Ma pixels mu masentimita? Choyamba ...

Chifukwa chakuti pafupifupi aliyense wa ife tsopano, ngati alibe foni, kamera yadijito kapena piritsi yomwe ili ndi kamera yotsika kwambiri, tsopano kulanda kamphindi kalikonse ka moyo pa chosonkhanitsa kunyumba si vuto. Panthawi yomweyi, pakuyika magawo a zithunzi pamagetsi, ambiri akuganiza momwe angasinthire ma pixel kuti akhale masentimita. Mukaika chisankho kukhala chokwera kwambiri, simungapeze chipinda chochepa cha chithunzicho, ndipo kutumiza iwo pa intaneti kungakhale yaitali komanso kovuta chifukwa cha kukula kwakukulu. Kumbali inanso, kusamvetsetsa kochepa nthawizonse kumatanthauza khalidwe losauka.

Ma pixels pa sentimita imodzi: kodi ndifunika kudziwa chiyani kuti ndimasulire?

Choyamba muyenera kumvetsa bwino pixel. Ndipotu, ichi ndi chinthu chochepa kwambiri pa chithunzi cha bitmap. Mwa kuyankhula kwina, iyi ndi kadontho kakang'ono, kojambula mu mtundu winawake. Tiyenera kukumbukira kuti kukula kwake kwa pixel kamodzi sikunayimire ndipo kumadalira zida zamakono za chipangizochi. Kuti mumvetsetse momwe mungasinthire ma pixels mu masentimita, zimakhalabe kuti muzimvetsetsa chinthu chimodzi chofunika kwambiri chotchedwa DPI. Sichinthu china choposa kuwerengeka kwa madontho pa inchi. Powonjezereka kwambiri, chithunzichi ndi chithunzi chabwino. Musalole kuti izi zikuvutitseni inu mmalo mwa masentimita ambiri omwe mumakhala nawo masentimita kuti muyambe kugwiritsa ntchito masentimita - kusinthika kwa masentimita masentimita ndi kosavuta, mumangofunika kukumbukira chiŵerengero: 1 inchi = 25.4 mm kapena 2.54 cm. Gwiritsani ntchito dpi = 300, chifukwa kawirikawiri amakhulupirira kuti maso a munthu oposa 306 amalozera mu inchi imodzi sangawone.

Mchitidwe ndi kuchita

Titatha kupeza magawo onse ofunika kumasulira, tikhoza kupeza mosavuta njirayi kuti titembenuzire mwatsatanetsatane ma pixelisi mu masentimita. Deta yoyamba yosindikizira ingapezeke mu mafayilo katundu kapena ma kamera. Zotsatirazi ndizo: Choyamba, timagawa kutalika kwa mbaliyi mu pixel ndi dpi ndikupeza kukula kwa chithunzicho mu mainchesi, ndiyeno ndikuchulukitsa mfundo izi ndi 2.54 ndikusintha pixels mu masentimita. Monga mukuonera, kumasulira uku kuli kosavuta. Mawonekedwe oyenerawo angalembedwe mwa mawonekedwe awa:

X = 2.54 * p / dpi, kumene:

X - kutalika kwa mbali ya chithunzi mu masentimita,

P ndi mbali ya mbali pamapikseli,

Dpi - kusindikiza kusakanikirana.

Momwe mungapezere kukula kwa pixel ya chinsalu

Nthawi zina, kuti zitheke, ndizothandiza kudziŵa kuti ndi mitundu yambiri ya mtundu yomwe ili mu centimeter ya chipangizo chogwiritsidwa ntchito. Njira yophweka, ndithudi, ndiyo kupeza khalidwe ili mu malangizo. Koma bwanji ngati kale litatayidwa kunja kapena kodi izi zikusowa? Pankhaniyi, mutha kutsegula chithunzi chomwe kutalika kwake ndi m'lifupi mu pixelisi zimadziwika pasanakhale, ndikuyesa magawo omwewo ndi wolamulira. Pambuyo pake, imakhalabe kuti ipeze mgwirizano wa maphwando ndikupeza zotsatira zoyenera.

Ena amachita

Tiyerekeze kuti tikufuna kusindikiza chithunzi cha chilengedwe mu A3 maonekedwe (awiri ma sheetsiti) kuti apachike pakhoma. Kodi ndi chikhalidwe chotani chomwe chiri chithunzichi? Makhalidwe abwino a A3 ndi 297 × 420 mm (29.7 × 42 cm). Kuwerengera, timagwiritsa ntchito mtengo wa 300 dpi. Malinga ndi ndondomeko yapamwambayi: p = x * dpi / 2,54. Ndiye m'lifupi mwake chithunzicho chiyenera kukhala osachepera p = 42 * 300 / 2,54 = 12 600 / 2,54 ≈ 4 961 px, ndi kutalika: p = 29,7 * 300 / 2,54 ≈ 3 508 px.