CorelDRAW (Bai 41).

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CorelDRAW (Bai 41)

Du xac dinh mau theo mo hinh nao (CMY, RGB, HSB,...) neu ban in hinh khung (ma ta da ve) ra giay bang may in mau de ban (desktop color printer) duoc noi voi may tinh cua minh, Corel DRAW cung tu dong chuyen doi mau cua hinh khung sang dang thuc CMYK. Bo bon tri so CMYK dien dat mau hinh khung se giup may in dieu khien lieu luong muc tu bon hop muc CMYK de tao ra mau can thiet tren giay..

CorelDRAW (Bai 41) - Ban co dau.
CorelDRAW (Bai 41) - Ban khong dau.
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CorelDRAW (Bai 41).

CorelDRAW (Bai 41).


 
Mau pha va mau chong

Du xac dinh mau theo mo hinh nao (CMY, RGB, HSB,...) neu ban in hinh khung (ma ta da ve) ra giay bang may in mau de ban (desktop color printer) duoc noi voi may tinh cua minh, Corel DRAW cung tu dong chuyen doi mau cua hinh khung sang dang thuc CMYK. Bo bon tri so CMYK dien dat mau hinh khung se giup may in dieu khien lieu luong muc tu bon hop muc CMYK de tao ra mau can thiet tren giay.

Tuy nhien, khong phai muc tu cac hop muc khac nhau duoc pha tron voi nhau truoc khi ap len giay. Moi cham mau tren giay thuc ra la su sap xep theo trat tu nao do cua cac cham mau CMYK li ti nam canh nhau. Nho vay, ban co ao giac ve mau sac bat ky trong khi may in chi co bon mau muc khac nhau. Voi may in co do phan giai  cang cao, mat ta cang khong the nhan ra cac cham mau CMYK tach biet va ao giac mau sac cang duoc cung co. Day qua thuc la su van dung tuyet voi cua nguyen ly mau phan xa. Can chu y rang nho co thanh phan K, viec dieu khien "do den" cua cham mau boi muc den to ra hieu qua hon (tiet kien muc tot hon) so voi truong hop chi dung ba mau muc CMY.

Trong ky thuat  in lua (silk screen printing), moi chuyen lai khac. Nguoi ta pha tron thuc su cac loai muc voi nhau de dat duoc mau can thiet truoc khi ap len giay. Noi khac di, mau ma ban thay trong ban in trong truong hop nay thuc su la mau cua muc. "Mau thuc su" nhu vay duoc goi la mau mang (spot color) hoac mau pha (premixed color). De phan biet, "mau ao giac" tao boi su "chong chat" cac cham mau CMYK can ban duoc goi la mau cham (process color) hoac mau chong (mixed color). Trong ky thuat  in cong nghiep, nguoi ta dung ca hai loai mau vua neu, mau pha cung nhu mau chong.

Mau dung trong ky thuat  in bon mau (four-color printing) chinh la mau chong. Doi voi ban in hai mau nhu truong hop in bao hang ngay, ngoai mau den cua chu, ban con thay co mot mau nua o cac mang cho nay, cho kia. Cach goi "mau mang" bat nguon tu day. Noi khac di, mau trong ky thuat  in hai mau la mau mang hay mau pha. Neu nhin cac to bao in  hai mau, ban cung thay co nhung mang mau dam nhat khac nhau. Trong truong hop nay, cac sac do khac nhau cua mau pha chang qua la ao giac tao boi cau truc cham thich hop. Cau truc cham cang thua, ban thay mau cang nhat. Nhu vay, noi cho cong bang, ky thuat  "gia mau" (tao mau "ao giac") cung duoc ap dung doi voi mau pha.

Ghi chu

• Trong ky thuat  in cong nghiep, ban in hai mau can duoc in qua hai luot (pass) voi hai ban phim  tach mau. Ban in bon mau can bon luot in voi bon ban phim  tach mau. Di nhien, so luot in cang nhieu, kha nang in lech cang de xay ra va chi phi cang cao.

• Co the ban con nghe noi ve ban in nam mau, sau mau. Day thuong la ban in bon mau voi mot hoac hai luot in bo sung nham tao ra them mot so mang bang mau pha, bao dam co duoc mau that chinh xac  cho chi tiet nao do (neu co yeu cau nghiem ngat). Ngoai ra, ngay nay nguioi ta con phat trien ky thuat  in chong sau mau (hexachrome printing) CMYKOG, trong do O va G la viet tat cua Orange (cam) va Green (xanh chuoi), nham tao ra ban in mau chat luong  cao.

Co the ban nghi viec dung mau pha hay mau chong la chuyen o xuong in, khong lien quan gi den cong viec  cao cap cua ta trong Corel DRAW. Thuc ra, ngay khi chon mau trong Corel DRAW, neu ban du tinh dung dan viec dung mau pha hay mau chong, Corel DRAW se giup ban tao ra cac ban in tach mau chinh xac.

Cu the, ban da to mau hinh khung theo mo hinh CMYK tuc la da dung mau chong. CorelDRAW se giup ban tao ra bon ban in tach mau ung voi bon thanh phan CMYK. Neu ban dung cac mau pha trong ban ve nao do, CorelDRAW cho phep tao ban in tach mau ung voi moi mau pha.

“Hay nhi! The thi lam sao de to hinh khung hien co bang mau pha? Lay mau pha o dau?”. Rat don gian, ban lam nhu sau...

Chon hinh khung (neu hinh khung khong o trang thai “duoc chon”)

 

An Shift+F11

Mo hop thoai Uniform Fill

Chon the

Palettes

Bang mau PANTONE hien ra (hinh 1)


Hinh 1   Bang mau pha PANTONE

Bang mau pha PANTONE (PANTONE Spot Color Palette, PANTONE Matching System) gan nhu duoc xem la bang mau pha chuan trong nghe in, do cong ty  san xuat muc in PANTONE de ra. De chon mau pha PANTONE, ban phai co “so tay mau mau PANTONE” (PANTONE swatch book) trong do in san khoang vai ngan o mau PANTONE voi ten goi xac dinh (kem theo huong dan  ve cach pha tron tuong ung). Nho xem truoc mau mau in tren giay, ban co the hinh dung chinh xac mau ta chon cuoi cung se xuat hien tren ban in nhu the nao. Dua tren cung mot chuan, ban se lam viec  “an ro” voi nguoi pha mau.

Tren hop thoai Uniform Fill, muon chon mot mau pha PANTONE, ban co the bam vao cho nao do tren thanh doc trinh bay pho mau PANTONE de dinh vi so luoc. Cac sac mau PANTONE cu the se hien ra ben canh de ban chon ky cang hon. Moi o mau deu co ghi ten tuong ung, giong nhu trong so tay PANTONE. Thong thuong, nguoi ta lua mau trong so tay PANTONE truoc, roi dua vao ten mau ghi o do de chon mau trong hop thoai Uniform Fill.

Neu muon chon sac nhat hon cho mau PANTONE nao do (trong khi cac o mau PANTONE ke can khong dap ung duoc), ban go tri so phan tram vao o nhap lieu Tint tren hop thoai Uniform Fill. Tri mac dinh la 100% ung voi mau PANTONE duoc to thanh mang tron. Nghia la trong ban in tach mau ung voi mau PANTONE dang xet, mang mau PANTONE 100% ay xuat hien duoi dang mang “den thui”. Neu ban go tri so 50 (tuc 50%) trong o Tint chang han, ta co mau nhat hon 50%. Mang mau nhat nay se xuat hien duoi dang mang cham den trong ban in tach mau ung voi mau PANTONE dang xet. Neu ban dung ca mang tron lan mang nhat cua mau PANTONE nao do trong ban ve cua minh, cac mang nhu vay se nam tren cung mot ban in tach mau, trong do mang tron la mang “den thui”, mang nhat la mang cham den. Bang cach nhu vay, chi trong mot luot in, ban da co hai mau! Noi dung hon la hai sac cua mot mau. Ma khong chi co hai, ban co the tuy y dung nhieu sac khac nhau bang cach go tri so giua 0% va 100% trong o Tint cua hop thoai Uniform Fill.

Gia su ban xem so tay PANTONE va khoai mau PANTONE 284 C. The thi tren hop thoai Uniform Fill, ban hay...

Bam vao o Name va go 284 c

Ten mau PANTONE 284 C xuat hien trong o Name (hinh 2). Mau nay hien thi trong o New Color

Chon OK

Dong hop thoai Uniform Fill. Hinh khung cua ban gio day duoc “han hanh” to mau PANTONE 284 C

Lai gia su rang ban chua ung y va muon co mau nhat hon chut it...

An Shift+F11

Mo hop thoai Uniform Fill, ban thay ngay bang mau PANTONE

Bam vao o Tint, go 80 va chon OK

Mau to PANTONE 284 C cua hinh khung nhat di (tren ban in, mau pha PANTONE 284 C chi con bao phu co 80 % dien tich hinh khung)


Hinh 2

Tren hop thoai Uniform Fill, ban de y, CorelDRAW trinh bay bo ba tri so RGB va bo bon tri so CMYK tuong ung voi mau pha PANTONE duoc chon. Bo bon tri so CMYK nhu vay se duoc dung khi ban in ban ve bang may in mau de ban. Tuy nhien, trong truong hop nay vi CorelDRAW ghi nho chinh thuc mau cua doi tuong theo ten trong he thong  PANTONE, nguoi ta quen noi rang doi tuong “co mau PANTONE”, chu khong “co mau CMYK”.

Viec chon mau PANTONE co the lam ban thac mac: “Viec gi phai lua mau truoc trong so tay PANTONE ma khong chon ngay tren bang mau PANTONE cuc dep duoc hien thi trong hop thoai Uniform Fill?”. Ban se hieu ngay vi sao khi quan sat ban in tren giay thu duoc tu may in mau de ban. Duong nhu he thong  “hien dai” cua ta da chinh xac  khong che vao dau duoc nhung mau hinh khung tren giay lai khong giong mau hinh khung tren man hinh! Vang, su xac dinh mau mot cach duy nhat bang bo bon tri so CMYK thuc ra khong du de ban thay cung mot mau tren man hinh  va tren may in. Viec the hien mau sac von chiu tac dong cua nhieu yeu to hon ta tuong. Khong chi cac may in mau khac nhau in cung mot mau cho ket qua hoi khac nhau, mau hinh khung hien co cua ban cung se duoc the hien hoi khac nhau tren cac man hinh  khac nhau (cho du cung mot nhan hieu). Do vay neu ngam mau tren man hinh  de chon mau in (theo kieu “trong mat ma bat hinh dong”), ban hau nhu khong tranh khoi that vong  ve ket qua cuoi cung  tren giay.

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Updated: 02/03/2008 | Views: 428 | Comments: 0

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Hien tai chua co binh luan nao ve bai viet CorelDRAW (Bai 41)!

Ban co y kien gi ve bai viet CorelDRAW (Bai 41) nay? Hay goi suy nghi, binh luan, danh gia, loi khuyen ... cua ban ve bai viet CorelDRAW (Bai 41) ban tai day.

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