JPEG, TIFF, PSD, BMP, PICT, PNG, thiab GIF tau piav qhia
Koj puas totaub txog hom kev kos duab twg, lossis koj puas xav paub qhov txawv ntawm JPEG , TIFF, PSD, BMP, PICT, thiab PNG?
Nov yog qee cov kev cai:
- Yog tias cov duab tau muab xa rau Web los sis mobile, siv JPEG , PNG, lossis GIF.
- Yog tias cov duab tshwm rau hauv cov ntaub ntawv luam tawm, siv TIFF.
- Yog hais tias koj xav kom khaws ib version uas tseem tshuav editable, xaiv koj tus software hom ntawv hom ntaub ntawv . xws li .PSD rau Photoshop,
Ntawm no yog cov lus qhia luv luv ntawm cov qauv ntaub ntawv tawm tswv yim, nrog cov kev txuas mus ua raws li cov lus qhia ntxiv:
Thaum twg thiaj siv JPEG
Cov Photographic Khoos Phem Photographic (JPEG los yog JPG) yog qhov zoo tshaj plaws rau cov duab thaum koj xav kom khaws cov ntaub ntawv me me thiab tsis nco txog qee qhov kev txiav txim siab rau qhov loj me me. Cov ntaub ntawv tau txais me dua li cas? JPEG feem ntau suav hais tias yog "neeg phem". Hauv cov lus yooj yooj yim, thaum tsim cov ntaub ntawv JPEG compressor ntsia rau ntawm daim duab, qhia txog cov cheeb tsam uas muaj xim thiab siv lawv li. Cov kev nce qib yog xim uas tsis ntsuas raws li ntau yog "poob," yog li cov lus ntawm cov ntaub ntawv xim nyob hauv daim duab thiaj li tseem tuaj yeem ua cov ntaub ntawv loj.
Thaum tsim cov ntaub ntawv JPG koj mas feem ntau yuav tsum teev tus nqi zoo xws li Photoshop Image xaiv uas muaj txiaj ntsig fro 0 rau 12. Txhua yam hauv qab 5 yuav muaj feem ntau tshwm sim rau ib qho duab pixel es vim tias cov nqi xov xwm loj heev yog raug pov tseg tawm los txo cov ntaub ntawv me me. Txhua yam ntawm 8 thiab 12 yog qhov kev ua zoo tshaj plaws.
JPEG tsis haum rau cov duab nrog cov ntawv nyeem, cov blocks loj loj, lossis cov duab yooj yooj yim vim cov hlua khaus yuav ploj thiab xim ua haujlwm. Tsuas yog JPEG muab cov kev xaiv ntawm Baseline, Baseline Optimized, lossis Progressive.
- Lub hauv paus (Txuj) - Hom ntawv JPEG no lees paub los ntawm tag nrho cov Web browsers.
- Baseline Optimized - Qhov kev xaiv JPEG hom no muab cov xim zoo nkauj thiab me ntsis zoo dua compression. Nws yog kev txhawb los ntawm tag nrho cov browsers niaj hnub, tiam sis nws tsis txaus siab los ntawm qhov tseem ceeb tshaj plaws ntawm qhov Web browsers. Nws yog qhov koj xaiv zoo tshaj plaws rau cov ntaub ntawv JPEG hnub no.
- Zuj zus - Tsim cov ntaub ntawv JPEG uas ua rau maj mam pom thaum pib, pib tawm ntawm blocky, thiab maj mam txais dlaim phaj ntxiv li nws downloads. Nws tsis ua cov duab download tau sai, tab sis nws muaj peev xwm muab lub illusion ntawm kev ceev txij li lub blocky duab yog loaded tam sim ntawd rau kev sib txuas qeeb. Nrog feem ntau ntawm cov neeg siv internet ntawm kev sib txuas lus hnub no, Kev Sib Zov JPEG tsis tshua muaj siv.
Thaum twg thiaj siv TIFF
TIFF (Cov duab kos duab cim duab) zoo rau txhua yam duab ntawm bitmap (pixel-based) destined rau luam vim tias hom ntawv no siv CMYK xim. TIFF ua cov ntaub ntawv loj ua tsaug rau cov kev daws teeb meem ntawm 300 ppi uas tsis muaj kev poob zoo. TIFF kuj txuag cov txheej, alpha transparency, thiab lwm yam tshwj xeeb nta thaum txav los ntawm Photoshop. Hom kev qhia ntxiv nrog TIFF cov ntaub ntawv nws txawv hauv Photoshop versions sib txawv, yog li tham txog Photoshop kev pab rau cov lus qhia ntxiv.
Thaum twg thiaj siv PSD
PSD yog Photoshop hom ntawv hom ntawv. Siv PSD thaum koj xav khaws cov khaubncaws sab nraud povtseg, cov txheej txheem ntawm cov ntaub ntawv, cov qhov ncauj qhov ntswg, cov qauv txheej, cov ntaub ntawv vector, daim ntawv vector, thiab lwm yam, Cia li nco ntsoov, cov ntaub ntawv no tsuas yog qhib rau Photoshop tab yuav qhib lawv.
Thaum twg los siv BMP
Siv BMP rau txhua yam ntawm cov duab bitmap (pixel-based). BMPs yog cov ntaub ntawv loj loj, tab sis tsis muaj kev poob zoo. BMP tsis muaj cov kev pab cuam zoo tshaj TIFF, tsuas yog koj tuaj yeem siv nws lub qhov rais wallpaper. Qhov tseeb, BMP yog ib qho ntawm cov duab cov duab tawm ntawm cov hnub nyoog thaum ntxov ntawm computer graphics thiab tsis tshua muaj, yog tias puas, siv hnub no. Qhov no piav qhia txog yog vim li cas nws yog hu ua "hom legacy".
Thaum twg thiaj siv PICT
PICT yog ib tug qub, Mac-tsuas bitmap hom siv rau Quickdraw rendering, Zoo ib yam li BMP rau Windows, PICT feem ntau tsis siv hnub no.
Thaum twg thiaj siv PNG
Siv PNG thaum koj xav tau cov ntaub ntawv me me thiab tsis muaj qhov tsis zoo. PNG cov ntaub ntawv feem ntau me dua cov duab TIFF. PNG kuj txhawb alpha transparency (cov npoo ntawm qhov muag) thiab tau tsim los ua qhov Web daim duab hloov tshiab rau GIF. Nco ntsoov tias yog tias koj xav kom khaws tag nrho cov ntaub ntawv , koj yuav tsum tau khaws koj cov ntaub ntawv PNG li PNG-24 thiab tsis PNG-8. PNG-8 no pab tau kom txo cov ntaub ntawv PNG cov ntaub ntawv thaum koj tsis tau transparency, tab sis nws muaj tib xim palette cov kev txwv raws li cov ntaub ntawv GIF .
PNG hom kuj tseem siv tau thaum tsim cov dluab rau iPhones thiab iPads. Tsuas paub cov duab tsis ua txhua yam zoo li png. Yog vim li cas png yog ib hom lossless, qab hau muaj tsawg heev yog muaj compression thov kom png duab uas ua rau cov ntaub ntawv loj dua loj dua lawv cov .jpg kwv tij txheeb ze.
Thaum twg thiaj siv GIF
Siv GIF rau qhov Web graphics yooj yooj yim-txog 256-xim. Cov ntaub ntawv GIF yeej ib txwm txo los 256 cim xim los yog tsawg dua thiab lawv ua me me, yoojyim graphics rau Web . GIF yog qhov zoo rau Web cov nyees khawm, kab kos los yog duab kos, kos duab zoo li daim duab, banners, thiab lub hau lus. GIF tseem siv rau me me, kev cog lus ntawm Web animations. GIF yuav tsum tsis tshua raug siv rau cov duab txawm tias muaj ib qhov kev hloov ntawm GIF duab thiab GIF Animations ua tsaug rau qhov kev sawv ntawm mobile thiab kev tshaj tawm.