may xato lar..

 

Ikkinchi, dx is har qanday element qatlam ichidagi qalinligi the color layer x, shunday the absorbsiya koeffitsient va taranglik olingan koeffitsient are are lar hisoblangan bir xil va bir xil butun bo'ylab rang qatlam ishlatiladigan 2c lekin bu taxmin uchun qo'llash qiyin bo'ladi yo'q bo'lish yoki yarim yo'q bo'lib ketish yog'li materiallar.

 

Uchinchi, the colorant particles in the colorant layer are disordered, shunday ki the light in the color layer become a diffuz forma, and the particles are batt batsed the diffusion effect%1 2c natijada yuqori va pastki kanallarda paydo bo'ladi. Biroq, in amaliy dastur, 2c qachon zarralar mavjud the the thin film shakli of yog film, eng ularning ular 1 1 1 1 1 1 1 2c yo'nalishida joylashtirilgan 2c yo'nalishida 2c bo'ladi u bo'ladi sababi ikki kanallarning yorug'lik oqimi taxmin bo'ladi.

 

Toʻrtinchi, on the thin color layer, the light has the interior of the color layer without time to stter, in the dark tone, a considerable yorug'lik miqdori yorug'lik miqdori so'rilgan oldingi tarqalish, shunday bu nurlar kirish the color layer are emas diffuzed, natijada a katta farq in tajriba natijalari.

 

The printing industry must consider the interaction between light and pigment particles and the physical properties of ink when describing the ink superposition effect. In practical application, it should be said that the K-M theory contains two double constants, respectively, the absorption coefficient K and the scattering coefficient S. The scattering ability of the ink to light can be ignored compared with the scattering ability of the substrate, so the color principle of the ink is mainly the selective absorption of the ink to the light, and the absorption capacity of the ink to the incident light is affected by the thickness of the ink layer and the ink concentration. The K-M theory is put forward on the premise of opaque media, and the inks used in printing are transparent or semi-transparent, so the K-M theory has great shortcomings.

 

2. The use of three stimulus values for computer ink color matching

(1) tri-stimul qiymati rang mos kelishi

ko'rinishida the cheklov of K/S va the the xususiyatlari of printing sanoati, bu qog'oz presents a method of color matching using tristimulus qiymat. Bu metod foydalanmaydi K/S qiymati, akslantirish va boshqa rang ko'rsatkichlari, lekin faqat foydalanish tristimulus qiymati sifatida rang ko'rsatkichlari.

 

On the the basis of K/S teorema, tristimulus value color matching also be carried out, lekin u zarur to lashga zarur k/S qiymati va konsentratsiyasi 2c va o'rganish orasidagi munosabat 2c tristimulus qiymat va konsentr, bo'lgan 2c bo'lgan munosabat o'rtasidagi munosabat tristimulus qiymati va dot foiz. In bosma, the asosiy usullar of converting between trististimulus value and dot percentage are Newjberg equation konversion, matritsa change konversiya va lookup table konversiya. In this paper, xromatografiya ga ishlatiladi to rnatish uchun lookup table for konversion.

 

(2) Uch-stimul qiymati rang mos printsipi

Ko'ra ciE standart colorimetriya tizimi, har qanday rang tabiatda spektral tristimulus qiymatlari X, Y, va Z hozirgi, eng rivojlangan bo'lishi mumkin rang o'lchash asboblari foydalanish foydalanish bu xromatiklik tizimi, bo'lgan har qanday ob'ektning rangi 2c har qanday ob'ektning rangi bo'lishi mumkin uchlik stimul qiymati X10, Y10, Z10. Kompyuter rang mos kelishi ning printsipi asosan to 2c ning printsipi 2c agar uchta stimul qiymat lari X10, Y10 va Z10 of ikki rang namunalari teng 2c the two are the color the color.

 

lookup jadval by xromatografiya bilan o'rnatilgan munosabat trististimulus ning qiymati va the percentage of dot of rangli siyoh. a ma'lum rang namunasi tomonidan ustiga bosib qo'yilgan siyoh a, b va c, va c, lar bu uchta siyoh ning dot foizi 1 l, m va n, mos, shunda 2c siyoh A 2c b va c 2c b va c 2��m∶n, va the the 2c va the the 2c 2c 2oq siyoh hisob for (1-l)+({{2}m)+({{4 }}n). Bu rang mos mos tizim foydalanadi the the CIE standart light source D65 and 10 degree field of view, and uses the CIELAB color farq formula: ΔEab{{7{7}}[(ΔL){{8{8%% 7d}(Δa){2+}}(Δb)2]1/2 to to hisoblash the color orasidagi farq standart rang namunasi va mos keladigan rang namunasi.

 

ko'rishimiz mumkin ki foydalanish uchun uch stimuli uchun kompyuter rangi mos kelishi mumkin rang ning rangi to rang to be matched in a specific light source by 2c data there var a ga mos munosabat orasidagi qiymat orasidagi uch stimul of the color sample and the siyoh ratio, va formula bilan formula hisoblash mumkin bilan rang farq testi test u talablarga javob beradimi yo'qmi.

 

(3) uch-stimul qiymati rang mos usuli

tristimulus values of color blocks and the dot percentage of each ink by input the computer to establish a basic database. When color matching, the tri the target color sample is kirish ichiga kirish tizimga 2c the system calculates the mixed ink and uning proportion, and outputs the formula prediction result. siyoh namunasi ning rangi mos kelishi natijasi quritilganda 2c the uch-stimul qiymati o'lchanadi, va ajoyib farq hisoblanadi hisoblanadi . tomonidan kompyuter shunga muvofiq rang farq formula formula, va yanada to'g'irlangan yo'riqnomalar tez formulalanishi mumkin bilan yuqori sifatli heterochromatik spektr ranglar.

 

shartlari bo'yicha sifat talablari rang reproduktsiya, ga muvofiq 2c talablarga muvofiq the national standard for the color difference Δ *ab of of the blank of color bezatish prints prints, this paper selects ΔE*ab Less than or equal 3.

 

 

3. Kompyuter rang mos tizimi

(1) The function of the color matching system

Kompyuter rangi mos tizimi is a zamonaviy jihozlar integrallash rang o'lchash asbobi, kompyuter va rang mos dasturiy tizim. The basic role of computer color matching is to store the color data of the in color matching in the computer in the computer in advance, and then calculate the mixing ratio of the color of the sample with these siyoh to erishish uchun oldindan belgilangan formulaning maqsadi ga erishish .

 

(2) Kompozitsiya of the color matching system

% e2% 91� Hardware part of the computer color matching system

Kompyuter: Foydalanish Windows operatsion tizimi, qattiq disk saqlash maydoni of kamida 20MB; Spektrofotometr; The color spectrum.

 

% e2% 91� Kompyuter rangi mos keladigan dasturiy tizim

Dastur asosiy menyu: displey dastur katalogi the color matching system software, shunday ki operatori ga ega a umumiy tushuncha of 2c dasturi rang mos dasturiy ta'minot, shunday shunday ki operator tanlashi mumkin va qo'ng'iroq dastur ko'rsatilgan katalog ga mos o'z maqsadlariga mos .

 

Asosiy ma'lumotlar fayl: Foydalanish Microsoft Access to yaratish ma'lumotlar bazasi fayllari, shu jumladan ikki rang bosib chiqarish, uch rangli bosib chiqarish va spot color overprint 3 qismlar.

Hujjat ichiga basic data file establishment, management, data processing part and formula storage programmasi kiradi.

 

% e2% 91� formula hisoblash va tuzatish

Qo'ng'iroq bu programma to hisoblash the color difference between the color matching sample and the standard sample, select the formula according the color difference, and modify the formula.

 

color matching system software has a strong man-machine dialogue function, and the operator can input the mos parametrlari and data according the prompts on the computer screen to get the required siyoh formulasi.

 

Color matching is a complex technical engineering involving light color theory, ink, paper, process and other aspects, the use of chromatography for three-stimulus value color matching, overcome the limitations of K-M theory, suitable for the characteristics of the printing industry, reduce the burden of color matching personnel, improve the product color quality, color matching speed, accuracy, and increase economic benefits. Although there are still a lot of areas to be improved, such as the difference in color difference calculated by the tristimulus value color matching under different light sources, the color matching accuracy has a great relationship with the accuracy of the chromatography. However, with the continuous update of computers, more sophisticated instruments, the continuous emergence of various mathematical methods and the gradual standardization and data of materials, computer color matching will inevitably show unparalleled advantages.