Kev luam ntawv tau muab faib ua cov txheej txheem luam ntawv, ncaj qha luam tawm thiab ncaj qha luam.
Indirect luam tawm txhais tau hais tias tus luam ntawv luam tawm ntawm qhov teeb tsa xav tau hloov mus rau tus kheej kheej ua ntej, thiab tom qab ntawd tus number case yuav hloov mus rau cov ntawv luam tawm los ntawm lub tog raj kheej. Xws li cov npe nrov hauv cov tshuab luam ntawv roj hmab yog ib qho ntawm lawv. Rau cov ntawv luam ncaj qha, cov qauv luam ntawv yog cov duab thim rov qab, thiab rau cov ntawv luam ncaj qha, kev luam ntawv yog cov duab zoo.
Raws li lub hauv paus ntsiab lus tias cov khoom luam tawm yog tsim thaum lub sijhawm luam tawm nruab nrab ntawm cov ntu luam tawm thiab cov ntu tsis ntim ntawm lub tshuab luam ntawv, nws muaj peev xwm muab faib ua ob hom: kev luam tawm lub cev (PhysicalPrinting) thiab luam ntawv tshuaj (ChmiacalPrinting).
Hauv kev luam tawm lub cev, luam ntawv number case yog ib hom kev txuam thiab kev coj ua hauv tshuab luam ntawv, thiab feem tsis muaj luam ntawv yog concave lossis convex, uas yog qhov txawv ntawm qhov siab los ntawm cov luam ntawv thiab tsis tuaj yeem ua rau ntawm tus luam ntawv, tawm hauv khoob Cov. Yog li ntawd, kev hloov pauv ntawm tus cwj mem luam tawm los ntawm cov ntawv luam tawm mus rau cov khoom siv kom luam tawm yog kev ua haujlwm ntawm lub cev thiab tshuab. Kev luam ntawv dav dav, ntawv luam ntawv luam ntawv, stencil luam ntawv, offset printing, thiab lwm yam Txhua yam yog luam tawm lub cev (cov luam ntawv nto yog siab dua lossis qis dua qhov tsis luam ntawv nto).
Kev luam ntawv tshuaj yog hais txog qhov tsis luam ntawv ntawm cov luam ntawv phaj (cov tsis luam ntawv saum npoo) uas tsis lo rau cov kua luam ntawv. Nws tsis yog vim tias ib feem tsis tshua muaj concave lossis convex lossis thaiv, tab sis vim yog cov tshuaj lom neeg, nws ua rau dej-nqus thiab xaum zaj duab xis. Cov ntu luam tawm (luam ntawv saum npoo) nqus cov kua mem thiab rov ua dej, thiab feem tsis luam tawm nqus dej thiab rov ua dua kua mem. Nws tseem yog qhov tshwm sim ntawm lub cev uas ua rau dej thiab roj rov ua kom sib dua. Txawm li cas los xij, thaum lub sijhawm luam ntawv, ntu tsis luam tawm yuav tsum tau ntxiv rau hauv kev tsim kho dej tank kom nqus dej thiab rov ua dua. Tus number case zaj duab xis yuav tsum tau ntxiv nrog cov kua qaub thiab kua nplaum los muab cov kua roj mucous acid txheej ntawm lub npov carboxy thiaj li ua kom cov xim tsis yog luam tawm ntawm cov phaj luam tawm los ntawm kev tawm tsam los ntawm roj, yog li nws yog tshuaj lom neeg luam ntawv.